Plant Responses to Water Stress

Hsiao, Theodore C.

doi:10.1146/annurev.pp.24.060173.002511

Cited by 3,024 publications

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“…Exploring its range and accurate amount of different genotypes is of importance to understanding physiological mechanisms of wheat resistance and tolerance drought and saving-water agriculture by the way of physiological regulation in arid and semi-arid locations. Secondly, our experimental results further demonstrated the fact accepted and adopted by most scholars [25], that 75%QF, 55%QF, and 45%QF is normal, light-stressed, and severe-stressed water level, respectively, is needed to be modified in order to represent the practical level of more plants. Thirdly, WUE was in better concert with production for most wheat genotypes (Figs.…”

Section: Discussionsupporting

confidence: 52%

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Relationship between water use efficiency (WUE) and production of different wheat genotypes at soil water deficit

Shao

Chu

et al. 2006

Colloids and Surfaces B: Biointerfaces

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Through 2-year field experiments, 7 wheat genotypes were better in their field yield. These 7 wheat genotypes and other 3 wheat species, which are being popularized on a large scale in different locations of China, were selected as experimental materials for the sake of measuring their difference in WUE and production and comparing their relationship at soil water deficits, future more, providing better drought resistance lines and theoretical guide for wheat production and practices and exploring anti-drought physiological mechanisms of different wheat genotypes. Under the condition of 3 soil-water-stress treatments (75% field capacity (FC), 55% FC, 45% FC, named level 1, level 2 and level 3, respectively), pot experiments for them were conducted and the related data were collected from their life circle. The main results were as followed: (1) according to the selected soil stress levels, water use efficiency (WUE) of 10 different wheat genotypes was divided into two groups (A and B); group A included genotypes 2, 3, 4, 5, 6, 7, 8, whose WUE decreased basically from level 1 to level 3 and reached individual peak of WUE at level 1; Group 2 included genotypes 1, 9, 10, whose WUE reached their individual peak at level 2; (2) based on total water consumption through all life circle, genotypes 1, 4, 8, 9 had lower water consumption (TWC) at level 1, genotypes 2, 3, 5, 6, 7 lower TWC at level 2, genotype 10 lower TWC at level 3; (3) at level 1, genotypes 2, 3, 4, 5, 6, 7, 8 had higher grain weight of single spike (GWSS), genotypes 1, 9, 10 better GWSS at level 2, which was in good line with individual WUE of different wheat genotypes; (4) by analyzing the indexes related to examining cultivars, it was found that genotypes 1, 2, 3, 4, 5, 6, 9, 10 had longer plant length (PL), spike length (SL), bigger grain number (GN) except genotypes 7 and 8 at level 1, RL was in better line with genotypes 1, 2, 3, 8, 9, 10, but not in the other genotypes at level 1.

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Section: Discussionsupporting

confidence: 52%

“…Each genotype was conducted in 3 level soil water treatments controlled by weighting (75% FC, 55% FC, and 45% FC, respectively) according to Hsiao [25], each of which is six times repeated and matched with 1 empty control, correspondingly.…”

Section: Experimental Designmentioning

confidence: 99%

Relationship between water use efficiency (WUE) and production of different wheat genotypes at soil water deficit

Shao

Chu

et al. 2006

Colloids and Surfaces B: Biointerfaces

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“…1a, b, c), which could indicate the use of carbohydrates for amino acid synthesis. Amino acid amounts increased from 06:00 to 18:00 h, probably due to a reduction in growth and protein synthesis, especially during the afternoon, indicating a mild water deficit effect, due to atmospheric conditions (Schulze, 1986), to which both processes are considered to be very sensitive, as stated by several authors in the past (Hsiao, 1973;Boyer, 1976;Lawlor, 1976), while amino acids continued to be synthesized (Hsiao, 1973;Hanson and Hitz, 1982).…”

Section: Discussionmentioning

confidence: 88%

“…4b, d) was negative for most of the water stress period. The accumulation of soluble sugars during day two of water shortage was probably due to the arrest in foliar growth, a process which is more sensitive with regard to water deficit than photosynthesis (Hsiao, 1973;Boyer, 1976) and sucrose synthase activity (Castrillo, 1992). From stress day four onward, the soluble sugar content at 18:00 h was significantly reduced, especially for Carioca, indicating a significant reduction in A during these days, reducing the soluble sugar daily balance to negative values (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…3), probably due to the water deficit effect of low air humidity on stomatal conductance (Schulze, 1986). However, a positive starch daily balance still occurred in leaves during mild water deficit, since starch hydrolysis only increases during severe water shortage (Hsiao, 1973;Vieira da Silva, 1976;Boyer, 1976). Soluble sugar and starch amounts acted contrary to one another, because starch synthesis occurs by combining sugars, whereas starch hydrolysis forms sugars, which are not used for growth under water deficit conditions (Hsiao, 1973).…”

Section: Discussionmentioning

confidence: 99%

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Daily balance of leaf sugars and amino acids as indicators of common bean (Phaseolus vulgaris L.) metabolic response and drought intensity

Santos

Pimentel

2009

Physiol Mol Biol Plants

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Leaf soluble sugar, starch and free amino acid amounts were evaluated in two bean genotypes, Carioca and Ouro Negro, grown in 10 L pots in a greenhouse. This was realized during a single day for Carioca and during ten days of water deficit for both genotypes, at 06:00 and 18:00 h. During the day, an increase in all parameters occurred up to midday, while in the afternoon, carbohydrate amounts varied in opposition to amino acids amounts. Under water deficit, the leaf soluble sugars at 18:00 and their daily balance (amount at 18:00 minus amount at 06:00) increased on the 2 nd day, with starch and amino acid amounts and their respective daily balances decreasing. On the 8 th and 10 th days, the soluble sugar daily balance was negative and the starch daily balance approached zero or was negative, while the amino acid daily balance was positive. During rehydration, soluble sugar daily balance was close to zero and starch daily balance increased, whereas amino acid daily balance was negative. The carbohydrate daily balance, strongly related to free amino acid daily balance, were good indicators for evaluating the stage of water deficit and metabolic capacity to respond to the stress in common bean.

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Optimal plant water‐use strategies under stochastic rainfall

Manzoni

Vico

Katul

et al. 2014

Water Resources Research

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Plant hydraulic traits have been conjectured to be coordinated, thereby providing plants with a balanced hydraulic system that protects them from cavitation while allowing an efficient transport of water necessary for photosynthesis. In particular, observations suggest correlations between the water potentials at which xylem cavitation impairs water movement and the one at stomatal closure, and between maximum xylem and stomatal conductances, begging the question as to whether such coordination emerges as an optimal water-use strategy under unpredictable rainfall. Here mean transpiration is used as a proxy for long-term plant fitness and its variations as a function of the water potentials at 50% loss of stem conductivity due to cavitation and at 90% stomatal closure are explored. It is shown that coordination between these hydraulic traits is necessary to maximize , with rainfall patterns altering the optimal range of trait values. In contrast, coordination between ecosystem-level conductances appears not necessary to maximize . The optimal trait ranges are wider under drier than under mesic conditions, suggesting that in semiarid systems different water use strategies may be equally successful. Comparison with observations across species from a range of ecosystems confirms model predictions, indicating that the coordinated functioning of plant organs might indeed emerge from an optimal response to rainfall variability.

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Plant Responses to Water Stress

Cited by 3,024 publications

References 3 publications

Relationship between water use efficiency (WUE) and production of different wheat genotypes at soil water deficit

Relationship between water use efficiency (WUE) and production of different wheat genotypes at soil water deficit

Daily balance of leaf sugars and amino acids as indicators of common bean (Phaseolus vulgaris L.) metabolic response and drought intensity

Optimal plant water‐use strategies under stochastic rainfall

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