Genes/QTLs affecting flood tolerance in rice

Sripongpangkul, K.; Posa, G. B. T.; Senadhira, D.; Brar, D. S.; Huang, Ning; Khush, G. S.; Li, Z. K.

doi:10.1007/s001220051582

Cited by 70 publications

(35 citation statements)

References 1 publication

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“…Hence, it is possible to consider that dw3 is one of the alleles at qLEI12 and/or qRIE12. In the almost the same region of qRIE1, Sripongpangkul et al (2000) detected the QTL controlling internode elongation in gradual water level rising conditions.…”

Section: Discussionmentioning

confidence: 91%

Mapping of QTLs for floating ability in rice

et al. 2008

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Deepwater rice (floating rice) can survive under flooded conditions because of their floating ability. We conducted genetic analysis to elucidate the genetic control of floating ability by using an F 2 and BC 3 F 2 populations derived from a cross between deepwater and non-deepwater rice varieties. Internode elongation is the most important trait responsible for this adaptation, and is characterized by two factors: timing of the initiation of elongation and the rate of elongation. The position of the lowest elongated internode (LEI) and the rate of internode elongation (RIE) were used to measure floating ability. Two QTLs for LEI were detected on chromosomes 3 (qLEI3) and 12 (qLEI12). For RIE, two QTLs were detected on chromosomes 1 (qRIE1) and 12 (qRIE12). We confirmed the genetic effects and map positions of qLEI3, qLEI12 and qRIE12 by using BC 3 F 2 populations. Characterization of near-isogenic lines of qLEI3, qLEI12 and qRIE12 revealed that the LEI and RIE are at least partly controlled by different genetic pathways. Observation of near-isogenic lines suggested that the introgressed segment of qLEI12 and qRIE12 of chromosome 12 affected the deepwaterresponsive elongation.

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Section: Discussionmentioning

confidence: 91%

Mapping of QTLs for floating ability in rice

et al. 2008

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“…Our findings of relatively few QTL that are significantly associated with flood tolerance are consistent with studies involving rice cultivars. In Oryza, the ability to survive in completely submerged conditions for extended periods of time is a trait that is controlled by one or a few loci of major effect and by some minor-effect modifier loci (Mohanty and Khush 1985;Sinha and Saran 1988;Haque et al 1989;Sripongpangkul et al 2000;Toojinda et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Detecting Adaptive Trait Introgression BetweenIris fulvaandI. brevicaulisin Highly Selective Field Conditions

2006

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The idea that natural hybridization has served as an important force in evolutionary and adaptive diversification has gained considerable momentum in recent years. By combining genome analyses with a highly selective field experiment, we provide evidence for adaptive trait introgression between two naturally hybridizing Louisiana Iris species, flood-tolerant Iris fulva and dry-adapted I. brevicaulis. We planted reciprocal backcross (BC 1 ) hybrids along with pure-species plants into natural settings that, due to a flooding event, favored I. fulva. As expected, I. fulva plants survived at much higher rates than I. brevicaulis plants. Backcross hybrids toward I. fulva (BCIF) also survived at significantly higher rates than the reciprocal backcross toward I. brevicaulis (BCIB). Survivorship of BCIB hybrids was strongly influenced by the presence of a number of introgressed I. fulva alleles located throughout the genome, while survivorship in the reciprocal BCIF hybrids was heavily influenced by two epistatically acting QTL of opposite effects. These results demonstrate the potential for adaptive trait introgression between these two species and may help to explain patterns of genetic variation observed in naturally occurring hybrid zones.

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“…A mapping population had been developed at IRRI for the purpose of identifying QTLs for flooding tolerance (Sripongpangkul et al, 2000). The parental lines were two indica cultivars, IR74 and Jalmagna.…”

Section: Plant Materialsmentioning

confidence: 99%

“…QTL mapping was based on the linkage map of 142 AFLP and two gene markers constructed by Sripongpangkul et al (2000). The 144 markers covered a total length of 2,339.9 cM, with an average interval of 17.9 cM between markers.…”

Section: Qtl Mappingmentioning

confidence: 99%

Effects of Zinc Deficiency on Rice Growth and Genetic Factors Contributing to Tolerance

Wissuwa

Ismail²,

Yanagihara³

2006

Plant Physiology

190

126

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Zinc (Zn) deficiency is the most widespread micronutrient disorder in rice (Oryza sativa), but efforts to develop cultivars with improved tolerance have been hampered by insufficient understanding of genetic factors contributing to tolerance. The objective of this paper was to examine alternative evaluation methods and to identify the most informative traits that would provide realistic information for rice breeders and to map quantitative trait loci (QTLs) associated with tolerance. Screening experiments in low-Zn nutrient solution and in a Zn-deficient field did not produce similar tolerance rankings in a set of segregating lines, which suggested that rhizosphere effects were of greater importance for lowland rice than internal Zn efficiency. The most severe symptom in the field was high plant mortality. The occurrence of leaf bronzing, usually regarded as indicative of susceptibility, did not necessarily concur with high plant mortality, which implied that both were under independent genetic control. The QTL mapping experiment conducted in the field with a population derived from a cross of IR74 (intolerant) with Jalmagna (tolerant) largely confirmed this. Four QTLs associated with plant mortality were detected, and only one of those colocalized with one of the four QTLs detected for leaf bronzing. The two most influential QTLs for plant mortality were detected on chromosomes 2 and 12. They explained 16.6% and 24.2% of the variation, and alleles of the tolerant donor parent Jalmagna reduced mortality by 16.6% and 14.8%, respectively. QTLs for plant mortality acted in a purely additive manner, whereas digenic epistatic interactions were important for leaf bronzing.

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Genes/QTLs affecting flood tolerance in rice

Cited by 70 publications

References 1 publication

Mapping of QTLs for floating ability in rice

Mapping of QTLs for floating ability in rice

Detecting Adaptive Trait Introgression BetweenIris fulvaandI. brevicaulisin Highly Selective Field Conditions

Effects of Zinc Deficiency on Rice Growth and Genetic Factors Contributing to Tolerance

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