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Pearl millet genome reveals how this cereal survives temperatures over 42 degrees Celsius
Publish Date: 2017-09-18

18 September 2017, Rising temperatures and frequency of extreme climate events like heat waves in many parts of the world will lead to a drop in major staple crop production. Now, the decoding and sequencing of the pearl millet genome by a global team of 65 scientists from 34 research institutions has revealed critical coping strategies. The analysis of genetic variability among a thousand pearl millet lines has led to a better understanding of the ability of this dryland cereal to survive soaring temperatures (over 42oC) and its exceptional drought tolerance. This discovery published in Nature Biotechnology may also help develop climate adaptation strategies in other important cereal crops.

This research co-led by the International Crops Research Institute for Semi-Arid Tropics (ICRISAT), India, BGI-Shenzhen, BGI-Qingdao, China National GeneBank(CNGB), China and the French National Research Institute for Sustainable Development (IRD), used the latest innovations in DNA sequencing and analysis to identify new genetic tools like molecular markers related to drought and heat tolerance, as well as other important traits (better nutrition profile, pest resistance). This will catalyze breeding efforts to improve this crucial staple food for millions of people in arid and semi-arid Africa and Asia in particular. This project is supported in parts by the Bill and Melinda Gates Foundation.

Pearl millet is a nutritious drylands cereal, rich in protein, fiber and essential micronutrients like iron, zinc and folate. Nutrition studies have shown that this cereal has the potential to fight iron deficiency, the most widespread micronutrient deficiency and major cause of anemia, affecting health and development of a third of global population. Pearl millet is grown on about 27 million hectares worldwide and is a daily food for more than 90 million people, among the most vulnerable in arid and semi-arid Africa and Asia. It is also an important source of fodder for millions of farms. However, pearl millet yields have remained low over the last six decades, as this cereal is mainly grown in poor soil conditions without irrigation, minimal and no fertilizer and other agricultural inputs.

Investment in genetic research for this smallholder crop has been inadequate and breeders had limited genetic information to develop high yielding superior varieties and hybrids that respond to farmers’ constraints. This pearl millet genome research has led to a better understanding of its genetic variability, and researchers have identified candidate genes of very important traits, such as heat tolerance, or resistance to downy mildew, a very damaging millet disease.

For instance, pearl millet has an extraordinary capacity to resist baking heat. Professor Rajeev Varshney, ICRISAT, who coordinated the Pearl Millet Genome Sequencing Consortium said, “Most cereals like rice or maize cannot support temperatures over 30 to maximum 35 degrees Celsius when they start forming their grain, whereas pearl millet will fill its grain in air temperatures of up to 42 degrees.” He added, “We have found that compared to other cereals like wheat, rice or maize, pearl millet has a more diverse repertoire of genes for natural wax proteins, which act as thermal protection for the plant.”

Such heat resistance is crucial as climate experts forecast further heat waves in years to come. With the new biotechnology methods, we could foresee the transfer of such heat and drought tolerance to other important food cereals in a near future.

Dr David Bergvinson, Director General of ICRISAT, explained why this genome discovery is key in our changing climate. “This research will lead to delivery of high yields of pearl millet in farmer fields in the marginal environments in Africa and Asia. Identifying better genes for heat tolerance in pearl millet can also help other crops like wheat, rice and maize become more climate change ready, showing the importance of investing in so called ‘orphan’ or neglected crops.”

Professor M S Swaminathan, Father of the Indian Green Revolution, said “For years, I have advocated for climate smart and nutritious pearl millet, which is now part of the food basket of Indian’s public distribution system. Unlocking the DNA data of this climate smart nutri-cereal will catalyze new pearl millet varieties to help in the drive for more productive, nutrition-sensitive and resilient farming.”

Dr. Xun Xu, director of BGI research and executive director of CNGB, said in a statement, “Pearl millet is a very important crop in the Indo-Africa region, so this project has a positive effect on its breeding research and the improvement of agronomic traits. Not only that, we can extended our research to other local crops, which will support other crops’ cultivation and development in India and Africa.”

The faster development of improved pearl millet varieties that can grow despite heat and drought, and still yield good harvests and income for smallholder farmers will help communities to adapt to climate change and be food and nutrition secure.

Further Reading:

Pearl millet genome sequence provides a resource to improve agronomic traits in arid environments