高璐鑫, 王琪, 陈雨晴, 等. 春季亚低温胁迫对油茶‘华硕’叶片光合生理特性的影响[J]. 西南林业大学学报(自然科学), 2020, 39(0): 1–8 . DOI: 10.11929/j.swfu.0000-00
引用本文: 高璐鑫, 王琪, 陈雨晴, 等. 春季亚低温胁迫对油茶‘华硕’叶片光合生理特性的影响[J]. 西南林业大学学报(自然科学), 2020, 39(0): 1–8 . DOI: 10.11929/j.swfu.0000-00
Luxin Gao, Qi Wang, Yuqing Chen, Yongjiang Sun, Lingyun Zhang. Effects of Sub-chilling Stress in Spring on Photosynthetic Physiological Characteristics of Camellia Oleifera ‘Huashuo’ Leaves[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.0000-00
Citation: Luxin Gao, Qi Wang, Yuqing Chen, Yongjiang Sun, Lingyun Zhang. Effects of Sub-chilling Stress in Spring on Photosynthetic Physiological Characteristics of Camellia Oleifera ‘Huashuo’ Leaves[J]. Journal of Southwest Forestry University. DOI: 10.11929/j.swfu.0000-00

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春季亚低温胁迫对油茶‘华硕’叶片光合生理特性的影响

Effects of Sub-chilling Stress in Spring on Photosynthetic Physiological Characteristics of Camellia Oleifera ‘Huashuo’ Leaves

  • 摘要: 为探究亚低温胁迫对油茶叶片光合生理特性的影响,以油茶(Camellia oleifera)‘华硕’2年生盆栽苗为试材,通过测定亚低温10 ℃/5 ℃(昼/夜)胁迫过程中油茶叶片快速叶绿素荧光诱导曲线和830 nm光吸收曲线,结合叶片超微结构观察,分析叶片叶绿素含量、光系统活性、碳同化物含量的变化。结果表明:相比于正常温度28 ℃/20 ℃(昼/夜),亚低温胁迫处理的油茶叶片光系统II(PSII)与PSI活性均发生抑制;叶片快速叶绿素荧光诱导曲线分析发现亚低温胁迫下油茶叶片光合机构电子传递链活性显著降低,导致叶片光合机构的光合性能降低;随着亚低温胁迫处理时间的延长,可溶性糖含量呈增加趋势,淀粉含量逐渐降低。本研究表明在亚低温胁迫下,过剩激发能会抑制油茶PSII、PSI的活性,导致光合电子传递活性降低,且随着胁迫时间的延长,细胞膜系统会受到显著伤害,但一定时间内,油茶叶片可以通过累积可溶性糖,维持亚低温胁迫下光系统的活性。

     

    Abstract: To explore the effects of sub-chilling stress on the photosynthetic characteristics of Camellia oleifera leaves, 2-year-old potted seedlings of Camellia oleifera ‘Huashuo’ were used as the test material. The rapid chlorophyll fluorescence induction curve and 830 nm light absorption curve as well as ultrastructure of Camellia oleifera leaves under sub-chilling stress (10 ℃/5 ℃) were measured, and the effects of chlorophyll content, photosystem activity and carbon assimilate content were analyzed. Compared with the normal temperature(28 ℃/20 ℃), the chlorophyll contents, PSII and PSI photoinhibition occurred in the leaves of Camellia oleifera under sub-chilling stress. The rapid chlorophyll a fluorescence induction curve analysis showed that photosynthetic mechanism electron transfer chain of Camellia oleifera were inhibited in varying degrees under sub-chilling stress, resulting in a decrease of photosynthetic performance. In addition, with the extension of the sub-chilling stress treatment time, the relative conductivity, the soluble sugar content increased, but the starch content gradually decreased. This study shows that, under sub-chilling stress, excess excitation can inhibit the activities of PSII and PSI of Camellia oleifera, resulting in the decrease of photosynthetic electron transfer activity. And the cell membrane system got further damaged as the stress prolonged. However, within a certain period of time, the photosystems activities of Camellia oleifera leaves could maintain stable by accumulating soluble sugar contents.

     

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