土壤干旱条件下氮素营养对玉米内源激素含量影响

应用生态学报 ›› 2003, Vol. ›› Issue (9): 1503-1506.

土壤干旱条件下氮素营养对玉米内源激素含量影响

张岁岐, 山仑

中国科学院-水利部水土保持研究所, 西北农林科技大学, 黄土高原土壤侵蚀和旱地农业国家重点实验室, 杨凌 712100

收稿日期:2001-08-31 修回日期:2002-04-16 出版日期:2003-09-15
通讯作者: 张岁岐,男,1966年生,博士,研究员,主要从事作物水分及抗旱生理生态研究,发表论文30余篇,Tel:029-7019049,E-mail:sqzhang@ms.iswc.ac.cn.
基金资助:
国家自然科学基金项目(30170559);国家重点基础研究发展规划资助项目(G1999011708)

Effect of nitrogen nutrition on endogenous hormone content of maize under soil drought conditions

ZHANG Suiqi, SHAN Lun

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China

Received:2001-08-31 Revised:2002-04-16 Online:2003-09-15

摘要/Abstract

摘要： 在田间持水量分别保持于35%、55%和75%±5%的土壤水分条件下,利用盆栽实验研究了土壤干旱和氮素营养对玉米内源激素和气孔导度的影响。结果表明,土壤干旱下氮素营养明显降低了玉米根系木质部汁液ABA浓度,而正常供水下施氮处理间则无显著差异(施氮处理仍较低),同时测定的叶片ABA浓度则呈相反的变化趋势,表现为干旱下施氮处理要高于不施氮处理;施氮处理木质部汁液中ZRs浓度应低于相应的不施氮处理,在调控气孔行为方面并未表现拮抗ABA作用;3种土壤水分条件下,施氮玉米叶片的气孔导度均高于不施氮处理,与木质部汁液ABA浓度呈负相关,说明施氮处理较低的根源ABA浓度是导致其气孔导度较大的主要原因。

Abstract: It is realized in recent years that roots play an important role in the control of shoot growth and development, not only because they can continuously provide the shoot with water and nutrients, but also because some chemical messengers are produced in roots to response soil drought stress and transported through transpiration stream to shoot where physiological processes are regulated.Extensive studies showed that the decrease of leaf conductance was closely related to the increase of xylem ABA concentration, suggesting that ABA can act as a water stress signal to regulate the physiological response of shoot.Fertilizer plays an important role in increasing crop yield and water use efficiency (WUE) on dry-land farming.It is not clear, however, whether the application of Nfertilizer can affect the root's signal intensity in drought stress and thus regulate its stomatal responses.Experiment with 3 water levels (35%,55% 和75%± 5% of field capacity) and 2 Nfertilizer levels (high Nand low N) was designed to investigate the effect of soil drought and Nnutrition on endogenous hormone concentration (ABAand ZRs) and stomatal conductivity of maize under potted conditions.The results showed that the application of Nsignificantly increased the stomatal conductivity of maize leaf under both drought and watered conditions.Meanwhile, it markedly decreased the ABAconcentration in root xylem sap, but increased ABA concentration in leaf of maize under soil drought conditions.The application of Ndecreased ZRs concentration in root xylem sap as well, which means that ZRs did not play a role in counteractive to ABA under soil drought conditions.The lower ABAconcentration in root xylem sap of high Nmaize rather than the higher ABA concentration in maize leaf accounted for the higher stomatal conductivity of high Nmaize leaf under soil drought conditions.

中图分类号:

S513.062

张岁岐, 山仑. 土壤干旱条件下氮素营养对玉米内源激素含量影响[J]. 应用生态学报, 2003, (9): 1503-1506.

ZHANG Suiqi, SHAN Lun . Effect of nitrogen nutrition on endogenous hormone content of maize under soil drought conditions[J]. Chinese Journal of Applied Ecology, 2003, (9): 1503-1506.

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