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- Title
Effects of soil progressive drought during the flowering and boll-forming stage on gas exchange parameters and chlorophyll fluorescence characteristics of the subtending leaf to cotton boll.
- Authors
LIU Zhao-wei; ZHANG Pan; WANG Rui; KUAI Jie; LI Lei; WANG You-hua; ZHOU Zhi-guo
- Abstract
To investigate the dynamic changes and response mechanisms of gas exchange parameters and fluorescence indices of the subtending leaf to cotton boll under soil progressive drought stress, pot experiments of the hybrid cotton No.3 were conducted with soil relative water content (SRWC) (75±5) % as control group, SRWC (60±5) % and SRWC (45±5) % as experimental groups dealt with progressive drought for 50 days. Results showed that, the net photosynthetic rate (Pn), stomatal conductance (gs) and leaf intercellular CO2 concentration (Ci) decreased while Lsincreased under SRWC (60±5) % for 0-21 days. Furthermore, there was no significant change in chlorophyll fluorescence indices. This indicated that stomatal limitation was the main reason for the reduction of photosynthesis of cotton. In addition, when drought for 21-49 days under SRWC (60±5)%, Pnkept decreasing, while Ci began to increase and Lsbegan to decrease. Potential photochemical efficiency (Fv/Fm), quantum yield of photo system II (ΦPSII) and photochemical quenching coefficient (qP) reduced significantly, but non-photochemical quenching coefficient (NPQ) first rose then decreased. Thus, non-stomatal limitation was the main reason why the photosynthesis of cotton reduced. Photosynthetic organization and photosynthetic enzyme system were destroyed, boll setting intensity reduced and the number of boll and yield reduced significantly. Drought for 0-14 days under SRWC (45±5) % treatment led to sharp decrease in Pn, gs and Ci, whereas Lsobviously increased. There was no significant change in Fv/Fm, ΦPSII, qp, indicating stomatal limitation was the main reason why the photosynthesis of cotton reduced. Pn decreased slowly, while Ci began to rise and Ls began to decline under SRWC (45±5) % treatment for 14-49 days. Fv/Fm, ΦPSII, qP decreased while NPQ rose first then declined, which indicated that non-stomatal limitation worked to reduce the cotton photosynthetic performance. The boll setting intensity reduced significantly and the number of boll and yield declined. The critical stress time of cotton growth in current study was 21 and 14 days respectively under SRWC (60±5) % and SRWC (45±5) % treatments during the flowering and boll-forming stage.
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2014, Vol 25, Issue 12, p3533
- ISSN
1001-9332
- Publication type
Article