| 干旱胁迫对玉米品种苗期叶片光合特性的影响 |
| |
| 引用本文： | 张兴华,高杰,杜伟莉,张仁和,薛吉全.干旱胁迫对玉米品种苗期叶片光合特性的影响[J].作物学报,2015,41(1):154-159. |
| |
| 作者姓名： | 张兴华 高杰 杜伟莉 张仁和 薛吉全 |
| |
| 作者单位： | 西北农林科技大学农学院，陕西杨凌 712100 |
| |
| 基金项目： | 陕西省科技资源统筹专项(2011KTZB02-01-02);陕西省科技计划农业攻关项目(2014K01-02-03);西北农林科技大学创新专项(QN2011086)资助 |
| |
| 摘 要： | 维持较高的光合作用对于作物适应干旱逆境意义重大,光合电子传递和气孔行为是作物光合机构的重要组成部分,而玉米上有关它们之间的组合响应干旱胁迫研究报道较少。本文将2个主推玉米品种陕单609和郑单958生长在自然光和4个干旱胁迫下的干旱棚内,对其叶片的光系统II(PSII)的电子传递功能和气孔导度进行了研究。结果显示,中度和重度干旱胁迫下2个品种叶片净光合速率(Pn)和气孔导度(Gs)显著下降,而伴随着胞间CO2浓度(Ci)上升,显示光合速率下降是非气孔因素所致。JIP-test分析发现干旱胁迫下2个品种叶绿素荧光诱导动力曲线(OJIP)中出现了K-band,说明光系统II(PSII)放氧复合体(OEC)受到抑制和PSII供体侧与受体侧电子传递不平衡;同时干旱胁迫下反映从PSII供体侧到PSI末端受体电子流的荧光参数显著改变,损伤了光系统II和I之间光合电子传递链,限制CO2同化。品种间光合特性对干旱胁迫的响应存在差异,重度干旱对郑单958叶片光合机构的影响比对品种陕单609大。以上结果表明,中度和重度干旱下玉米品种叶片Pn下降归属于光化学活性的衰退;陕单609光合机构的耐旱性强于郑单958。
|
| 关 键 词： | 玉米品种 干旱胁迫 光合速率 OJIP荧光 |
| 收稿时间： | 2014-05-21 |
Effects of Drought Stress on Photosynthetic Characteristics of Maize Hybrids at Seedling Stage |
| |
| ZHANG Xing-Hua
,
GAO Jie
,
DU Wei-Li
,
ZHANG Ren-He
,
XUE Ji-Quan.Effects of Drought Stress on Photosynthetic Characteristics of Maize Hybrids at Seedling Stage[J].Acta Agronomica Sinica,2015,41(1):154-159. |
| |
| Authors: | ZHANG Xing-Hua GAO Jie DU Wei-Li ZHANG Ren-He XUE Ji-Quan |
| |
| Institution: | College of Agronomy, Northwest A & F University, Yangling 712100, China |
| |
| Abstract: | Maintaining active photosynthesis is very important for crops to adapt drought stress. The electron transport chain and stomatal conductance are important in photosynthesis. Limited data are available on their combined responses to drought stress in maize. In this paper, the effects of drought stress on photosynthetic characteristics in maize hybrids Shaandan 609 and Zhengdan 958 at seedling stage were investigated. The results showed that the CO2 assimilation (Pn), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) decreased during drought stress, showing the decreased photosynthesis due to stomatal factor. During moderate and severe drought stress, down-regulation in net CO2 fixation (Pn) was primarily mediated through non-stomatal limitation. The OJIP transients and other associated biophysical parameters elucidated the events of photoacclimatory changes in photosystem II (PSII) with progressive increase of drought stress, and the K-bands appeared in the stage of extreme drought severity indicating the imbalance between the electrons at the acceptor and donor sides of PSII, which suggested the oxygen-evolving complex (OEC) and electron transport were inhibited. In conclusion, the moderate and severedrought stress mainly damages the electron transfer from the plastoquinone (PQ) pool to the PSI terminal acceptors; this, along with constraints to both stomatal and non-stomatal components of photosynthesis, limits carbon assimilation. There are differences in cultivars with the response of PSII activity to drought stress. |
| |
| Keywords: | Maize Drought stress Photosynthetic characteristics OJIP |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《作物学报》浏览原始摘要信息 |
| 点击此处可从《作物学报》下载免费的PDF全文 |
|
