Response to two cycles of divergent selection for grain yield under drought stress in four rice breeding populations

Venuprasad, R.; Cruz, Ma Teresa Sta; Amante, Modesto; Magbanua, R.; Kumar, Arvind; Atlin, G. N.

doi:10.1016/j.fcr.2008.02.004

Cited by 118 publications

(69 citation statements)

References 18 publications

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“…(Jongdee et al 2002;Pantuwan et al 2002) did not result in the expected genetic gains in DT. Some reports indicated that in well-managed trials, the heritability of grain yield under drought stress could be comparable to that under non-stress conditions, and direct selection against grain yield under stress is the most effective way to achieve increases in yield Venuprasad et al 2008). The slow progress in developing rice varieties for drought-prone areas is mainly due to the complex nature of DT mechanisms, including large QTL Â environment and QTL Â recipient genetic background interactions Mishra et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Drought-tolerance QTLs commonly detected in two sets of reciprocal introgression lines in rice

et al. 2014

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Abstract. Drought is one of the major abiotic stresses limiting rice (Oryza sativa L.) production. Quantitative trait loci (QTLs) for drought tolerance (DT) at the reproductive stage were identified with two sets of reciprocal introgression lines derived from Lemont Â Teqing. In total, 29 and 23 QTLs were identified in the Teqing and Lemont backgrounds, respectively, during the reproductive stage under drought and irrigated conditions for spikelet number per panicle, seed fertility, filled grain weight per panicle, plant height, and grain yield per plant. Most of these QTLs showed obvious differential expressions in response to drought stress. Another 21 QTLs were detected by the ratio of trait values under drought stress relative to the normal irrigation conditions in the two backgrounds. For 28 DT QTLs, the Teqing alleles at 23 loci had increased trait values and could improve DT under drought stress. Only five (17.9%) DT QTLs (QSnp1b, QSnp3a, QSnp11, QSf8, and QGyp2a) were consistently detected in the two backgrounds, clearly suggesting overwhelming genetic background effects on QTL detection for DT. Seven of the DT QTL regions identified were found to share the same genomic regions with previously reported DT-related genes. Introgressing or pyramiding of favourable alleles from Teqing at the validated QTLs (QSnp3a, QSnp11 and QGyp2a) into Lemont background may improve DT level of Lemont.

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Section: Introductionmentioning

confidence: 99%

Drought-tolerance QTLs commonly detected in two sets of reciprocal introgression lines in rice

et al. 2014

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“…The probability of these combined stresses damaging rice crops in the major ricegrowing regions in Southern and South-east Asia has been recently mapped (Wassmann et al 2009). The rice scientific community has intensified efforts to develop rice varieties capable of withstanding these adverse conditions (heat stress, Yoshida et al 1981;Jagadish et al 2010aJagadish et al , 2010bJagadish et al , 2011drought stress, Bernier et al 2007;Kumar et al 2008;Venuprasad et al 2008; cold stress, Andaya and Mackill 2003;Ji et al 2011) to sustain rice production under future adverse climates. Rice is extremely sensitive to these stresses, in particular, during the reproductive -gametogenesis and flowering stages -and exposure can result in increased spikelet sterility, which in turn, reduces grain yield.…”

Section: Introductionmentioning

confidence: 99%

A phenotypic marker for quantifying heat stress impact during microsporogenesis in rice (Oryza sativa L.)

Jagadish

Craufurd

Shi

et al. 2014

Functional Plant Biol.

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Abstract. Gametogenesis in rice (Oryza sativa L.), and particularly male gametogenesis, is a critical developmental stage affected by different abiotic stresses. Research on this stage is limited, as flowering stage has been the major focus for research to date. Our main objective was to identify a phenotypic marker for male gametogenesis and the duration of exposure needed to quantify the impact of heat stress at this stage. Spikelet size coinciding with microsporogenesis was identified using parafilm sectioning, and the panicle (spikelet) growth rate was established. The environmental stability of the marker was ascertained with different nitrogen (75 and 125 kg ha -1 ) and night temperature (22 C and 28 C) combinations under field conditions. A distance of -8 to -9 cm between the collar of the last fully opened leaf and the flag leaf collar, which was yet to emerge was identified as the environmentally stable phenotypic marker. Heat stress (38 C) imposed using the identified marker induced 8-63% spikelet sterility across seven genetically diverse rice genotypes. Identifying the right stage based on the marker information and imposing 6 consecutive days of heat stress ensures that >95% of the spikelets in a panicle are stressed spanning across the entire microsporogenesis stage.

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“…Such comparative analysis should target key morphological, physiological, anatomical, and agronomic traits throughout the crop growth cycle, as water deficit stress occurs at both early (vegetative stage) and late (reproductive stage) seasons in rice (Pandey et al, 2007). Extensive research efforts are currently ongoing to reduce the impact of water deficit stress during the reproductive stage in rice (Venuprasad et al, 2008;Verulkar et al, 2010;Vikram et al, 2011;Kumar et al, 2014) and in wheat (Olivares-Villegas et al, 2007;Lopes and Reynolds, 2010;Pinto et al, 2010). Therefore, our study focused on stress during the vegetative stage to identify key checkpoints that determine whole-plant responses of representative rice cultivars adapted to lowland, upland/aerobic, or water deficit conditions and of wheat cultivars with moderate to high water deficit tolerance.…”

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confidence: 99%

Does Morphological and Anatomical Plasticity during the Vegetative Stage Make Wheat More Tolerant of Water Deficit Stress Than Rice?

et al. 2015

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District of Columbia 20005 (P.S.B.)Water scarcity and the increasing severity of water deficit stress are major challenges to sustaining irrigated rice (Oryza sativa) production. Despite the technologies developed to reduce the water requirement, rice growth is seriously constrained under water deficit stress compared with other dryland cereals such as wheat (Triticum aestivum). We exposed rice cultivars with contrasting responses to water deficit stress and wheat cultivars well adapted to water-limited conditions to the same moisture stress during vegetative growth to unravel the whole-plant (shoot and root morphology) and organ/tissue (root anatomy) responses. Wheat cultivars followed a water-conserving strategy by reducing specific leaf area and developing thicker roots and moderate tillering. In contrast, rice 'IR64' and 'Apo' adopted a rapid water acquisition strategy through thinner roots under water deficit stress. Root diameter, stele and xylem diameter, and xylem number were more responsive and varied with different positions along the nodal root under water deficit stress in wheat, whereas they were relatively conserved in rice cultivars. Increased metaxylem diameter and lower metaxylem number near the root tips and exactly the opposite phenomena at the rootshoot junction facilitated the efficient use of available soil moisture in wheat. Tolerant rice 'Nagina 22' had an advantage in root morphological and anatomical attributes over cultivars IR64 and Apo but lacked plasticity, unlike wheat cultivars exposed to water deficit stress. The key traits determining the adaptation of wheat to dryland conditions have been summarized and discussed.Among cereals, rice (Oryza sativa) and wheat (Triticum aestivum) are the most important staple food crops, and they belong to the family Poaceae. These two cereals share a common ancestor and diverged about 65 million years ago (Sorrells et al., 2003). Rice eventually developed strong adaptation potential for fully flooded conditions across tropical to temperate environments, while wheat became well adapted to aerobic conditions mostly restricted to temperate environments. Rice, with a semiaquatic behavior, consumes about 30% of the total fresh water available for agricultural crops worldwide, which equates to a 2-to 3-fold higher consumption than other cereals such as wheat and maize (Zea mays; Peng et al., 2006). Despite a significantly lower water requirement, the potential yield of wheat in a favorable environment (9 tons ha 21 ) is comparable with the yield of fully flooded rice (9 tons ha 21 ) in the dry season at the International Rice Research Institute (IRRI; Fischer and Edmeades, 2010). Hence, rice records very low water productivity compared with wheat and other dryland cereals. Because of growing concerns about water scarcity and the increased frequency and magnitude of water deficit stress events under current and future climates, increasing or even sustaining rice yield under fully flooded conditions is highly challenging. To minimize the total water requ...

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Response to two cycles of divergent selection for grain yield under drought stress in four rice breeding populations

Cited by 118 publications

References 18 publications

Drought-tolerance QTLs commonly detected in two sets of reciprocal introgression lines in rice

Drought-tolerance QTLs commonly detected in two sets of reciprocal introgression lines in rice

A phenotypic marker for quantifying heat stress impact during microsporogenesis in rice (Oryza sativa L.)

Does Morphological and Anatomical Plasticity during the Vegetative Stage Make Wheat More Tolerant of Water Deficit Stress Than Rice?

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