Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying ; Evidence for Root Signals

Siopongco, Joel D. L. C.; Sekiya, Kazumi; Yamauchi, Akira; Egdane, James; Wade, Len J.

doi:10.1626/pps.11.28

Cited by 40 publications

(25 citation statements)

References 63 publications

(76 reference statements)

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“…4a). These responses were in accord with the results of Siopongco et al (2008), which implicated leaf ABA as a chemical signal from roots to reduce stomatal conductance under mild drought. Upon severing roots subjected to drought, reductions in both Ψ L and g s were observed for one day, which were probably due to wounding, but both parameters resurged strongly and thereafter, continued to increase progressively with time.…”

Section: Root Signals In Response To Water Deficit In the Greenhousesupporting

confidence: 89%

“…The previous study in this series, (Siopongco et al, 2008), demonstrated the existence of root signals in rainfed lowland rice. The decrease in g s and transpiration rate (Tr) before any decrease in leaf water potential (Ψ L ), which was associated with increased soil moisture tension (SMT) and a rise in leaf ABA, was consistent with the influence of a chemical signal under mild drought.…”

mentioning

confidence: 56%

“…A split-split-plot design with 7 replications was used, with three water-root treatments as main plots, two artificial hardpan treatments as subplots, and two lines as sub-subplots. The water-root treatments were similar to Siopongco et al (2008) : well-watered in both containers (W), water deficit in the outer container but without severing roots (D), and with roots in the drought-stressed outer container severed (S). The hardpan treatments were : (1) control or soft wax, 3% paraffin wax with 97% petroleum jelly; and (2) hard wax, 60% paraffin wax with 40% petroleum jelly.…”

Section: Experiments 1 (1) Cultural Detailsmentioning

confidence: 86%

“…A split-root protocol with an inner and an outer container, based on the protocol of Siopongco et al (2008), was used in this experiment. A split-split-plot design with 7 replications was used, with three water-root treatments as main plots, two artificial hardpan treatments as subplots, and two lines as sub-subplots.…”

Section: Experiments 1 (1) Cultural Detailsmentioning

confidence: 99%

“…Details of this experiment, conducted in the field at IRRI, Philippines during the 2002 wet season, were reported by Siopongco et al (2008), but additional data on genotypic variation are provided here. Briefl y, a split-split plot design with 4 replications was used, with two drought timings as main plots, (41 to 68 DAS and 69 to 97 DAS); two water regimes as subplots, (well-watered, with water maintained at 5 cm depth, and droughted with irrigation and rainfall excluded in the specifi ed periods); and two lines as sub-subplots (CT9993 and IR62266).…”

Section: Experiments 2 (1) Cultural Detailsmentioning

confidence: 99%

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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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Section: Root Signals In Response To Water Deficit In the Greenhousesupporting

confidence: 89%

mentioning

confidence: 56%

Section: Experiments 1 (1) Cultural Detailsmentioning

confidence: 86%

Section: Experiments 1 (1) Cultural Detailsmentioning

confidence: 99%

Section: Experiments 2 (1) Cultural Detailsmentioning

confidence: 99%

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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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Water-deficit treatment followed by re-watering stimulates seminal root growth associated with hormone balance and photosynthesis in wheat (Triticum aestivum L.) seedlings

et al. 2015

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Elucidating the growth responses of roots to water status will reveal physiological mechanisms underlying drought tolerance and water conservation in plants. Hydroponic experiments were conducted using two winter wheat cultivars, Wangshuibai (drought-sensitive) and Luohan 7 (drought-tolerant), and a water deficit was induced using a 20 % (m/v) aqueous solution of polyethylene glycol 6000 (-0.6 MPa). The lack of water significantly reduced the plant dry weight, leaf area, total root length (TRL) and surface area in seminal (SRs) and nodal roots (NRs), but the effects were less pronounced in Luohan 7 than in Wangshuibai. After re-watering, leaf area, TRL and surface area of Luohan 7 increased significantly, as compared to the controls, due to rapid compensatory growth of SRs, while those of Wangshuibai were still significantly reduced. Under water-deficit conditions, the concentrations of indole-3-acetic acid (IAA) and cytokinin (CTK) and their ratio (IAA/CTK) in SRs and NRs of both cultivars were significantly lower than those of controls, but increased after re-watering. However, Luohan 7 showed significantly increases in IAA/CTK of SRs as compared to the control. Net photosynthetic rate was much lower during water deficit in both cultivars, but it was enhanced significantly after re-watering, especially for Luohan 7. Moreover, sucrose content was significantly increased in leaves while reduced in roots under water-deficit conditions. After re-watering, sucrose content in leaves of both cultivars and in roots of Wangshuibai was severely reduced, while the values in roots of Luohan 7 were significantly increased as compared to the control. These results indicate that the drought-tolerant cultivar has a greater ability to maintain plant growth under water deficit and greater compensatory growth in SRs associated with higher IAA/CTK and photosynthetic products supply after re-watering.

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Dry matter production in relation to root plastic development, oxygen transport, and water uptake of rice under transient soil moisture stresses

2010

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Drought and waterlogging are important abiotic stresses negatively affecting plant growth and development. They are transiently recurring in rainfed lowlands and in water-saving system practicing intermittent irrigation. This study aimed to determine the contribution of plastic development and associated physiological responses of roots to shoot dry matter production under transient soil moisture stresses. To minimize effect of genetic confounding, a selected line (CSSL47) drawn from 54 chromosome segment substitution lines (CSSL) of Nipponbare (japonica type) carrying an overlapping chromosome segments of Kasalath (indica type), was used and compared with the recurrent parent Nipponbare. Under transient droughted-towaterlogged (D-W) conditions, CSSL47 showed greater shoot dry matter production than Nipponbare. This was due largely to its greater root system development through high induction of aerenchyma formation. Consequently, aerenchyma development effectively facilitated the internal diffusion of oxygen (O 2 ) to the root tips under sudden waterlogged condition supporting rapid recovery of stomatal conductance, transpiration, and photosynthesis. Likewise, CSSL47 showed greater shoot dry matter production than Nipponbare under transient waterlogged-to-droughted (W-D) conditions. This was due to CSSL47's greater root system development through more initiation of L type lateral roots that effectively maintained soil water uptake. This in turn sustained higher stomatal conductance, transpiration, and photosynthesis. Results implied that utilization of CSSLs could precisely reveal that root plastic development in response to transient soil moisture stresses contributed to the maintenance of shoot dry matter production.

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Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying ; Evidence for Root Signals

Cited by 40 publications

References 63 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

Water-deficit treatment followed by re-watering stimulates seminal root growth associated with hormone balance and photosynthesis in wheat (Triticum aestivum L.) seedlings

Dry matter production in relation to root plastic development, oxygen transport, and water uptake of rice under transient soil moisture stresses

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