干旱胁迫下欧李叶片光系统活性与超微弱发光的关系

doi:10.12190/j.issn.2096-1197.2020.06.02

Abstract

Abstract: 【Objective】To understand the photosystem activity under drought stress of Cerasus humilis (Bge.) Sok. leaves and its relationship with ultra weak luminescence,and reveal the effect of drought stress on the relationship between them from a microscopic perspective.【Methods】Using the Mengyuan Cerasus humilis(Bge.) Sok. species as the test material,water-controlling methods were used for drought stress. The relationship between the photosystem activity and the ultra weak luminescence was explored by studying the changes of chlorophyll fluorescence parameters and ultra weak luminescence of Cerasus humilis (Bge.) Sok. leaves under drought stress.【Results】With the deepening of the drought,the maximum fluorescence yield(Fm),maximum photochemical efficiency(Fv/Fm),relative photosynthetic electron transfer efficiency(ETR),PSⅡ potential activity(Fv/F₀),antenna conversion efficiency(Fv′/Fm′),the actual photochemical efficiency(ΦPSⅡ),and the photochemical quenching coefficient(qP)of Cerasus humilis (Bge.) Sok. leaves showed an overall downward trend,and were all lower than the control. The non-photochemical quenching coefficient(qN) and antenna thermal dissipation energy(D)showed an overall upward trend,and both were higher than the control. Ultra weak luminous intensity(UWL) showed a downward trend and was lower than the control. Correlation analysis showed that under drought stress,the ultra weak luminous intensity(UWL) and the actual photochemical efficiency(ΦPSⅡ)of Cerasus humilis(Bge.) Sok. leaves were extremely significantly positive correlation(P<0.01),and significantly positive correlation(P<0.05) with antenna conversion efficiency(Fv′/Fm′),and significantly negative correlation(P<0.05) with antenna thermal dissipation energy(D) and non-photochemical quenching coefficient(qN).【Conclusion】Under drought stress,the photosystem activity of Cerasus humilis (Bge.) Sok. leaves decreased compared with the control,and the ultra weak luminous intensity decreased also;the ultra weak luminous intensity decreased with the decrease of photosystem activity,indicating that the production of ultra weak luminescence was related to plant photosynthesis. The change of ultra weak luminous intensity was related to the strength of the photosystem activity.

Key words: Cerasus humilis (Bge.) Sok., Drought stress, Photosystem activity, Ultra weak luminescence

CLC Number:

S663.3

LI Shuqing, REN Pengda, LI Lianguo, SUN Cong, GUO Jinli. The relationship between the photosystem activity and ultra weak luminescence under drought stress of Cerasus humilis (Bge.) Sok. leaves[J].Journal of Northern Agriculture, 2020, 48(6): 6-12.

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The relationship between the photosystem activity and ultra weak luminescence under drought stress of Cerasus humilis (Bge.) Sok. leaves

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