Title: Enhancing rice productivity in water-stressed environments: perspectives for genetic improvement and management
Abstract: Drought Frontiers in Rice, pp. 233-257 (2009) No AccessEnhancing rice productivity in water-stressed environments: perspectives for genetic improvement and managementAnil Kumar Singh and Viswanathan ChinnusamyAnil Kumar SinghWater Technology Centre, Indian Agricultural Research Institute, New Delhi, India and Viswanathan ChinnusamyWater Technology Centre, Indian Agricultural Research Institute, New Delhi, Indiahttps://doi.org/10.1142/9789814280013_0013Cited by:2 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: The worldwide water shortage and uneven distribution of rainfall, made more erratic by global climate change, make the improvement of drought resistance especially important for rice, which is the major cereal crop of monsoon-based agriculture of Asia. The intensity, duration, and occurrence of water stress in relation to various phenological phases differ in the diverse ecosystems in which rice is cultivated. Therefore, the development of specific rice genotypes with enhanced resistance to soil moisture deficit that occurs in a target environment is necessary to enhance water productivity in rice. To maximize production under these conditions, there is a need to have a combination of options that include drought-resistant varieties as well as effective crop management strategies. Important mechanisms of drought resistance include drought avoidance via enhanced water uptake, reduced water loss, and enhanced water-use efficiency (WUE), and drought tolerance via osmotic adjustment, antioxidant capacity, and desiccation tolerance. Depending upon the nature of drought stress, plants may employ some or all of these mechanisms. Most research efforts in rice have been directed toward physiological dissection of complex drought resistance mechanisms into component traits, and mapping of the quantitative trait loci (QTLs) for these physiological traits. QTLs have been shown to contribute from 5% to 50% of the phenotypic variation in a single component trait. This suggests that pyramiding of QTLs by marker-assisted selection (MAS) is necessary for significant improvement of drought resistance. The lack of consistency of QTLs across population limits their immediate application in MAS. The identification of common QTLs across populations under near realistic field stress conditions with standard-stress-assays will enhance the pace of their use in MAS. Genetic engineering efforts are also being made to enhance the drought resistance of rice by overexpressing effector genes or transcriptional regulators. Transcriptome engineering is emerging as an important tool to combat abiotic stresses. Combination of metabolomics with expression QTLs (eQTLs) will increase the pace of our understanding of the molecular basis of drought resistance. Work done by us on aerobic rice was supported by CPWF-funded project on "Developing a System of Temperate and Tropical Aerobic Rice (STAR) in Asia.". FiguresReferencesRelatedDetailsCited By 2Effect of Drought Stress and Different Levels of Nitrogen and Potassium Fertilizers on the Accumulation of Osmolytes and Chlorophyll in Rice (Oryza sativa L.)Zahra Rabiei, Naser Mohammadian Roshan, Seyyed Mostafa Sadeghi, Ebrahim Amiri and Hamid Reza Doroudian24 February 2021 | Gesunde Pflanzen, Vol. 73, No. 3Where are We Standing and Where Should We Be Going? Gender and Climate Change Adaptation BehaviorImaneh Goli, Maryam Omidi Najafabadi and Farhad Lashgarara9 March 2020 | Journal of Agricultural and Environmental Ethics, Vol. 33, No. 2 Drought Frontiers in RiceMetrics History PDF download
Publication Year: 2009
Publication Date: 2009-07-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
Access and Citation
Cited By Count: 5
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