Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering

Azhiri-Sigari, T.; Yamauchi, Akira; Kamoshita, Akihiko; Wade, Len J.

doi:10.1626/pps.3.180

Cited by 97 publications

(47 citation statements)

References 16 publications

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“…In this study, lines were found to adapt to changing soil conditions in different ways as drought progressed. Consistent with the results of Azhiri-Sigari et al (2000) and Kamoshita et al (2000) in the greenhouse, IR58821 and CT9993 were more able to develop roots at depth, while IR62266 was slower in extracting water from depth but favored osmotic adjustment. Similar results were obtained in controlled conditions by Babu et al (2001).…”

supporting

confidence: 82%

“…The percentage of root axes that penetrated the artificial hardpan was greater in CT9993 than in IR62266 under both well-watered (66% and 53%, respectively) and drought treatments (56% and 47%), respectively. The greater inherent ability of CT9993 to elongate roots at depth was also reported by Azhiri-Sigari et al (2000), and was consistent with field studies (Samson et al, 2002), and other wax-layer experiments (Babu et al, The similar Ψ L and g s of the plants grown under both soft and hard wax layers under all water regimes with or without root severing implied a negligible effect of impedance on root signals in this study (Fig. 4a, b, c), which differs from other reports (Mulholland et al, 1996;Hussain et al, 1999;Roberts et al, 2002).…”

Section: Root Signals In Response To Mechanical Impedance In the Greementioning

confidence: 52%

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Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

Siopongco

Sekiya

Yamauchi

et al. 2009

Plant Production Science

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: Previously, we demonstrated that root tips in drying soil communicate with shoots for stomatal closure in rainfed lowland rice, despite further water being available at depth. This study examines variation between two lines in root signals. Rice lines CT9993 and IR62266 were grown in the fi eld, and in the greenhouse with the split-root root-sever wax-layer system, to investigate their responses to mild and severe water defi cit by monitoring stomatal conductance (g s ), leaf water potential and leaf ABA concentration. In the greenhouse, root systems were divided, withholding water from one portion, and in some cases, severing the droughted portion of roots to remove the signal. Wax layers differing in strength were placed at hardpan depth. Roots of CT9993 were better able to penetrate the wax layers. IR62266 exhibited stronger responses than CT9993, with IR62266's stomatal conductance dropping sharply under water defi cit, and recovering at slower rates but less completely, when roots subjected to drying soil were severed. The greater stomatal response in IR62266 was associated with a higher leaf ABA concentration during early water defi cit, which in turn was associated with its greater number of roots in drying soil. In the fi eld, a second reduction in g s was observed under severe water defi cit, with stronger signals in IR62266 associated with more conservative water use as soil drying intensifi ed. To better exploit subsoil water in mild or transient water defi cit, selection for reduced root signals might be warranted.

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supporting

confidence: 82%

Section: Root Signals In Response To Mechanical Impedance In the Greementioning

confidence: 52%

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

Siopongco

Sekiya

Yamauchi

et al. 2009

Plant Production Science

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“…This plasticity in root system development is functionally effective and efficient for the enhancement of water uptake especially under mild water deficit conditions (Kano-Nakata et al, 2011). On the other hand, it has been well established that deep rooting avoids drought-induced stress by extracting available water from the deep soil layers (Azhiri-Sigari et al, 2000;Kato et al, 2007;Gowda et al, 2011). A typical example of advantageous effects of deep rooting were recently reported by Uga et al (2011), who mapped a quantitative trait locus (QTL) for deep rooting, DEEPER ROOTING 1 (DRO1) that enables rice plants to produce more grains under drought-induced stress without yield penalty.…”

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confidence: 99%

Matching the Expression of Root Plasticity with Soil Moisture Availability Maximizes Production of Rice Plants Grown in an Experimental Sloping Bed having Soil Moisture Gradients

Kameoka

Suralta

Mitsuya

et al. 2015

Plant Production Science

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“…The differences of the two parental lines was characterized under both stress and non-stress conditions in the greenhouse and in the field. 24 The rice genotypes exhibiting high proline accumulation had a marked effect on the ability to maintain water status, consequently delayed tissue death and leaf senescence in rice under water stress. 8 The ability to survive during drought and recovery periods affects the yield of rainfed rice.…”

Section: Discussionmentioning

confidence: 99%

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Uyprasert¹,

Toojinda²,

Udomprasert³

et al. 2004

ScienceAsia

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Drought is a major impediment to a rainfed lowland rice system. Drought tolerance has been associated with proline accumulation in roots and leaves. However, genetic linkage was uncertain. To determine if there is a genetic correlation between proline accumulation and drought tolerance; a total of 220 double haploid lines, their parents (CT9993 and IR62266), and three standard checks (IR20, NSG19 and KDML105) were used in experiments to determine the extent of genetic variation in root characters, proline accumulation, relative water content, visual leaf rolling and drought injury under different intensities of water deficit. Genotypes with high proline content in leaf tissues were more dehydration tolerant, a relatively high water content was maintained, and leaf rolling and senescence were delayed under severe water deficit. However, the ability of rice roots to penetrate deep into the soil was negatively correlated with proline accumulation in leaf tissue. Rice roots are mostly distributed at 0-30 cm soil depth under lowland conditions. Therefore, the ultimate goal to combine high dehydration tolerance with strong root penetration may not be realized in the existing germplasm.

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Genotypic Variation in Response of Rainfed Lowland Rice to Drought and Rewatering

Cited by 97 publications

References 16 publications

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

Matching the Expression of Root Plasticity with Soil Moisture Availability Maximizes Production of Rice Plants Grown in an Experimental Sloping Bed having Soil Moisture Gradients

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