Effects of water stress and high-temperature stress on the-structure and activity of photosynthetic apparatus of Zea mays and Helianthus annuus
Effects of water stress and high-temperature stress on the-structure and activity of photosynthetic apparatus of Zea mays and Helianthus annuus
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DOI：
10.1023/a:1010961218145
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发表时间：
2000-01-01
期刊：
影响因子：
2.7
通讯作者：
Yordanov, I
中科院分区：
文献类型：
--
作者：
Dekov, I;Tsonev, T;Yordanov, I
研究了高温胁迫（HTS）和PEG诱导的水分胁迫（WS）对玉米光合机构功能活性和超微结构的影响。和向日葵（Helianthus annuus L.）植物进行了调查。在玉米植株组织中，WS引起RWC降低10.9%，HTS降低7.0%，与对照植株相比，两种处理同时施用后降低32.7%。在向日葵植物中观察到类似但更多表达的变化。向日葵对这些胁迫更为敏感。各处理后净光合速率均显著下降，向日葵下降幅度更大。在叶肉叶绿体中，单独施用WS和HTS后，基粒和类囊体的数量减少，出现电子透明空间。在复合胁迫（WS+HTS），基粒和基质类囊体受到相当大的影响，其中许多叶绿体被膜被部分破坏。
Effects of high-temperature stress (HTS) and PEG-induced water stress (WS), applied separately or in combination, on the functional activity and ultrastructure of the photosynthetic apparatus (PSA) of maize (Zea mays L.) and sunflower (Helianthus annuus L.) plants were investigated. In maize plant tissues WS provoked the decrease in RWC by 10.9 %, HTS by 7.0 %, and after simultaneous application of the both treatments the decrease was 32.7 % in comparison with control plants. Similar but more expressed changes were observed in sunflower plants. Sunflower was more sensitive to these stresses. Net photosynthetic rate decreased significantly after all treatments, more in sunflower. In mesophyll chloroplasts after separately applied WS and HTS the number of grana and thylakoids was reduced and electron-transparent spaces appeared. At combined stress (WS+HTS) granal and stromal thylakoids were considerably affected and chloroplast envelope in many of them was partially disrupted.