Midday Drop of Leaf Water Content Related to Drought Tolerance in Snap Bean (<i>Phaseolus vulgaris</i>L.)

Omae, Hide; Kumar, Ashok; Egawa, Yoshinobu; Kashiwaba, Koichi; Shono, Masayuki

doi:10.1626/pps.8.465

Cited by 30 publications

(26 citation statements)

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“…Water stress significantly reduced RWC at two sampling times (8:00am and 1:00 pm) across the genotypes at different growth stages in all the four soybean genotypes studied. The reduction in RWC due to water stress was also reported by Omae et al (2005) and Omae et al (2007) in snap bean. Plants grown under water stress conditions showed a lower RWC than those grown under non stress conditions.…”

Section: Results and Discussion Leaf Water Potentialsupporting

confidence: 71%

“…Relative water content was higher in the morning, while decreased at noon. Several researchers reported that RWC of different crops was the highest in the morning and gradually decreased thereafter (Omae et al, 2005). Schonfeld et al (1988) reported that the cultivars that were resistant to drought had more RWC.…”

Section: Results and Discussion Leaf Water Potentialmentioning

confidence: 99%

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Effect of drought stress on water relation traits of four soybean genotypes

et al. 2018

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An experiment was conducted in a venyl house at the environmental stress site of Bangabandhu Sheikh Mujibur Rahman Agricultural University during September to December 2012 to know the internal water status under drought stress in soybean genotypes, viz. Shohag, BARI Soybean-6, BD2331 (relatively stress tolerant) and BGM2026 (susceptible). Drought (water) stress reduced the leaf water potential in all the genotypes though was more negative in tolerant genotypes than in susceptible ones. The lowest leaf water potential was obtained from BARI Soybean-6 (-1.58 MPa) and the highest in BGM2026 (-1.2 MPa). Relative water content (RWC) decreased remarkably in all the genotypes and reduction was more in susceptible than tolerant genotypes. At 8.00 am, RWC of stressed plants decreased by 9.58, 9.02, 8.90 and 13.90% in the genotype Shohag,, BARI Soybean-6, BD2331 and BGM2026 at vegetative stage, respectively. Drought stress decreased the exudation rate in all the genotypes of soybean and it was 24, 27, 22 and 12 mg h -1 in the genotype Shohag, BARI Soybean-6, BD2331 and BGM2026 at vegetative stage, respectively. Leaf temperatures in drought stressed plant were higher than in well-watered plants. Shohag, BARI Soybean-6, BD2331 and BGM2026 showed 4.7, 4.5 5.2 and 11.07% increase in leaf temperature due to water stress. At drought stressed treatment reduction in leaf water potential, relative water content, exudation rate and water retention capacity were noticed at the three growth stages in all the genotypes with a concurrent increase in leaf temperature. Genotypes BARI Soybean-6, Shohag and BD2331 showed considerably less reduction in relative water content, exudation rate and water retention capacity, high reduction in leaf water potential and less increase in leaf temperature during drought were considered as drought tolerant. However genotype BGM2026 showed considerably high reduction in relative water content, exudation rate and water retention capacity, low reduction in leaf water potential and high increase in leaf temperature was considered as drought susceptible.Keywords: Drought, stress, soybean, genotypes INTRODUCTION Water is absolutely necessary for the functioning of protoplasm of cell. Water deficit stress affects water status in plant. Thus adequacy and inadequacy of water are the limiting factors for life both in land and water environment (Onwugbuta-Enyi, 2004). Several methods are used to characterize plant water status under water stress conditions. Determination of water relation components in whole plant or cellular level is important for determination of tolerance genotypes to environmental stresses especially to water deficit stress. It may be possible to improve the water stress tolerance of soybean by understanding the water relation parameters that are associated with high productivity. Among the several methods used to characterize internal plant water status under water stress conditions, relative water content and leaf water potential are used as the indicators of degree of water stres...

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Section: Results and Discussion Leaf Water Potentialsupporting

confidence: 71%

Section: Results and Discussion Leaf Water Potentialmentioning

confidence: 99%

Effect of drought stress on water relation traits of four soybean genotypes

et al. 2018

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“…The rate of reduction was ranges from 31.37 to 55.88% the lowest where was in BARI Soybean-6 followed by BD2331 and Shohag (Table 4). The reduction in pod number plant -1 due to WS was reported earlier in french bean (Omae et al, 2005), in soybean (Kokubun et al, 2001;Liu et al, 2004) and in mungbean (Islam, 2008). The highest number of seeds pod -1 was observed in the genotype BGM2093 and the lowest from BARI Soybean-5 in both the environment.…”

Section: Seed Yield and Yield Contributing Characterssupporting

confidence: 74%

Genotypic variations in growth, yield and yield components of soybean genotypes under drought stress conditions

Chowdhury

Karim

Khaliq

et al. 2016

Bangladesh J. Agric. Res

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A pot experiment was carried out in a venylhouse at Bangabandhu Sheikh Mujibur Rahman University during 2012 to investigate the growth, yield and yield contributing characters of ten selected soybean genotypes viz. Shohag, BARI Soybean-6, BARI Soybean-5, BD2331, BD2329, BD2336, BD 2340, BGM2093, G00015 and BGM2026 under drought stress and control conditions. Plant height, number of leaves, leaf area, shoot and root dry weight of all the genotypes were significantly affected by the stress. Among the genotypes Shohag, BARI Soybean-6 and BD2331 were found tolerant in relation to the growth under water stress conditions. The reduction in RGR values was more in the susceptible genotypes at the later stages of growth than in the tolerant genotypes. Seed yield of the genotypes was reduced from 42 to 68% due to drought (water) over non-stress. Susceptible genotypes showed greater reduction in seed yield than the tolerant genotypes.

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“…Lower soil moisture and higher radiation levels result in greater positive temperature differences (Helyes and Varga, 1990;Helyes et al, 2006). The drop in the relative water content of bean leaves is greatest at noon, and the magnitude of the decrease is correlated with the pod number, seed size and seed yield, as reported by Omae et al (2005). The great genetic variation observed in the magnitude of this decrease allows selection to be made between the varieties for drought tolerance.…”

Section: Introductionmentioning

confidence: 89%

Studies on the drought and heat stress response of green bean ( Phaseolus vulgaris L.) varieties under phytotronic conditions

Nemeskéri¹,

Remenyik

Fári

2008

Acta Agronomica Hungarica

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The drought tolerance of six green-and yellow-podded varieties of green beans with different genetic backgrounds was tested in the phytotron. During the week prior to flowering the plants were kept either at 25/15°C (day/night) or at high temperature (30/15°C), with RH 75% and optimum water supplies. The heat-stressed plants were then divided into three groups; the first was returned to the control (25/15°C) chamber (RH 75%, optimum water supplies), while the second and third were exposed to mild drought stress (RH 60%, 50% water) at temperatures of 30/15°C and 35/25°C, respectively, throughout the flowering period.The varieties survived the short period of heat stress (30/15°C) prior to flowering without damage provided the temperature during flowering was reduced to 25/15°C and the water supplies were optimum. There was a sharp increase in the carotene level in the leaves of drought-stressed plants when the temperature during flowering was 30/15°C, but in plants exposed to 35/25°C during flowering the level dropped to near the control level. The latter group exhibited considerable damage, with a reduction in the water-soluble antioxidant content (ACW: antioxidant capacity of water-soluble substances) and the chlorophyll b content compared with the control.The antioxidant content (ACW) in the dark green leaves of green-podded varieties was lower than in the yellow-podded varieties and did not change as the result of drought and heat stress. In yellow-podded varieties, however, there was a significant decline in ACW in response to stress. Differences between the varieties in their adaptability to drought and heat could be detected as changes in the chlorophyll and carotene contents of the leaves even at 30/15°C.

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Midday Drop of Leaf Water Content Related to Drought Tolerance in Snap Bean (Phaseolus vulgarisL.)

Cited by 30 publications

References 4 publications

Effect of drought stress on water relation traits of four soybean genotypes

Effect of drought stress on water relation traits of four soybean genotypes

Genotypic variations in growth, yield and yield components of soybean genotypes under drought stress conditions

Studies on the drought and heat stress response of green bean ( Phaseolus vulgaris L.) varieties under phytotronic conditions

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