Effects of Drought Stress and Rewatering at Seedling Stage on Light Energy Utilization and Antioxidant Enzymes Activities of Spring Maize Leaves

LIU Yanlan; GUO Xianshi; MA Mingsheng

doi:10.13870/j.cnki.stbcxb.2018.01.053

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Effects of Drought Stress and Rewatering at Seedling Stage on Light Energy Utilization and Antioxidant Enzymes Activities of Spring Maize Leaves

更新时间：2025-03-12

- Effects of Drought Stress and Rewatering at Seedling Stage on Light Energy Utilization and Antioxidant Enzymes Activities of Spring Maize Leaves
- Vol. 32, Issue 1, Pages: 339-343(2018)
- 作者机构：
  
  甘肃省农业科学院旱地农业研究所，甘肃省旱作区水资源高效利用重点实验室,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2018.01.053
  CLC： S365
- Published：2018
- 稿件说明：
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LIU Yanlan, GUO Xianshi, MA Mingsheng. Effects of Drought Stress and Rewatering at Seedling Stage on Light Energy Utilization and Antioxidant Enzymes Activities of Spring Maize Leaves[J]. 2018, 32(1): 339-343.
DOI：

LIU Yanlan, GUO Xianshi, MA Mingsheng. Effects of Drought Stress and Rewatering at Seedling Stage on Light Energy Utilization and Antioxidant Enzymes Activities of Spring Maize Leaves[J]. 2018, 32(1): 339-343. DOI： 10.13870/j.cnki.stbcxb.2018.01.053.

摘要

通过盆栽进行春玉米控水试验，设置3个控水水平(正常供水、中度干旱、重度干旱)、2个水分控制时段(干旱、复水)，研究苗期不同程度干旱胁迫及复水对春玉米叶片光响应曲线、CO2响应曲线及曲线拟合参数和抗氧化酶活性的影响。结果表明：干旱胁迫条件下春玉米叶片对光辐射的利用能力下降，随着干旱胁迫程度增加，叶片最大净光合速率(Pnmax)、表观量子效率(AQY)、光饱和点(LSP)、最大电子传递速率（Jmax）、最大羧化速率(VCmax)均显著下降，而光补偿点(LCP)、超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性均显著升高。复水后，前期中度干旱处理条件下玉米叶片Pnmax、AQY、LSP、Jmax、VCmax均高于一直正常供水水平和中度干旱水平；而前期重度干旱处理的上述各参数(Jmax、VCmax除外)均未达到一直正常供水水平，但高于重度干旱水平。SOD、POD和CAT活性均有所下降，但仍高于一直正常供水水平和干旱水平，而重度干旱后复水则下降幅度较小。苗期中度干旱锻炼具高抗氧化酶活性清除活性氧，使得膜脂过氧化程度轻，复水后其膜容易修复，使叶片光合效率产生超补偿效应，而重度干旱后复水其膜修复滞缓，使光合效率产生部分补偿效应。因此，在西北旱区春玉米生产实践中，如果进行抗旱锻炼，应限制在中度干旱水平，避免重度干旱。

Abstract

A pot experiment was conducted for water control test of spring maize. Three water control levels (normal water supply

moderate drought

severe drought) and two periods (droughting

rewatering) were set up to research the effects of different degrees of drought stress and rewatering during seedling stage on light response curve

CO2 response curve

curve fitting parameters and antioxidant enzymes activities of spring maize. The results showed that the light radiation utilization capacity of spring maize leaves was decreased under drought stress. [1]Along with the increasing drought stress

maximum leaf net-photosynthetic rate (Pnmax)

apparent quantum efficiency (AQY)

light saturation point(LSP)

the maximum electric transportation rate (Jmax)

and even the maximum carboxylation rate (VCmax) of spring maize leaves were all decreased significantly

however

light compensation point (LCP)

the activities of superoxide dismutase (SOD)

peroxidase (POD) and catalase (CAT) in leaves were apparently increased. After rewatering

the Pnmax

AQY

LSP

Jmax and VCmax under moderate drought stress in early stage were generally higher than those of normal water supply and moderate drought. However

the above parameters (except Jmax

VCmax ) under the severe drought did not reach the level of normal water supply

but higher than the severe drought. The SOD

POD and CAT activities had decreased

which still were higher than the normal water supply and drought level

and had a less decrement after severe drought stress. These results implied that a moderate drought hardening at the seedling stage could bring the higher antioxidant enzymes activities and remove the reactive oxygen species. Consequently

the reduced degree of membrane lipid peroxidation would make the membrane easier to be repaired after rewatering. These facts made the photosynthetic efficiency of the leaves produce a super-compensation effect. But after severe drought

the membrane repair was delayed

and the photosynthetic efficiency was just partially compensated. Hence

drought hardening should be limited in the level of medium drought for spring maize production in arid area northwest China

avoiding severe drought.

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WANG Ji-qing1,LIU She-ping1,HAN Bao-wen2 (1.College of Agriculture and Forestry,Hebei North University,Zhangjiakou,Hebei 075000,2.Institute ofAgricultural Resources and Environment,Hebei Academy of Agriculture and Forestry Sciences,,)

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