Drought susceptibility of modern rice varieties: an effect of linkage of drought tolerance with undesirable traits
Green Revolution (GR) rice varieties are high yielding but typically drought sensitive. This is partly due to the tight linkage between the loci governing plant height and drought tolerance. This linkage is illustrated here through characterization of qDTY1.1, a QTL for grain yield under drought that co-segregates with the GR gene sd1 for semi-dwarf plant height. We report that the loss of the qDTY1.1 allele during the GR was due to its tight linkage in repulsion with the sd1 allele. Other drought-yield QTLs (qDTY) also showed tight linkage with traits rejected in GR varieties. Genetic diversity analysis for 11 different qDTY regions grouped GR varieties separately from traditional drought-tolerant varieties, and showed lower frequency of drought tolerance alleles. The increased understanding and breaking of the linkage between drought tolerance and undesirable traits has led to the development of high-yielding drought-tolerant dwarf lines with positive qDTY alleles and provides new hope for extending the benefits of the GR to drought-prone rice-growing regions.
Auteurs principaux: | Vikram, P., Mallikarjuna Swamy, B.P., Dixit, S., Singh, R., Miro, B., Kohli, A., Henry, A., Singh, N.K., Arvind Kumar |
---|---|
Format: | Article biblioteca |
Langue: | English |
Publié: |
Nature Publishing
2015
|
Sujets: | AGRICULTURAL SCIENCES AND BIOTECHNOLOGY, Rice Varieties, Drought Sensitive, GREEN REVOLUTION, GENETICS, DROUGHT TOLERANCE, QUANTITATIVE TRAIT LOCI, ALLELES, CHROMOSOME MAPPING, GENETIC DIVERSITY, |
Accès en ligne: | https://hdl.handle.net/10883/19707 |
Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
Documents similaires
-
Drought - inducible genes and differentially expressed sequence tags associated with components of drought tolerance in durum wheat
par: Diab, A.A., et autres
Publié: (2008) -
Genetic architecture of delayed senescence, biomass, and grain yield under drought stress in cowpea
par: Muchero, W., et autres
Publié: (2013) -
Multiple QTLs linked to agro-morphological and physiological traits related to drought tolerance in potato
par: Khan, M.A., et autres
Publié: (2015-10) -
Positive interactions of major-effect QTLs with genetic background that enhances rice yield under drought
par: Sandhu, N., et autres
Publié: (2018) -
Metabolome-based genome-wide association study of maize kernel leads to novel biochemical insights
par: Weiwei Wen, et autres
Publié: (2014)