Locating QTL for osmotic adjustment and dehydration tolerance in rice

Lilley, Julianne M.; Ludlow, M. M.; McCouch, Susan R.; O’Toole, J. C.

doi:10.1093/jxb/47.9.1427

Cited by 224 publications

(116 citation statements)

References 36 publications

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“…comm.). The identification of drought is a multidimensional stress, affecting plants molecular markers linked to OA capacity has been at various levels of their organization, breeding for investigated in wheat (Van Deynze et al, 1995) and drought tolerance necessarily implies focusing on in rice (Lilley et al, 1996). The use of molecular one or a few of the putative drought-tolerance markers has been found to increase the efficiency of mechanisms (Blum, 1996).…”

Section: Introductionmentioning

confidence: 99%

Looking for molecular and physiological markers of osmotic adjustment in sunflower

1997

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SUMMARYTwo families of Helianthus lines, T (low desiccation rate) and T+ (low desiccation rate), with contrasting osmotic adjustment (OA), obtained from a divergent selection programme, were compared for several morphological traits, ecophysiological parameters and molecular markers. The physiological analysis in a glasshouse experiment showed that the two families were identical in irrigated conditions except for a single trait, relative water loss (RWL: water loss rate of excised leaves). RWL could be used for these genotypes as a physiological marker of OA. A molecular anah^sis of the two contrasting lines, using differential screening of cDNA libraries, led to the isolation of three specific cDNAs, one of which, DRS26, showed high sequence homology with a mammalian amino-acid transporter. Subsequent RFLP and STS studies, using DRS26 and RAPD bulked analysis, enabled the identification of putative molecular markers of RWL and OA in T":T+ sunfiower.

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Section: Introductionmentioning

confidence: 99%

Looking for molecular and physiological markers of osmotic adjustment in sunflower

1997

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“…The recent development of high-density linkage maps has provided the tools for dissecting the genetic basis underlying complex traits, such as drought resistance, into individual components. Quantitative trait locus (QTL) mapping has been carried out in an attempt to determine the genetic basis of several traits that may be related to drought resistance, including OA (Lilley et al 1996;Zhang et al 1999Zhang et al , 2001Robin et al 2003), cellmembrane stability (Tripathy et al 2000), abscisic acid (ABA) content (Quarrie et al 1994(Quarrie et al , 1997, stomatal regulation , leaf water status, and root morphology (Champoux et al 1995;Ray et al 1996;Yadav et al 1997;Ali et al 2000;Courtois et al 2000;Zheng et al 2000;Zhang et al 2001;Kamoshita et al 2002;Price et al 2002). However, it is not clear how these attributes are related to the performance of the genotypes at the whole-plant level, and how they function to reduce the drought damage to fitness-and productivity-related traits.…”

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confidence: 99%

Genetic Basis of Drought Resistance at Reproductive Stage in Rice: Separation of Drought Tolerance From Drought Avoidance

et al. 2006

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Drought tolerance (DT) and drought avoidance (DA) are two major mechanisms in drought resistance of higher plants. In this study, the genetic bases of DTand DA at reproductive stage in rice were analyzed using a recombinant inbred line population from a cross between an indica lowland and a tropical japonica upland cultivar. The plants were grown individually in PVC pipes and two cycles of drought stress were applied to individual plants with unstressed plants as the control. A total of 21 traits measuring fitness, yield, and the root system were investigated. Little correlation of relative yield traits with potential yield, plant size, and root traits was detected, suggesting that DTand DA were well separated in the experiment. A genetic linkage map consisting of 245 SSR markers was constructed for mapping QTL for these traits. A total of 27 QTL were resolved for 7 traits of relative performance of fitness and yield, 36 QTL for 5 root traits under control, and 38 for 7 root traits under drought stress conditions, suggesting the complexity of the genetic bases of both DT and DA. Only a small portion of QTL for fitness-and yield-related traits overlapped with QTL for root traits, indicating that DT and DA had distinct genetic bases.

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“…The introduction of traits that contribute to drought avoidance or tolerance should improve resistance of rice to drought and this strategy therefore has considerable potential to increase rice production in areas prone to drought (Fukai and Cooper, 1995;Nguyen et al, 1997). For rice, considerable research effort has been devoted to mapping QTL for osmotic adjustment (Lilley et al, 1996), but only a few loci with major effects have been identified.…”

Section: Genes/qtl Underlying Drought Secondary Traitsmentioning

confidence: 99%

The effects of drought on rice cultivation in sub-Saharan Africa and its mitigation: A review

Noelle¹,

Rodrigue²,

Gnikoua³

2018

Afr. J. Agric. Res.

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Drought is the primary cause of yield loss in agriculture throughout the world, and is currently the most common reason for global food shortages. Three-quarter of the most severe droughts in the last ten years have been in Africa, the continent which already has the lowest level of crop production and drought adaptive capacity. The increased incidences of drought and erratic rainfall have thrown small holder farmers in Africa into deep poverty, hunger and malnutrition. In this paper, the drought situation in sub-Saharan Africa and its impact on rice production was reviewed. Rice is particularly vulnerable to droughts as it has higher water requirement as compared to other crops. The review has also highlighted physiological and molecular plant responses to drought, with special focus on effects of drought stress on rice grain yield and other related-traits. With climate change predicted to exacerbate the problem of water security in Africa, it is imperative that we develop robust, well-planned and informed strategies to mitigate against drought. Various drought mitigation strategies including breeding for drought tolerance and water harvesting and conservation techniques are also outlined. In order to adapt to drought, there is need for a broad based approach that includes development of appropriate policies, putting in place necessary water related investments and institutions as well as capacity building at various levels.

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Locating QTL for osmotic adjustment and dehydration tolerance in rice

Cited by 224 publications

References 36 publications

Looking for molecular and physiological markers of osmotic adjustment in sunflower

Looking for molecular and physiological markers of osmotic adjustment in sunflower

Genetic Basis of Drought Resistance at Reproductive Stage in Rice: Separation of Drought Tolerance From Drought Avoidance

The effects of drought on rice cultivation in sub-Saharan Africa and its mitigation: A review

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