[1]姚春霞,张岁岐,燕晓娟.干旱及复水对玉米叶片光合特性的影响[J].水土保持研究,2012,19(03):278-283.
　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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干旱及复水对玉米叶片光合特性的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 19 期数: 2012年03期 页码: 278-283 栏目: 出版日期: 2012-06-20
Title:
Effects of Drought and Re-watering on Photosynthetic Characteristics of Maize Leaf
作者:
姚春霞1, 张岁岐1,2, 燕晓娟1
1. 西北农林科技大学 黄土高原土壤侵蚀与旱地农业 国家重点实验室, 陕西 杨凌 712100;
2. 中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100
Author(s):
YAO Chun-xia1, ZHANG Sui-qi1,2, 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
关键词:
玉米; 干旱胁迫; 复水; 光合; 叶绿素荧光; 叶水势
Keywords:
maize; drought stress; re-watering; photosynthesis; chlorophyll fluorescence; leaf water potential
分类号:
S513
摘要:
盆栽条件下，以玉米品种户单4号为材料，设正常供水（CK）、中度水分胁迫（MS）和重度水分胁迫（SS）三个水分处理，研究了拔节期和孕穗期水分胁迫及复水对玉米叶片光合、叶绿素荧光的影响，以期为玉米补偿机制的阐明提供理论依据。结果表明：（1）干旱胁迫使叶水势（ψleaf）降低，复水后拔节期重度胁迫叶水势迅速恢复并超过对照，而孕穗期则恢复缓慢；（2）拔节期和孕穗期重度胁迫降低了叶片净光合速率（Pn）、气孔导度（Gs）、胞间CO2浓度（Ci）、PSⅡ最大光化学效率（Fv/Fm）及光化学猝灭系数（qP），但复水5 d后可基本恢复至对照；Ci最低，气孔限制值（Ls）较对照分别增加了6.85%，9.52%，Fv/Fm值分别降低了1.72%和0.61%，表明气孔限制是Pn降低的主要原因；（3）拔节期重度胁迫叶的水分利用效率（WUE）高于对照，表现出补偿效应；孕穗期干旱胁迫下WUE表现为：MS>CK>SS，在复水第一天达最大值，随后趋于降低。说明拔节期和孕穗期光合特性变化存在差异性。
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 (ψleaf) 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 (Pn), stomatal conductance (Gs), the intercellular CO2 concentration (Ci), maximal efficiency of PSⅡ (Fv/Fm) and photochemical quenching coefficient (qP), but after five days of re-watering,these parameters can be recovered to control; the Ci was lowest, compared with control, stomatal limation value (Ls) increased by 6.85%, 9.52%,Fv/Fm reduced 1.72% and 0.61%, which indicated stomatal limitation was the major factor to the reduction of Pn; (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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备注/Memo

收稿日期:2011-12-2;改回日期:2012-2-22。
基金项目:国家重点基础研究发展计划（973计划）项目（2009CB118604）；国家自然科学基金项目（30971714）
作者简介:姚春霞（1987- ），女，河南沁阳人，硕士生，主要从事玉米水分生理研究。E-mail：xiaoliaoniniu89@163.com
通讯作者:张岁岐（1966- ），男，陕西岐山人，研究员，博士生导师，主要从事植物生理生态研究。E-mail：sqzhang@ms.iswc.ac.cn

更新日期/Last Update: 1900-01-01