NDLI: Genotypic Variation in Biomass Production at the Early Vegetative Stage among Rice Cultivars Subjected to Deficient Soil Moisture Regimes and Its Association with Water Uptake Capacity

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Genotypic Variation in Biomass Production at the Early Vegetative Stage among Rice Cultivars Subjected to Deficient Soil Moisture Regimes and Its Association with Water Uptake Capacity

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Genotypic Variation in Biomass Production at the Early Vegetative Stage among Rice Cultivars Subjected to Deficient Soil Moisture Regimes and Its Association with Water Uptake Capacity

Content Provider	Taylor & Francis Online
Author	Ogawa, Atsushi Kokubun, Makie Kodama, Ikuko Matsunami, Toshinori Toyofuku, Kyoko Matsunami, Maya
Abstract	Genetic improvement in water uptake ability and/or water use efficiency (WUE) of rice cultivars is one option to enhance productivity under water-limited conditions. We examined the genotypic variation in biomass production among 70 rice cultivars (69 cultivars of NIAS global rice core collection and Azucena) under different soil moisture conditions, and to identify whether water uptake ability or WUE is responsible for the variation, if any. Two-week-old seedlings were transplanted into pots and grown for three weeks in an environmentally-regulated growth chamber under three soil moisture regimes: flooded (−0.02 MPa soil water potential) and two unflooded (−0.10 and −0.52 MPa) conditions. Substantial genotypic variations in total dry weight (TDW) were observed under all three regimes. Among all the cultivars tested, TDW was significantly correlated with water uptake ability, but not with WUE. However, several cultivars exhibited comparably higher WUE while showing superior biomass production under the −0.52 MPa regime. The amount of water uptake was significantly correlated with root dry weight among cultivars regardless of moisture regimes, while substantial genotypic difference in the amount of water uptake per unit root dry weight was observed. These results indicate that a marked genotypic difference exists in biomass production at the early vegetative growth under water-deficient conditions, and that this difference appears to be ascribed primarily to greater water uptake capacity, and additionally to higher WUE in drought-tolerant cultivars.
Starting Page	82
Ending Page	91
Page Count	10
File Format	PDF HTM / HTML
ISSN	1343943X 13491008
DOI	10.1626/pps.15.82
Journal	Plant Production Science
Volume Number	15
Issue Number	2
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-12-03
Access Restriction	Open
Subject Keyword	Rice Diversity Research Set of germplasm Root formation Soil moisture Transpiration Water uptake ability Water use efficiency
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science

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