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

doi:10.11924/j.issn.1000-6850.casb2020-0388

Abstract

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

CLC Number:

S166

Yang Mingfeng, Wang Jinmei, Ji Chunrong, Liu Yong, Bai Shujun. Response of Growth, Photosynthesis and Chlorophyll Fluorescence of Cotton to Drought Stress[J]. Chinese Agricultural Science Bulletin, 2021, 37(13): 22-28.

Figures/Tables 7

References 35

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处理	开花盛期	裂铃	吐絮	吐絮盛期	停止生长
CK	7.14	8.30	9.8	9.20	10.8
MD	7.14	8.28	9.6	9.16	10.8
SD	7.14	8.22	9.2	9.12	10.8

处理	开花盛期	裂铃	吐絮	吐絮盛期	停止生长
CK	7.14	8.30	9.8	9.20	10.8
MD	7.14	8.28	9.6	9.16	10.8
SD	7.14	8.22	9.2	9.12	10.8

处理	7月12日	8月1日	8月10日	8月22日	9月6日	9月22日
CK	5.0±0.85a	4.9±0.81a	5.2±1.26a	7.1±1.15a	2.2±0.25a	1.2±0.52a
MD	4.8±0.88a	3.9±0.40a	4.9±0.89a	5.8±.77ab	2.1±0.10a	1.0±0.05a
SD	4.7.±1.44a	3.6±0.68a	4.1±0.37a	4.1±0.77b	1.9±0.65a	0.8±0.17a

处理	7月12日	8月1日	8月10日	8月22日	9月6日	9月22日
CK	5.0±0.85a	4.9±0.81a	5.2±1.26a	7.1±1.15a	2.2±0.25a	1.2±0.52a
MD	4.8±0.88a	3.9±0.40a	4.9±0.89a	5.8±.77ab	2.1±0.10a	1.0±0.05a
SD	4.7.±1.44a	3.6±0.68a	4.1±0.37a	4.1±0.77b	1.9±0.65a	0.8±0.17a

处理	7月12日	8月1日	8月10日	8月22日	9月6日	9月22日	10月8日
CK	35.91±2.73a	35.25±0.10a	58.14±2.30a	81.42±5.09a	72.75±8.81a	55.06±4.10a	42.23±8.57a
MD	34.98±3.51a	35.57±2.78a	50.19±4.57b	72.02±0.76b	31.25±4.16b	34.05±3.33b	27.23±4.59b
SD	31.8±7.54a	36.39±3.37a	37.08±2.56c	43.66±1.58c	29.57±3.42b	21.65±3.74c	21.79±3.40b