Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (13): 22-28.doi: 10.11924/j.issn.1000-6850.casb2020-0388

Special Issue: 油料作物 棉花 农业气象

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Response of Growth, Photosynthesis and Chlorophyll Fluorescence of Cotton to Drought Stress

Yang Mingfeng1(), Wang Jinmei2, Ji Chunrong3,4(), Liu Yong1, Bai Shujun1   

  1. 1Wulanwusu Agro-meteorological Station, Shihezi Xinjiang 832000
    2Business Section of Tacheng Meteorological Bureau, Tacheng Xinjiang 834700
    3Xinjiang Agriculture Network Information Center (Xinjiang Agro-meteorological Observatory), Urumqi 830002
    4Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002
  • Received:2020-08-21 Revised:2020-11-11 Online:2021-05-05 Published:2021-05-18
  • Contact: Ji Chunrong E-mail:490109498@qq.com;jcr83@163.com

Abstract:

To study the effects of drought stress on growth, photosynthesis and chlorophyll fluorescence of cotton, an experiment was conducted with 3 treatments: severe drought, mild drought and CK. Up-land cotton cultivar ‘Xinluzao 57’ was taken as the material and grown in soil moisture test site, and indicators including the development stages, LAI, biomass, seed cotton yield, water potential, photosynthesis and chlorophyll fluorescence were determined under different drought degrees. The results showed that: LAI, photosynthetic matter accumulation, seed cotton yield, net photosynthesis (Pn), transpiration rate (Tr), stomatal conductance (Gs), the maximal photochemical efficiency of PSⅡ in the dark (Fv/Fm), actual photochemical efficiency of PSⅡ in the light (Yield) and photochemical quenching coefficient (qP) presented downward trends along with the prolonging of the drought stress. Water potential increased at the early time, and then decreased, while non-photochemical quenching coefficient (qN) showed an increasing trend. Significant difference was found among Pn, Tr and Gs in drought treatment and CK (P<0.05). Significant difference was also found between severe drought treatment and CK for Yield, qP and qN after 15 days of drought stress. Pn, Tr, Gs, Yield, qP and qN could be considered as indicators in cotton leaves, while Pn, Tr, Gs were more sensitive.

Key words: cotton, drought stress, growth and development, water potential, photosynthesis, chlorophyll fluorescence parameters

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