应用叶绿素荧光技术快速预警乌鲁木齐典型农作物干旱胁迫

Abstract

Abstract: The change characteristics of the activity of Photosystem II and I of 4 typical crops (Cucumis sativus L.,Lycopersicon esculentum Mill.,Capsicum annuum L. and Solanum melongena L.) at their seedling stage in Urumqi under drought stress were investigated by chlorophyll fluorescence and absorbance spectroscopy. The relationships between soil moisture content and the photosynthetic parameters were also discussed. The results revealed that, under drought stress, the photosystem performance was dependent on soil moisture content. Fv/Fm and Y(II) were gradually restricted with decreasing soil moisture content, and it was significantly decreased with an occurrence of serious soil moisture deficiency. On the contrary, Y(NO) was gradually increased with decreasing soil moisture content. The potential PSⅡ reaction center activity, Fv/F0, was a promising indicator for distinguishing the tolerance of crops to drought stress and for early-warning drought stress. Soil moisture content had the significant positive correlations with Fv/Fm,Fv/F0, Y(II) and Y(ND),but the significant negative ones with Y(NO) and Y(I). Chlorophyll fluorescence parameters could be used to indicate the physiological status of crops and soil moisture content and to early warn the response of crop seedlings to drought stress. The study results also revealed that there was a difference in tolerance of seedlings of the 4 crops to drought stress. The tolerance of S. melongena L. seedling to drought stress was the highest, then that of C. sativus L. and L. esculentum Mill. seedlings, and that of C. annuum L. seedling was the lowest.

Key words:

drought stress, crop, seedling, soil moisture content, chlorophyll fluorescence, photosystem, early-warning, Urumqi

TONG Xiao-Qin, WANG Shu-Zhi, XIA Yong, ZHANG Ye, LIU Yue-Fang, PAN Xiang-Liang. Early-warning of Drought Stress for Typical Crops in Urumqi  with Chlorophyll Fluorescence Technique[J]., 2013, 30(5): 860-866.

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Early-warning of Drought Stress for Typical Crops in Urumqi  with Chlorophyll Fluorescence Technique

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