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The Stimulating Effects of rewatering on Leaf Area of Winter Wheat Suffering Water Stress

Agricultural Sciences in China 2002年第2期1卷 177-183页

作者： LIU Xiao-ying, LUO Yuan-pei and SHI Yuan-chun( Institute of Resources and Environments , China Agricultural University, Beijing 100094 Institute of Agrometeorology, CAAS , Beijing 100081) Institute of Resources and Environments China Agricultural University Beijing 100094 Institute ofAgrometeorology CAAS Beijing 100081

After water stress at various levels and durations at different growth stages, rewatering could greatly stimulate the leaf area development of winter wheat. The results showed that the stimulation effect changed with water stress time, degree and duration. rewatering under earlier stress had greater stimulation effect on leaf area than that under later stress. Higher stimulation effect was observed under severe water stress than that under moderate stress. Longer duration of stress resulted in low stimulation effect. In spite of the greater stimulation effect under severe and longer stress, the final leaf area in these situations was lower than that under moderate stress and shorter duration. Whenever the stress occurred, the stimulating effect was due to the increase of the leaf area of the tillers. Once the leaf on the main stem emerged during stress period, rewatering had no effect on its size, and consequently its leaf area. The stimulation of rewateirng on leaf area contributed to the final grain yield by 45% under moderate stress, and 67% under severe stress. Although the stimulation partly compensated for the loss during stress, the final leaf area and the grain yield could not reach the level without water stress.

关键词： Water stress rewatering Winter wheat Stimulation Leaf area Yield

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Effect of Drought Stress and rewatering on the Photosynthetic Physiological Characteristics of Leaves and Bark of‘84K’Poplar

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Journal of Landscape Research 2020年第4期12卷 93-96,102页

作者： YU Yongchang College of Tourism Taishan UniversityTaianShandong 271000China

To study the difference of photosynthetic physiological indexes between leaf and bark of‘84K’poplar under drought stress and rewatering,the cutting seedlings of‘84K’poplar were treated with drought and rewatering for 7 days.The content of chlorophyll,gas exchange parameters and chlorophyll fl uorescence parameters in leaves and bark were measured.The results showed that the total chlorophyll content of bark was obviously lower than that of leaves.Compared with the control,the difference of chlorophyll(a+b)between drought and rewatering treatment was not signifi cant.The chlorophyll(a+b)of drought treatment decreased signifi cantly by 13.48%,and rewatering treatment could restore to the control level.The chlorophyll a/b of the bark was higher than that of the leaves,which indicated that the bark had a strong ability to utilize the weak light.Under drought stress,the actual photosynthetic rate of bark and leaves decreased by 46.71%and 67.59%respectively,and recovered to 74.45%and 57.55%after rewatering.Drought treatment had no signifi cant effect on chlorophyll fl uorescence parameters of bark,but had signifi cant effect on chlorophyll fl uorescence parameters of leaves.The effects of drought stress on gas exchange and chlorophyll fl uorescence of leaves were obvious,but the bark was not sensitive to drought stress.After rewatering,most of the photosynthetic parameters of leaves restored to the control level,showing a superior recovery ability.

关键词： Drought rewatering Bark Photosynthesis

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Changes in Content of Free,Conjugated and Bound Polyamines and Osmotic Adjustment in Adaptation of Vetiver Grass to Water Deficit

Changes in Content of Free,Conjugated and Bound Polyamines a...

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中国植物生理学会第十次会员代表大会暨全国学术年会

作者： Q. Zhou, B.J. Yu College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, P. R. Chinaa

＜正＞Osmotic adjustment and alteration of polyamines （PAs） have been suggested to play roles in plant adaptation to water deficit/drought stress. In this study, the changes in the cell membrane integrity, plant gro... 详细信息

关键词： Osmotic adjustment Polyamines rewatering Vetiver grass Water deficit

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