Physiological mechanisms contributing to the increased water-use efficiency in winter wheat under deficit irrigation

Xue, Qingwu; Zhu, Zhanyuan; Musick, J. T.; Stewart, B. A.; Dusek, D. A.

doi:10.1016/j.jplph.2005.04.026

Cited by 171 publications

(101 citation statements)

References 27 publications

(65 reference statements)

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“…Similar results were reported by Xue et al (2006), implying that non-irrigated treatment reduces the photosynthetic rate and stomatal conductance in flag leaf. Kang et al (2002) and Wang et al (2013) reported that reduced irrigation and the application of fertilizer maintain the high photosynthetic capacity of wheat and reduce ET, resulting in high grain yield and WUE.…”

Section: Et = P + I + δW -R -Dsupporting

confidence: 87%

Effect of different supplemental irrigation strategies on photosynthetic characteristics and water use efficiency of wheat

Shi

et al. 2017

Chil. j. agric. res.

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346Water resource scarcity has been increasingly becoming a threat to wheat (Triticum aestivum L.) production in North China Plain. Thus, a water-saving irrigation strategy should be urgently developed. We conducted a 2-yr field experiment to examine the effects of supplemental irrigation (SI) on the photosynthetic characteristics and water use efficiency (WUE) of wheat. This study employed two SI strategies: A quota SI using 60 mm water at jointing and anthesis stages (W1) and soil moisture testing SI (W2), which brings the target relative soil water content of 0-40 cm soil layer to 70% field capacity at jointing and anthesis stages. A non-irrigated treatment (W0) was used as control. Results showed that W2 significantly improved the water uptake in 80-160 cm soil layer compared with W1. Moreover, flag leaf photosynthetic rate, stomatal conductance, and transpiration 14-28 d after anthesis were highest in W2 successively followed by W1 and W0, and the difference was significant. Dry matter (DM) at maturity, DM accumulation post-anthesis and its contribution ratio to grain were significantly higher in W2 than in the other treatments.13 CO 2 labeling results indicated that W2 promoted δ 13 C-photosynthate accumulation in grain. In 2012-2013 growing season, the grain yield increased by 56.05% and 5.74% and WUE increased by 26.17% and 6.34% in W2 compared with those in W0 and W1, respectively. In 2013-2014 growing season, the grain yield increased by 41.82% and 5.90% and WUE increased by 28.24% and 13.03% in W2 compared with those in W0 and W1, respectively. Therefore, W2 is a high-yield and watersaving treatment.

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Section: Et = P + I + δW -R -Dsupporting

confidence: 87%

Effect of different supplemental irrigation strategies on photosynthetic characteristics and water use efficiency of wheat

Shi

et al. 2017

Chil. j. agric. res.

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“…Our experiments in rice show that HRD expression causes significant increases of instantaneous and whole-plant WUE in well watered and drought conditions, with a very remarkable increase of 100% in absence of drought and a consistent 50% increase under drought stress. However, water deficit has been shown to increase WUE in different crops (25), the extent of which depends on the efficiency of carbon gain under stress conditions. Improvement of WUE in crops can be achieved by a decrease in stomatal conductance or increase in photosynthetic capacity (26).…”

Section: Discussionmentioning

confidence: 99%

Improvement of water use efficiency in rice by expression of HARDY , an Arabidopsis drought and salt tolerance gene

Karaba

Dixit

Greco

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

435

251

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Freshwater is a limited and dwindling global resource; therefore, efficient water use is required for food crops that have high water demands, such as rice, or for the production of sustainable energy biomass. We show here that expression of the Arabidopsis HARDY (HRD) gene in rice improves water use efficiency, the ratio of biomass produced to the water used, by enhancing photosynthetic assimilation and reducing transpiration. These drought-tolerant, low-water-consuming rice plants exhibit increased shoot biomass under well irrigated conditions and an adaptive increase in root biomass under drought stress. The HRD gene, an AP2/ERF-like transcription factor, identified by a gain-of-function Arabidopsis mutant hrd-D having roots with enhanced strength, branching, and cortical cells, exhibits drought resistance and salt tolerance, accompanied by an enhancement in the expression of abiotic stress associated genes. HRD overexpression in Arabidopsis produces thicker leaves with more chloroplast-bearing mesophyll cells, and in rice, there is an increase in leaf biomass and bundle sheath cells that probably contributes to the enhanced photosynthesis assimilation and efficiency. The results exemplify application of a gene identified from the model plant Arabidopsis for the improvement of water use efficiency coincident with drought resistance in the crop plant rice.biomass ͉ bundle sheath ͉ photosynthesis ͉ root strength ͉ transcription factor

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“…While in Texas WUE values of around 0.4 kg/m 3 were recorded under rainfed conditions (Xue et al 2006), values of 0.5-1.5 kg/m 3 were reported for irrigated fields (Howell et al 1995). According to Sun et al (2006), WUE values on the North China Plain are typically 0.97-1.83 kg/m 3 .…”

mentioning

confidence: 99%

Water use of winter cereals under well-watered and drought-stressed conditions

Varga

Varga-László

Bencze

et al. 2013

Plant Soil Environ.

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A reduction in the water available to plants will lend increasing importance to the dynamics of water uptake and to the water use efficiency (WUE) of cereals. The effect of drought on the water use efficiency of winter cereals was investigated in a greenhouse experiment in the Centre for Agricultural Research. The effect of water deficiency on the water use properties was studied by measuring changes in the grain weight, thousandkernel weight and aboveground biomass. The water use efficiency of wheat varieties generally ranged from 1.5-2.3 kg/m 3 and 1.06-2.0 kg/m 3 in the case of optimum and limited water supplies, respectively, while these figures were 1.4 kg/m 3 and 0.8 kg/m 3 for winter barley and 0.8 kg/m 3 and 0.5 kg/m 3 for winter oat. Investigation on the relationship between harvest index (HI) and WUE was found that the harvest index is only one indicator of drought tolerance; but the stability of HI under non-optimum environmental conditions also needs to be determined.

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Physiological mechanisms contributing to the increased water-use efficiency in winter wheat under deficit irrigation

Cited by 171 publications

References 27 publications

Effect of different supplemental irrigation strategies on photosynthetic characteristics and water use efficiency of wheat

Effect of different supplemental irrigation strategies on photosynthetic characteristics and water use efficiency of wheat

Improvement of water use efficiency in rice by expression of HARDY , an Arabidopsis drought and salt tolerance gene

Water use of winter cereals under well-watered and drought-stressed conditions

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