Chlorophyllafluorescence as an indicator of heat stress in cotton (Gossypium hirsutumL.)
Date
2020Author
Van der Westhuizen, M.M.
Berner, J.M.
Boogaers, N.
Oosterhuis, D.M.
Metadata
Show full item recordAbstract
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 yield potential. 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 made under 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 (F v/F m) 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 (F v/F m) decreased significantly when plants were subjected to 40 °C as compared to the 30 °C treatment. This decrease in the maximum quantum yield indicates damage to the photosynthetic apparatus of the plants
URI
http://hdl.handle.net/10394/35208https://www.tandfonline.com/doi/abs/10.1080/02571862.2019.1665721
https://doi.org/10.1080/02571862.2019.1665721