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首页> 外文期刊>South African Journal of Plant and Soil >Chlorophyll a fluorescence as an indicator of heat stress in cotton (Gossypium hirsutum L.)
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Chlorophyll a fluorescence as an indicator of heat stress in cotton (Gossypium hirsutum L.)

机译：叶绿素A荧光作为棉花（Gossypium hirsutum L）的热应激指示器

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摘要

Cotton (Gossypium hirsutum L.) is a major fibre crop that is greatly affected by climatic factors, especially drought and high temperatures. Excessive temperature (above 30 °C) during the reproductive stage (flowering) negatively affects cotton yieldpotential. Four diverse cotton genotypes were evaluated in a greenhouse study at Rustenburg, North West province, South Africa to elicit information on heat tolerance using chlorophyll a fluorescence (ChlF) measurements. The ChlF measurements were madeunder laboratory conditions in an effort to develop a quick, reliable and inexpensive procedure capable of predicting heat stress on cotton. Tests consisted of measurements of maximum quantum yield (FJFm) performed on intact leaves of cotton plants. Plants were subjected to two heat treatments, namely 30 °C and 40 °C for 6 hours, and measured with the M-PEA fluorometer. The maximum quantum yield (FJFJ decreased significantly when plants were subjected to 40 °C as compared to the 30 C treatment. Thisdecrease in the maximum quantum yield indicates damage to the photosynthetic apparatus of the plants.
机译：棉花（Gossypium hirsutum L.）是一种主要的纤维作物，受气候因素，特别是干旱和高温影响。在生殖阶段（开花）期间过度温度（高于30°C）对棉花的产生负面影响。四种不同的棉质基因型在南非南部西北部的Rustenburg，南非的温室研究中评估了使用叶绿素A荧光（CHLF）测量的耐热性的信息。在实验室条件下，CHLF测量旨在开发能够预测棉花热应力的快速，可靠和廉价的程序。试验包括在棉花植物的完整叶片上进行的最大量子产率（FJFM）的测量。将植物进行两种热处理，即30℃和40℃，6小时，并用M豌豆荧光计测量。与30℃处理相比，当植物进行40℃时，最大量子产率（FJFJ明显减少。最大量子产率的这种分泌物表明植物的光合装置损坏。

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