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[1]YAO Chun-xia,ZHANG Sui-qi,YAN Xiao-juan.Effects of Drought and Re-watering on Photosynthetic Characteristics of Maize Leaf[J].Research of Soil and Water Conservation,2012,19(03):278-283.

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Effects of Drought and Re-watering on Photosynthetic Characteristics of Maize Leaf

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 03 Page number: 278-283 Column: Public date: 2012-06-20

Title:: Effects of Drought and Re-watering on Photosynthetic Characteristics of Maize Leaf

Author(s):: YAO Chun-xia¹, ZHANG Sui-qi^1,2, YAN Xiao-juan¹; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: maize; drought stress; re-watering; photosynthesis; chlorophyll fluorescence; leaf water potential

CLC:: S513

DOI:: -

Abstract:: In this study, Maize (Zea mays L.) cross seeds (cv. Hudan4) were grown in pots. And three water treatments: normal water supply (CK), moderate water stress (MS) and severe water stress (SS) were designed to investigate the effects of water stress and re-watering on photosynthesis and chlorophyll fluorescence of maize leaf at elongation stage and booting stage,in order to provide theoretical basis for the explanation of compensation mechanism of maize. The results showed: (1) leaf water potential (ψ_leaf) reduced under drought stress, and leaf water potential of severe stress at elongation stage could recover rapidly and exceeded the control after re-watering, but the booting stage was slow; (2) severe stress at elongation stage and booting stage reduced the leaf net photosynthetic rate (P_n), stomatal conductance (G_s), the intercellular CO₂ concentration (C_i), maximal efficiency of PSⅡ (F_v/F_m) and photochemical quenching coefficient (qP), but after five days of re-watering,these parameters can be recovered to control; the C_i was lowest, compared with control, stomatal limation value (L_s) increased by 6.85%, 9.52%,F_v/F_m reduced 1.72% and 0.61%, which indicated stomatal limitation was the major factor to the reduction of P_n; (3) under the severe stress at elongation stage,the water use efficiency of leaf (WUE)was higher than the control, which showed the compensation effect; under drought stress at booting stage, the WUE showed that MS> CK>SS. After the first day of re-watering, the WUE were at peaks, then tended to decline. These results suggested that there would be different responses of photosynthetic characteristic between elongation stage and booting stage.

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