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植物研究 ›› 2022, Vol. 42 ›› Issue (6): 1096-1105.doi: 10.7525/j.issn.1673-5102.2022.06.020

• 生理与生态 • 上一篇    下一篇

遮荫对七子花幼苗光合特性和非结构性碳水化合物含量的影响

魏春燕1,2, 李月灵1,2(), 金则新1,2, 罗光宇1,2,3, 陈超1,2,3, 单方权4   

  1. 1.浙江省植物进化生态学与保护重点实验室,台州 318000
    2.台州学院生态研究所,台州 318000
    3.上海师范大学生命科学学院,上海 200234
    4.台州市绿心旅游开发促进中心,台州 318000
  • 收稿日期:2022-03-02 出版日期:2022-11-20 发布日期:2022-11-22
  • 通讯作者: 李月灵 E-mail:liyl@tzc.edu.cn
  • 作者简介:魏春燕(1997—),女,硕士研究生,主要从事植物生理生态学研究。
  • 基金资助:
    浙江省自然科学基金项目(LQ19C030001);国家自然科学基金项目(32001113);浙江省自然科学基金项目(LTY22C030002);台州学院杰出青年项目(2019JQ005)

Effects of Shading on Photosynthetic Characteristics and Non-structural Carbohydrate Content of Heptacodium miconioides Seedlings

Chunyan WEI1,2, Yueling LI1,2(), Zexin JIN1,2, Guangyu LUO1,2,3, Chao CHEN1,2,3, Fangquan SHAN4   

  1. 1.Zhejiang Provincial Key Laboratory of Plant Evolutionary and Conservation,Taizhou University,Taizhou 318000
    2.Institute of Ecology,Taizhou University,Taizhou 318000
    3.School of Life Sciences,Shanghai Normal University,Shanghai 200234
    4.Taizhou Green Heart Tourism Development Promotion center,Taizhou 318000
  • Received:2022-03-02 Online:2022-11-20 Published:2022-11-22
  • Contact: Yueling LI E-mail:liyl@tzc.edu.cn
  • About author:WEI Chunyan(1997—),female,master student,mainly engaged in the research of plant physiology and ecology.
  • Supported by:
    Zhejiang Provincial Natural Science Foundation of China(LQ19C030001);National Natural Science Foundation of China(32001113);Zhejiang Provincial Natural Science Foundation of China(LTY22C030002);Outstanding Youth Project of Taizhou University(2019JQ005)

摘要:

为探讨不同光环境下濒危植物七子花(Heptacodium miconioides)的生长及适应规律,以2年生七子花幼苗为研究对象,设置全光照、60%遮荫和90%遮荫3种光照强度,研究不同光环境对七子花幼苗的光合特性和非结构性碳水化合物(NSC)含量的影响。结果表明:(1)3种光照处理下,七子花幼苗的净光合速率(Pn)日变化均呈“单峰型”曲线,Pn日均值为全光照>60%遮荫>90%遮荫,90%遮荫下水分利用效率(WUE)日均值显著低于全光照和60%遮荫。(2)与全光照相比,60%遮荫下七子花幼苗的光补偿点(LCP)和暗呼吸速率(Rd)显著下降,而光饱和点(LSP)、最大净光合速率(Pnmax)、最大羧化速率(Vcmax)、最大电子传递速率(Jmax)和磷酸丙糖利用率(TPU)无显著差异;重度遮荫(90%遮荫)导致植株的PnmaxLSPLCPRdVcmaxJmaxTPU显著降低。(3)七子花幼苗叶片的淀粉、可溶性糖和NSC含量在60%遮荫处理中最高,90%遮荫处理下则显著下降。植株的NSC含量与PnVcmaxJmaxTPU呈显著正相关关系。综上所述,七子花在幼苗期具有一定的喜光性和耐荫能力,适度遮荫下植株可通过降低LCPRd来调整叶片的光合生理,维持较高的NSC含量,从而来提高对弱光的利用率和碳同化能力,但在生产育苗过程中过度遮荫不利于七子花幼苗的生长。

关键词: 七子花, 遮荫, 光合特性, 非结构性碳水化合物

Abstract:

To investigate the growth and adaptation of Heptacodium miconioides under different light conditions, two-year-old H. miconioides seedlings were used as materials under three light intensities(full light, 60% shade and 90% shade), and the photosynthetic characteristics and non-structural carbohydrate(NSC) content of H. miconioides were measured. The results showed that: (1)The diurnal changes of net photosynthetic rate(Pn) of H. miconioides seedlings under three light intensities showed “single-peak” curves. The daily mean values of Pn under three light intensities ranked as full light>60% shade>90% shade. The daily mean values of water use efficiency(WUE) under 90% shade treatment was significantly lower than those under full light and 60% shade treatments; (2)Compared with full light, the light compensation point(LCP) and dark respiration rate(Rd) of H. miconioides seedlings under 60% shade decreased significantly, while the light saturation point (LSP), maximum net photosynthetic rate(Pnmax), maximum carboxylation rate(Vcmax), maximum electron transport rate(Jmax), and triose phosphate utilization rate(TPU) had no significant difference respectively. As shading degree increased, the LSPPnmaxLCPRdVcmaxJmax and TPU of H. miconioides seedlings under 90% shade were significantly lower than those under full light and 60% shade treatments. (3)The contents of starch, soluble sugar and NSC in leaves of H. miconioides seedlings were highest under 60% shade treatment, and decreased significantly under 90% shade treatment. The NSC content of H. miconioides seedlings was significantly positively correlated with PnVcmaxJmax and TPU respectively. Therefore, H. miconioides had ability of photopholic and shade-tolerant at the seedling stage, and plants could adjust the photosynthetic characteristics of leaves by reducing LCP and Rd, and maintained a high NSC content under moderate shading conditions, thereby to improve the utilization rate of weak light and carbon assimilation ability, however, excessive shading was not conducive to the growth of H. miconioides seedlings.

Key words: Heptacodium miconioides, shading, photosynthetic characteristics, non-structural carbohydrate

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