Damage characteristics of photosynthetic system of two typical ephemeral plants in Mosuowan area caused by temperature and light

To explore the photosynthetic system adaptation mechanism of two dominant ephemeral plants, including Malcolmia scorpioides and Arnebia decumbens, to light and temperature, this study measured the chlorophyll fluorescence parameters and discussed their light damage and the change of photosynthetic a...

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Bibliographic Details
Published inGuangxi zhiwu Vol. 43; no. 9; pp. 1611 - 1621
Main Authors Huirong FU, Moxiang CHENG, Shuangquan XIE, Xiushuang WANG, Xingming HAO, Li ZHUANG
Format Journal Article
LanguageChinese
Published China Science Publishing & Media Ltd. (CSPM) 01.09.2023
Subjects
combined stress
ephemeral plants
photoinhibition
photoprotection
photosynthesis
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Summary:To explore the photosynthetic system adaptation mechanism of two dominant ephemeral plants, including Malcolmia scorpioides and Arnebia decumbens, to light and temperature, this study measured the chlorophyll fluorescence parameters and discussed their light damage and the change of photosynthetic activities under different temperatures (25-60℃) and constant room temperature (25℃) and high temperature and different illumination (80-400 μmol·m-2·s-1). The results were as follows: (1) The photosynthetic efficiency and electron transport rate increased first and then decreased with the increase of temperature, reached the highest value at 40℃ and then rapidly decreased, the quantum yield of non-regulated energy dissipation in PS Ⅱ［Y(NO)］and PS I receptor side heat dissipation efficiency［Y(NA)］increased, and the photosynthetic system was damaged due to the accumulation of excitation pressure at the receptor terminal. (2) Under the light range of 80-400 μmol·m-2·s-1 and room temperature, the photosynthetic efficie
ISSN:1000-3142
DOI:10.11931/guihaia.gxzw202206070