Professor Kathy Willis, director of science at the Royal Botanic Gardens Kew, with the final episodes of her new history of our changing relationship with plants

Kathy Willis examines how the technology that helped map whole genomes in plants and animals was to revolutionise the classification of flowering plants; the evolution of our rainforests as revealed by DNA fingerprinting; plants as essential regulators of our planet's atmospheric carbon and water cycles; how green spaces and ecosystems have a positive effect on our health and well being; the future role of plants as providers of food to feed the planet's growing population.

Producer Adrian Washbourne.

Prof Kathy Willis, Director of Science at Royal Botanic Gardens Kew, with an omnibus edition of her history of our changing relationship with plants from the early 20th century.

She examines new insights into plant hormones during the first few decades of the 20th century, the manipulation of which underpinned the perceived success of the so called Green Revolution; unlocking biodiversity through the creation of plant flora encyclopaedias - and their influence in conservation; the surprising benefits to emerge from the devastation wreaked by the great storm of 1987; what can be gained by preserving the diversity of plants through seed banking; the legacy of Arabidopsis - the first plant to have its entire genome sequenced.

Producer Adrian Washbourne.

Prof Kathy Willis, Director of Science at the Royal Botanic Garden, Kew, with the omnibus edition of her history of our changing relationship with plants during the early 20th century.

Kathy Willis examines how the complete picture of photosynthesis led to new opportunities to manipulate plant growth; the ability of plants to exhibit multiple forms that shed light on why flowering plants evolved so quickly; the legacy of tree diseases during the 20th century; the hunt for wild ancestors of our domestic crops in order to maintain resilience within our future food supplies; and botanical medicines and the hunt for new medicinal cocktails at home and abroad.

Producer Adrian Washbourne.

Prof Kathy Willis, Director of Science at the Royal Botanic Garden, Kew, with the omnibus edition of her history of our changing relationship with plants during the 19th century.

She examines the race to tame and culture the prized Amazonian water lily which played out in glare of the nations' new greenhouses; the smuggling of rubber seeds out of Brazil to establish a rubber industry in the British colonies; how a growing passion for orchids opened a new episode in cultivating exotic plants for all; the threat posed by the rise of invasive species; and how a new precision in understanding the behaviour of hybrids led to the birth of modern genetics at the close of the 19th century.

Producer Adrian Washbourne.

The first of five omnibus editions of Prof Kathy Willis' timely new history of our changing relationship with plants

From the birth of modern plant classification, harnessing botany and imperial progress in furthering Britain's destiny as the major civilising power in the world , to establishing the laws of what grows where and why, Professor Kathy Willis, Director of Science at the Royal Botanic Gardens Kew, examines new attitudes to plants during the 18th and early 19th century.

From plants as tools to exploit to flowers as objects of beauty, Kathy Willis draws upon Kew's archives and its herbarium collection of pressed plants that was to play a pivotal role in establishing insights into plant relationships and their distribution around the world. It was to help establish the first accurate maps of the world's flora by the mid 19th century.

Producer: Adrian Washbourne

Presenter: KATHY WILLIS is director of science at Royal Botanic Gardens at Kew. She is also professor of long-term ecology and a fellow of Merton College, both at Oxford University. Winner of several awards, she has spent over 20 years researching and teaching biodiversity and conservation at Oxford and Cambridge.

Prof Kathy Willis concludes her major new history series by asking how much plant biodiversity is worth, and examines new research into securing the future of our staple crops.

Understanding the distribution, diversity and potential of plants for food, lay at the heart of the 18th century botanical impresario Joseph Banks' vision to "improve Britain's estates of the world". To secure future resilience of crops in today's world there's a growing need to conserve the closest wild relatives of our staple crops.

Kathy Willis discovers, given climatic threats to some of our most substantial crops such as coffee - for which the industry currently depends on a single species, the economic value of wild relatives of today's domestic crops is considerable.

And as we hear, some important future crops are still to be found from previously overlooked plants.

With contributions from Richard Thompson, Business valuations partner at Price-Waterhouse Cooper; historian Jim Endersby; head of coffee research at Kew, Aaron Davis; Kew's head of yams Paul Wilkin.

Producer Adrian Washbourne

Music for the series was composed by Mark Russell.

Prof. Kathy Willis examines the different kinds of spiritual, physical and intellectual links that we have with the landscape and their diverse ecosystems and the extent to which they contribute to our health and well being.

As well as providing a source of inspiration and recreation there's plenty of anecdotal evidence suggesting that green spaces can make a positive contribution to our health, but what kinds of landscapes are of greatest benefit?

Kathy Willis assesses the some of the latest research assessing physiological and psychological benefits that ecosystems can provide from manicured botanical gardens to wild open countryside

With contributions from Richard Barley, director of horticulture Kew Gardens; Rachel Bragg researcher in Green Care at Essex University, Shonil Bhagwat environmental geographer at the OU, and historian Jim Endersby

Producer Adrian Washbourne.

In 2005 a landmark study was published which changed the political landscape for conservation, probably for ever. Rather than viewing biodiversity as something to be conserved for conservation's sake, the Millennium Ecosystem Assessment started to assess the contributions that biodiversity makes to human livelihoods and well-being. These include regulating services ( such as modulating climate), cultural services (the spiritual, educational and recreational value) and provisioning services (the biodiversity that provides food, fresh water, and fuel).

Professor Kathy Willis examines the first of these new approaches to biodiversity conservation by firstly assessing the role plants play in regulating our atmospheric carbon dioxide. She talks to Yadvinder Mahli on the importance of trees in drawing down and capturing carbon and on new understandings in where the effect is most apparent on our planet.

But how we view ecosystems at the landscape scale is equally important if plants are to flourish in this capacity and recent reduction in vital plant pollination services are proving to be poorly understood .

But as Kathy Willis hears from chemistry ecologist Phil Stevenson, one of several approaches in improving the memory of bees that account for 30% of plant pollination could have a dramatic and significant effect in securing this vital function.

Producer: Adrian Washbourne.

Palms provide many basic necessities and are collectively one of the most important plants families after grasses and legumes. In 2007 and extraordinary new find came to light when a French plantation manager in Madagascar, came across a new species of palm tree 18metres high and with a 5m leaf span - visible from Google Earth. The palm family continues to grow at a rapid rate As new species make themselves known to science it's becoming vital to appreciate their potential uses. Discoveries are also helping to shed light on the "palm tree of life".

Professor Kathy Willis meets Head of Palms at Kew, Bill Baker, to examine how new technology such as DNA sequencing has come to provide an amazing evolutionary record of palms over timescales greater than the fossil record can offer. Crucially, it's beginning to show when the diversification of palms began. In doing so, the genetic analysis is beginning to rewrite our understanding of the origins of the rainforest and looking to favour Alfred Russel Wallace's overlooked "museum model " of the evolution of ancient rainforests.

With additional contributions from head of the Kew Palm House Scott Taylor, and former Head of Palms at Kew, John Dransfield

Producer Adrian Washbourne.

The new science of DNA sequencing during the 1990's would not only lead to the mapping of complete human and plant genomes but it was to also revolutionise the classification for flowering plants. For the first time, rather than the 200 year old tradition of classifying plants just on their shape and structures, scientists could begin to infer how closely plants were related by examining the differences in DNA between different families and species.

Kathy Willis examines the story of how new connections between plants were uncovered that appearance alone could never have suggested. She talks to Kew's Mark Chase, leader of the Angiosperm Plant Phylogeny Group - an international group of scientists who pioneered this work, and hears how this molecular analysis was to rewrite some of the many assumptions that we've made about close relationships within and between plant families.

Kathy also hears from plant morphologist Paula Rudell on how detailed pollen analysis was to back up some of the controversial findings that this work was suggesting The practical implications of this new way of classifying are huge and could open the way to identifying new plants for medicinal use, and help accurately determine the ability of plants to withstand future environmental change.

With additional contributions from Kew taxonomist Gwil Lewis and historian Jim Endersby

Producer Adrian Washbourne.

At a glance, Arabidopsis thaliana (Mouse ear cress) looks little more than a tiny flowering weed. But this nondescript plant became a Rosetta stone for understanding the molecular processes underpinning many plant traits when in 2000 it became the first plant to have its genome fully sequenced.

Professor Kathy Willis hears how Arabidopsis bagged the role in plant genetics research similar to that played by mice and fruit flies in animal research, and how amidst arguments for and against the technique of modification, it became a key to introducing new characteristics in a quicker and more targeted way than traditional plant breeding.

The overall size of the Arabidopsis genome however, is not typical of many plants. We hear how a new understanding of the surprisingly diverse range of genome sizes within the plant kingdom is shedding light on the speed of a plant's ability to reproduce and adapt in changing conditions, which could play a fundamental role in decoding the patterns of plant distribution we see around the world.

With contributions from historian Jim Endersby, plant scientist Prof Liam Dolan and cytogeneticist Ilia Leitch.

Producer Adrian Washbourne.

By the end of the 20th century, concerns raised in the 1992 Rio Earth Summit about the fate of wild plants and their ecosystems meant that conservation in the field now needed to be complemented by methods away from a plant's natural habitat.

Professor Kathy Willis pays a visit to the underground vaults of Kew's Millennium Seed Bank Partnership (MSBP), one in a network of 1300 seed banks around the world - and one of the main "ex situ" methods for conserving plant genetic material.

Knowing the longevity and quality of seeds is vital if they're to be put to good use in the real world. We hear a testament to the length of seed survival as head of the MSBP reveals recent success in germinating a 200 year old packet of seeds collected from the Dutch East India Company Gardens in South Africa. And Kathy Willis discovers how research into variable climates during crop cycles on seed quality is providing new leads into which varieties of crops seeds to store, to ensure future sustainable food supplies.

With contributions from seed morphologist Wolfgang Stuppy, MSB seed manager Janet Terry, Paul Smith head of the MSBP, and Hugh Pritchard head of MSBP seed conservation.

Producer Adrian Washbourne.

During the early hours of October 16th 1987, hurricane force winds ripped through southern England recording gusts of 110 mph. In just a few hours 15 million trees across the country were felled. Dawn revealed over 700 of Kew's trees sprawled on their sides, their root systems spread in the cool calm air after the storm.

Kathy Willis explores how one Kew oak tree - the Turner Oak - that didn't fall, helped transform the understanding of tree planting, arboreal care and provided insights into why trees stay upright.

She takes a walk with arborealist Tony Kirkham around Kew Gardens to learn how this natural clearout gave a once in a generation chance to rethink Kew's arboreal canvas. It also created an opportunity for the first-ever comprehensive tree root survey, which has since transformed our approach to tree planting and long-term care that's now finding its way into horticultural practices today.

Producer: Adrian Washbourne

In 1947 an ambitious project began to survey and catalogue the biodiversity of plants in East Africa. It was to take 60 years and turned out to be one of the largest regional "floras" ever assembled, involving 135 botanists from 21 countries amassing a host of new species to science.

Professor Kathy Willis examines the deceptive simplicity of creating Floras - books in which plants are catalogued, described and often lavishly illustrated. She explores how they're proving powerful tools for unlocking the range of newly discovered species for plant enthusiasts and conservationists.

And she unlocks the secrets of the rigorous art of botanical illustration, a tradition that goes back as far as when the botanical impresario Sir Joseph Banks first employed an illustrator on board the Endeavour. Kathy Willis discovers why this discipline is unlikely to ever be superseded by photography.

With contributions from Henke Beentje, former editor of Flora of Tropical East Africa, senior botanist Iain Darbyshire, Quentin Luke of National Museum of Kenya and illustrator Lucy Smith

Producer: Adrian Washbourne

When in 1934 botanist Kenneth Thimann isolated the plant hormone auxin, he put an end to one of the great botanical mysteries - how plants move and respond to their surroundings. For decades plant scientists had been mystified as to how plants, without any apparent nervous system, bent towards light, flowered at the right time of year, or grew away from other plants.

Professor Kathy Willis hears from historian Jim Endersby on how the discovery of plant hormones was the culmination of a journey that had involved Charles Darwin and a series of probing experiments published in his book "The Power of Movement in Plants". They discuss how new technologies enabled successful isolation of what we now have come to recognise as a suite of hormones regulating a whole series of plant responses from stem growth to fruiting.

We hear how another hormone during the 1950s went on to steal the limelight - gibberellin whose discovery owes much to Japanese rice crops that grew so tall they would simply fall over, rendering them useless. The race to harness the power of gibberellin would lead to dwarf varieties of key crops that transformed global production in what became known as the Green Revolution.

Professor Nick Harberd, a plant geneticist at Oxford University, has been researching the molecular basis of plants' response to this powerful hormone and he sheds light on developing crops suitable for harsher environments in future.

Producer: Adrian Washbourne

In 1947 Sir Robert Robinson received the Nobel prize for Chemistry "in recognition of his investigations of plant products of biological importance, especially the alkaloids". This powerful family of plant chemicals was proving a potent medical tool.

Professor Kathy Willis traces the natural role of alkaloids in plants and the first attempts to isolate one of the best know - quinine, from chinchona bark growing in the Andes. This development gave rise to the emergence of a new kind of laboratory scientist equally able to handle botanical and chemical data. As Mark Nesbitt, Keeper of Kew's Economic Botany Collection explains, this was to eliminate the chance and guesswork in identifying "good" plants from "bad".

Professor Monique Simmons of Kew's Jodrell Laboratory, assesses why chemicals from the plant kingdom are still needed in the fight against some of our most challenging diseases, from breast cancer to cardiovascular disease, and how making the nuanced connections between plant species is central to success in this field.

Producer Adrian Washbourne.

Agriculture tends to favour the best food varieties but this is often a trade off with beneficial traits such as resistance to disease or tolerance to drought. During the 1920s the Russian botanist Nikolai Vavilov, having witnessed famine on a large scale, became increasingly concerned about the potential loss of locally adapted varieties and spent his life studying crop plants in their wild habitats.

Professor Kathy Willis examines Vavilov's pioneering work and his search for pools of genetic variability - so called "centres of origin" amongst the wild relatives of our domesticated crops that could help sustain future plant breeding for human use.

Vavilov's story has a tragic end but, as we hear, his legacy lives on in seedbanks such as Kew's Millennium Seedbank at Wakehurst Place whose Crop Wild Relatives Project is collecting and assessing new potential amongst the original progenitors of our domestic crops.

With contributions from archaeobotanist Dorian Fuller, Kew's curator of economic botany Mark Nesbitt, Crop Wild Relatives Project coordinator Ruth Eastwood, and head of the Millennium Seedbank Paul Smith.

Producer Adrian Washbourne.

By the end of the First World War the mysterious sudden death of elms was a common sight across Belgium and the Netherlands. Dutch researchers managed to elucidate the real culprit amidst rumours of drought or wartime gas poisoning. It was a fungus thought to originate from America, carried by a beetle and the disease rather unfairly gained its name Dutch elm disease. Diagnosis produced no cure and it soon advanced across the channel to Britain.

Professor Kathy Willis talks to the head of Kew's arboretum, Tony Kirkham, on the disease's impact amidst complacency, and how the emergence of a vigorous new fungal strain was to completely transform the landscape during its peak in the 1970's.

Now that the principle replacement for lost elms, ash, itself has fallen victim to the latest disease to hitch a ride on incoming nursery stock, Paul Smith, Head of Kew's Millennium Seed Bank, explains why this new disease could be easier to control.

Producer Adrian Washbourne.

In 1903 a cluster of evening primrose in an abandoned potato field outside the Dutch town of Hilversum caught the eye of German botanist Hugo de Vries. Its huge blooms and large leaves appeared to suggest the sudden development of a new species. Around the same time in Kew Gardens a mysterious primula hybrid appeared. The new discipline of plant genetics soon revealed that this curious trick was being driven by multiplication of chromosomes inside the plant cell nucleus.

Professor Kathy Willis examines this phenomenon - known as polyploidy ( "multiple forms") - and how insights into this peculiarity can contribute to the evolutionary success of plants. It may also hold the answer to one of the botanical world's greatest mysteries - why so soon after appearing in the fossil record did the flowering plants suddenly explode into the bewildering range of species we see today.

With contributions from historian Jim Endersby, Keeper of Kew's Jodrell Lab Mark Chase, and Jodrell Laboratory geneticist Illia Leitch.

Producer Adrian Washbourne.

The Nobel prize for Chemistry was awarded to German scientist Richard Willstatter in 1915 for his analysis of the green plant pigment chlorophyll. It marked a significant moment in the long history of piecing together the many elements that contribute to photosynthesis - the process by which plants draw in carbon dioxide from the atmosphere and together with light and water can generate their own glucose and release oxygen back into the air. The limits of this process were now clear

Kathy Willis hears from historian Jim Endersby about defining moments in photosynthesis' long history and from Kew's Head of Conservation Biotechnology about how artificially elevating levels of carbon dioxide in the air,a technique long developed by horticulturists to produce bigger fruit and vegetable crops, is now having dramatic effects on successful reintroduction of cultivated endangered plants back into the wild.

And as scientists understand the different methods that plants use to photosynthesise, Kathy Willis hears from Oxford plant scientist Jane Langdale who's part of a network of international scientists who are attempting to mend a fundamental flaw in the process of photosynthesis which could improve future rice yields by 50%

Producer Adrian Washbourne.