| Cite this article: | 孙文君,江晓慧,付媛媛,等.盐胁迫对棉花幼苗叶片叶绿素荧光参数的影响[J].灌溉排水学报,0,():-. |
| SUN Wenjun,JIANG Xiaohui,FU Yuanyuan,et al.盐胁迫对棉花幼苗叶片叶绿素荧光参数的影响[J].灌溉排水学报,0,():-. |
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| Effects of salt stress on chlorophyll fluorescence parameters of cotton seedling leaves |
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SUN Wenjun1, JIANG Xiaohui2, FU Yuanyuan1,3, SHEN Xiaojun3, GAO Yang3, WANG Xingpeng1
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1.Tarim University;2.School of Hydraulic and Civil Engineering, Shandong Agricultural University;3.Key laboratory of crop water demand and regulation, ministry of agriculture and rural affairs/institute of farmland irrigation
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| Abstract: |
| 【Objective】To study the effects of salt stress on chlorophyll fluorescence characteristics of cotton seedling leaves, and provide a reference for understanding the physiological process of salt stress inhibiting cotton seedling. 【Method】The chlorophyll fluorescence parameters of cotton leaves were analyzed under four salt concentrations of 50, 100, 150 and 200 mmol . L-1 with "XinluZhong-37" as the test material. 【Result】Results showed that the relative chlorophyll content (SPAD), maximum fluorescence (Fm), minimum fluorescence (Fo), maximum quantum efficiency (Fv / Fm), actual quantum efficiency (Y (II)) and photochemical quenching (QP)) of cotton leaves in the treatment of 50 m mol L-1 were close to or lower than those values in CK, while the corresponding parameters in 100-200 m mol L-1 were significantly lower than CK. There was no significant difference in the non-photochemical quenching parameter of qN among different treatments. However, the excess light energy ((1-qp) / NPQ) and non-photochemical quenching parameter of NPQ in the treatments with high salt concentration were markedly greater than the values in CK, the difference in (1-qp) / NPQ and NPQ between the low salt concentration treatment and CK was insignificant. 【Conclusion】Cotton can avoid the damage of light reaction system through its own regulation mechanism in the low salt concentration of 50 ~ 100 mmol . L-1. When the salt concentration reaches 150 mmol . L-1, the light emission and electron transfer of cotton leaves are blocked, resulting in the significant decrease of light energy utilization efficiency of cotton leaves, and finally limiting the plant growth. |
| Key words: Cotton seedling; Salt stress; Fluorescence parameters; Relative chlorophyll content |
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