Enhancing drought tolerance in C4 crops

Lopes, M.S. and Araus, J.L. and van Heerden, P.D.R. and Foyer, C.H. (2011) Enhancing drought tolerance in C4 crops. Journal of Experimental Botany, 62 (9). pp. 3135-3153.

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Adaptation to abiotic stresses is a quantitative trait controlled by many different genes. Enhancing the tolerance of crop plants to abiotic stresses such as drought has therefore proved to be somewhat elusive in terms of plant breeding. While many C4 species have significant agronomic importance, most of the research effort on improving drought tolerance has focused on maize. Ideally, drought tolerance has to be achieved without penalties in yield potential. Possibilities for success in this regard are highlighted by studies on maize hybrids performed over the last 70 years that have demonstrated that yield potential and enhanced stress tolerance are associated traits. However, while our understanding of the molecular mechanisms that enable plants to tolerate drought has increased considerably in recent years, there have been relatively few applications of DNA marker technologies in practical C4 breeding programmes for improved stress tolerance. Moreover, until recently, targeted approaches to drought tolerance have concentrated largely on shoot parameters, particularly those associated with photosynthesis and stay green phenotypes, rather than on root traits such as soil moisture capture for transpiration, root architecture, and improvement of effective use of water. These root traits are now increasingly considered as important targets for yield improvement in C4 plants under drought stress. Similarly, the molecular mechanisms underpinning heterosis have considerable potential for exploitation in enhancing drought stress tolerance. While current evidence points to the crucial importance of root traits in drought tolerance in C4 plants, shoot traits may also be important in maintaining high yields during drought

Item Type: Article
Uncontrolled Keywords: Effective use of water, heterosis, maize, photosynthesis, root mass at depth, stay green, sugarcane
Author Affiliation: International Maize and Wheat Improvement (CIMMYT), Km. 45, Carretera Mexico-Veracruz, El Batan, Texcoco, CP 56130 Mexico
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Maize
Depositing User: Ms K Syamalamba
Date Deposited: 22 Sep 2011 05:11
Last Modified: 22 Sep 2011 05:11
Official URL: http://jxb.oxfordjournals.org/content/62/9/3135.ab...
URI: http://eprints.icrisat.ac.in/id/eprint/2684

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