Tomato plants acclimate better to elevated temperature and high light than to treatment with each factor separately
Tomato plants acclimate better to elevated temperature and high light than to treatment with each factor separately
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DOI：
10.1016/j.plaphy.2016.03.030
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发表时间：
2016-07-01
影响因子：
6.5
通讯作者：
Velitchkova, Maya
中科院分区：
文献类型：
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作者：
Gerganova, Milena;Popova, Antoaneta V.;Velitchkova, Maya
研究了高温和强光两种因素单独或同时作用对番茄植株的色素组成、荧光特性、膜完整性和保护物质合成的影响。M 82)。中等温度(38/29摄氏度)在最佳或高光强下持续2天和6天，然后允许植株在最佳条件下恢复5天。用叶绿素荧光参数评价光系统I和光系统H活性的变化，并测定丙二醛含量作为胁迫诱导膜脂过氧化的指标。通过分析花色苷的积累来评估处理植株对高光和高温的响应。这两种应力因素对所研究参数的影响不同，强光强对光系统H的量子产率和光化学猝灭有较大的影响，高温下的光化学猝灭可得到一定程度的补偿。高温强烈降低了非光化学猝灭。获得的数据表明，在特定条件下两天后，植物趋于适应，但这是在较长的处理6天后实现的。在恢复期，光系统I的活性和光系统II的量子效率几乎完全恢复，而非光化学猝灭的值虽然略高，但没有达到处理开始时的水平。(C)2016年爱思唯尔·马森SAS。版权所有。
The influence of two factors - high temperature and high light intensity, acting separately or simultaneously on the pigment composition, fluorescent characteristics, membrane integrity and synthesis of protective substances was investigated in tomato plants (Solanum lycopersicum cv. M 82). Moderate elevated temperatures (38/29 degrees C) were applied under optimum or high light intensity for 2 and 6 days and after that the plants are allowed to recover for 5 days at optimum conditions. Parameters of chlorophyll fluorescence were used to evaluate the alterations of photosystem I and photosystem H activity and malondialdehyde content was determined as a measure of stress-induced peroxidation of membrane lipids. The response of treated plants to high light and elevated temperature was estimated by analyzing the accumulation of anthocyanins. Both stress factors exhibit different impact on studied parameters high light intensity influences considerably quantum yield of photosystem H and photochemical quenching that is compensated to some extent when applied at elevated temperature. High temperature reduces strongly non-photochemical quenching. Data obtained show that after two days under particular conditions, the plants tend to acclimate, but this is achieved after longer treatment 6 days. During the recovery period the activity of photosystem I and the quantum yield of photosystem II recover almost completely, while the values of non-photochemical quenching although slightly higher, did not reach the levels at the beginning of treatment. (C) 2016 Elsevier Masson SAS. All rights reserved.