Proline Accumulation in Water Stressed Cotton Leaves1
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Greenhouse‐grown cotton ( Gossypium hirsutum L.) plants were subjected to a drying cycle when the plants had four true leaves and the proline content of the leaf tissue was determined. Free proline accumulated to about 100 times the concentration of the well‐watered controls as the stress increased. The threshold of the predawn leaf water potential for proline accumulation was about —15 to —17 bars. Total proline content also increased, which suggested that there was some proline synthesis. Free glutamic acid concomitantly decreased. Because proline did not accumulate until the water deficits were quite severe concentration of free proline is not a good indicator of the onset of plant water stress.Keywords:
Water Stress
Drought stress
SUMMARY - Physiological parameters, proline accumulation and expression levels of drought related genes were analysed in durum wheat plants at flowering stage, comparing two varieties with different drought tolerance capacity. The imposed drought stress induced a lowering of water potential and of relative water content, a strong increase in proline and expression of drought related genes. The results showed differences in water potential and gene expression, being, the former, more negative and, the latter, higher in the drought tolerant variety Capeity 8 than in the susceptible one Creso. No differences were found in relative water content and in proline accumulation.
Drought Resistance
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Drought Tolerance
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This paper mainly studied on relevant physiological indexes of Viburnum opulus under drought stress treatment for 28 days with 2-year potted seedlings.The result showed that under drought stress,chlorophyll content appeared a decreasing trend,the content of free proline,MDA,soluble sugar,soluble protein and the conductivity percentage had an increasing trend.All the changes of physiological indexes showed that the plant had a better adaptability for drought stress and it's a drought resistance plant species.
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Drought Resistance
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The influence of water stress on proline metabolism was studied in 3-month-old mulberry plants at four levels of water stress. Leaf water potential was drastically decreased in all treatments. Though leaf area and relative water content were decreased, drastic decrease was observed only in very severe stress treatments. Proline accumulation was observed both in roots and leaves in stress treatments; but accumulation was greater in roots than in leaves. The enzymes, proline dehydrogenase and proline oxidase, were inhibited under stress conditions. Proline oxidase was more inhibited in roots than in leaves. The significance of the relative activities of these two enzymes is discussed.
Proline dehydrogenase
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A study on the physiological-biochemical changes of different ramie(Boehmeria Jacq. ) varieties under drought stress was carried out, the results showed that relative water contents(RWC) decreased and RPP increased with the increase of drought stress. Compared with drought sensitive varieties, drought resistant varieties had higher RWC in leaves but lower RPP. Peroxidase activity of drought-resistance varieties changed from low to high whereas sensitive ones changed in opposite direction. Proline contents of drought sensitive varieties was higher than those of drought resistant ones under a certain degree drought stress. Proline accumulation in drought resistant varieties was faster than that in drought sensitive ones under serious drought stress.MDA contents in leaf was increased under drought stress. MDA contents increased slowly in resistant varieties while that increased rapidly in sensitive ones.
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In order to investigate the reaction and adaptation of Sesum lineare under drought stress,its physiological and biochemical variations were studied by experiments of simulating drought stress,so as to find out the effect of drought stress on the content of MDA and POD.The result indicated that the activity of SOD and POD can be increased under slight drought stress,the activity of SOD and POD can be declined under severe drought stress and the content of MDA was enhanced under drought stress.It also showed that the content of chlorophyll was raised first,then delined,and delined continually later on.The content of proline was increased under water stress and it was delined under severe drought stress.
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Water and heat stress are the most important environmental variables affecting cotton growth and development. The main objective of our study was to evaluate the effect of water stress and a combination of water and heat stress on proline accumulation in six cotton cultivars (Gossypium hirsutum) and to determine the suitability of using this proline accumulation in a drought index. Drought and a combination of drought and heat stress were induced in three-week-old seedlings in the greenhouse. It was detected that with decreasing water content there was a progressive increase in free proline in all six cultivars, as well as differences in the proline level between the different cultivars. Maximum accumulation of free proline in drought stressed cotton occurred at 11 days without water. The combination of heat and drought stress exhibited an increase in proline concentrations in five cultivars. Different proline profiles were observed for the different treatments and different mechanisms for heat and drought are proposed for this phenomenon. Key Words: Drought stress, Gossypium hirsutum, proline (African Crop Science Journal 2000 8(1): 85-92)
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The influence of water stress on proline metabolism was studied in 3-month-old mulberry plants at four levels of water stress. Leaf water potential was drastically decreased in all treatments. Though leaf area and relative water content were decreased, drastic decrease was observed only in very severe stress treatments. Proline accumulation was observed both in roots and leaves in stress treatments; but accumulation was greater in roots than in leaves. The enzymes, proline dehydrogenase and proline oxidase, were inhibited under stress conditions. Proline oxidase was more inhibited in roots than in leaves. The significance of the relative activities of these two enzymes is discussed.
Proline dehydrogenase
Water Stress
Drought stress
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The effect of drought stress on the physiological and biochemcal indexes of maize seedlings was studied using the method of artificial water control.The results showed that drought stress could increase peroxidase(POD) activity and the contents of malondialdehyde(MDA) and proline(Pro) significantly,damage the membrane and increase the membrane permeability.Moreover,excessive drought could cause certain damage to maize seedlings.
Malondialdehyde
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Membrane permeability
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Two sweet potato varieties with different responses to drought condition,were used as experimental materials to study the physiological characteristics of sweet potato under drought stress.The results showed that the relative water content of leaves(RWC) decreased along with the time of drought stress,and it was also true for chlorophyll.The contents of malondialdehyde(MDA) and proline both continued to increase.The activities of superoxide dismutase(SOD) increased first and then decreased.
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Greenhouse‐grown cotton ( Gossypium hirsutum L.) plants were subjected to a drying cycle when the plants had four true leaves and the proline content of the leaf tissue was determined. Free proline accumulated to about 100 times the concentration of the well‐watered controls as the stress increased. The threshold of the predawn leaf water potential for proline accumulation was about —15 to —17 bars. Total proline content also increased, which suggested that there was some proline synthesis. Free glutamic acid concomitantly decreased. Because proline did not accumulate until the water deficits were quite severe concentration of free proline is not a good indicator of the onset of plant water stress.
Water Stress
Drought stress
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