Phenotyping pearl millet for adaptation to drought

Vadez, V and Hash, C T and Bidinger, F R and Kholova, J (2012) Phenotyping pearl millet for adaptation to drought. Frontiers in Physiology, 3 (386). pp. 1-12. ISSN 1664-042X

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Abstract

Pearl millet is highly resilient to some of the driest areas of the world, like the Sahel area or fringes of the Thar desert in India. Despite this, there is a wealth of variation in pearl millet genotypes for their adaptation to drought and the object of this paper was to review some related work in the past 25 years to harness these capacities toward the breeding of better adapted cultivars. Work on short duration cultivars has been a major effort. Pearl millet has also some development plasticity thanks to a high tillering ability, which allows compensating for possible drought-related failure of the main culm under intermittent drought. The development of molecular tools for breeding has made great progress in the last 10–15 years and markers, maps, EST libraries, BACs are now available and a number of quantitative trait loci (QTLs) for different traits, including drought, have been identified. Most of the work on drought has focused on the drought tolerance index (DTI), an index that reflect the genetic differences in drought adaptation that are independent of flowering time and yield potential. The DTI is closely associated to the panicle harvest index (PNHI), a trait that relates to a better grain setting and grain filling capacity. Initial work on the DTI involved empirical breeding and selection based on PNHI. A QTL for PNHI has then been identified and introgressed by marker-assisted backcrossing. More recently, a thorough dissection of that QTL has been carried out and shows that high PNHI is related to the constitutive ability of tolerant lines to save water (lower leaf conductance and sensitivity of transpiration to high vapor pressure deficit) at a vegetative stage and use it for the grain filling period. However, there is no contribution of root traits in this QTL. Current work is taking place to map these water saving traits, understand their genetic interactions, and design ideotypes having specific genetic make-up toward adaptation to specific rainfall environments.

Item Type: Article
Divisions: RP-Dryland Cereals
CRP: UNSPECIFIED
Uncontrolled Keywords: Pearl Millet, Human Diet, Genetics, Genomic Resources, Drought resistance, Molecular breeding, Phenotyping, QTL, Breeding, Marker-assisted selection approach, Drought, Climate change
Subjects: Others > Cereals
Mandate crops > Millets > Pearl Millet
Others > Drylands Agriculture
Others > Drought
Others > Climate Change
Depositing User: Mr Ramesh K
Date Deposited: 26 Oct 2017 04:57
Last Modified: 26 Oct 2017 04:57
URI: http://oar.icrisat.org/id/eprint/10233
Official URL: http://dx.doi.org/10.3389/fphys.2012.00386
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: Dr Fran Bidinger, a key contributor to this chapter, passed away in April 2008. Fran dedicated his life to investigations on pearl millet, where he paved the way to current advances in drought research. Fran was an enthusiastic and dedicated scientist, always curious and keen to discuss science, and who did science until the end, insisting on delivering a course on drought phenotyping while unwell, on his last day at work. He will be remembered for his kindness, humility and scientific rigor. I feel privileged to have had him as a “father” in my initial years at ICRISAT, always patient to explain the unexplained.
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