The effect of drought and ultraviolet radiation on growth and stress markers in pea and wheat

脯氨酸 渗透压 生物 交货地点 花青素 含水量 脂质过氧化 抗氧化剂 干旱胁迫 园艺 氧化应激 植物 食品科学 化学 生物化学 氨基酸 岩土工程 工程类
作者
V. Alexieva,Iskren Sergiev,S. Mapelli,E. Karanov
出处
期刊:Plant Cell and Environment [Wiley]
卷期号:24 (12): 1337-1344 被引量:1853
标识
DOI:10.1046/j.1365-3040.2001.00778.x
摘要

Abstract It emerged recently that there is an inter‐relationship between drought and ultraviolet‐B (UV‐B) radiation in plant responses, in that both stresses provoke an oxidative burst. The purpose of this investigation was to compare the effects and interaction of drought and UV‐B in wheat and pea. The absence of changes in relative leaf water content (RWC) after UV‐B treatments indicate that changes in water content were not involved. RWC was the main factor resulting in reduced growth in response to drought. Increases in anthocyanin and phenols were detected after exposure to UV‐B. The increases do not appear to be of sufficient magnitude to act as a UV‐B screen. UV‐B application caused greater membrane damage than drought stress, as assessed by lipid peroxidation as well as osmolyte leakage. An increase in the specific activities of antioxidant enzymes was measured after UV‐B alone as well as after application to droughted plants. Proline increased primarily in drought‐stressed pea or wheat. Proline may be the drought‐induced factor which has a protective role in response to UV‐B. The physiological and biochemical parameters measured indicate the UV‐B light has stronger stress effectors than drought on the growth of seedlings of both species. The two environmental stresses acted synergistically to induce protective mechanisms in that pre‐application of either stress reduced the damage caused by subsequent application of the other stress.
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