天津农学院学报 ›› 2023, Vol. 30 ›› Issue (4): 1-7.doi: 10.19640/j.cnki.jtau.2023.04.001

• 研究与简报 •    下一篇

遮阴对森林草莓分株生理特性的影响

侯佳聪, 邱安然, 常琳, 于玮玮, 王丽娟, 龙鸿通信作者   

  1. 天津农学院 园艺园林学院,天津 300392
  • 收稿日期:2022-07-04 出版日期:2023-08-31 发布日期:2023-11-01
  • 通讯作者: 龙鸿(1964—),男,教授,博士,主要从事果树遗传、发育生物学研究。E-mail:longhong@tjau.edu.cn。
  • 作者简介:侯佳聪(1998—),女,硕士在读,主要从事果树遗传、生理研究。E-mail:1991171389@qq.com。
  • 基金资助:
    天津市科技局种业重大专项(17ZXZYNC00080)

Effects of shading on inter-ramet physiological characteristics in Fragaria vesca

Hou Jiacong, Qiu Anran, Chang Lin, Yu Weiwei, Wang Lijuan, Long Hong   

  1. College of Horticulture and Landscape, Tianjin Agricultural University, Tianjin 300392, China
  • Received:2022-07-04 Online:2023-08-31 Published:2023-11-01

摘要: 为探讨森林草莓通过匍匐茎产生的子株在弱光胁迫时的生理特性,以及在异质性生境和同质性生境下母株对子株的生理影响,本研究设置了不同遮阴梯度处理,模拟森林草莓自然生长于林缘(异质性生境,半遮阴)、林下(同质性生境,全遮阴)条件,测定了子株的光合特性、抗氧化酶活性、渗透调节物质等的变化。结果表明:全遮阴时的光合色素总量大于半遮阴,净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)在半遮阴时随遮阴率的增加而降低,而在30%全遮阴时PnGsTr均高于对照及其他处理;在自然光照下,夏季自然强光胁迫在CK和30%遮阴占主导,30%半遮阴子株丙二醛(MDA)含量骤增,其受到了所处异质性高光照母株的负影响;随遮阴率增大(>30%),植物体由自然强光胁迫转变为弱光胁迫占主导,两个处理组MDA含量均在50%遮阴时达到谷值,此时的抗氧化酶总活性最高,半遮阴子株的MDA含量显著低于全遮阴,表明弱光胁迫下母株对子株进行了“保护”,在70%遮阴时森林草莓可溶性蛋白(WSP)含量最低,生理平衡被破坏。子母株同处于30%遮阴时利于植株对光资源利用,50%遮阴利于植株在自然光照下生存,当分株处于异质性光时,高光照下的母株自身受到光抑制会向生长条件较好的子株获取资源,但当子株受到的弱光胁迫(>30%)占据主导时,母株便会正向保护子株,这种资源的双向传递有效缓解了环境胁迫,使得匍匐茎分株具有了较强的生态适应能力。

关键词: 森林草莓, 匍匐茎, 遮阴, 异质性生境, 同质性生境, 生理特性

Abstract: In order to explore the physiological characteristics of ramets of Fragaria vesca under low light, and to reveal the physiological effects of mother ramets on the stolon ramets in heterogeneous and homogenous habitats, different shade gradients were used to imitate the natural growth status at forest fringe(heterogenous habitat)and under forest(homogenous habitat). The photosynthetic characteristics, antioxidant enzyme activities, and osmotic substances of ramets were measured. The results showed that the total amount of photosynthetic pigments in full-shading was greater than that in half-shading. With the increase of shading rate, the net photosynthetic rate(Pn), stomatal conductance(Gs)and transpiration rate(Tr)of ramets decreased while Pn, Gs and Tr in 30% full-shading group were higher than those in control and other treatments. Under natural light, CK and 30% shading stress were dominant in summer, and the malondialdehyde(MDA)content of 30% half-shading strains increased sharply, which was negatively affected by the heterogeneous high light parent plants. With the increase of shading rate(>30%), the plant changed from natural high light stress to low light stress. The MDA content of both treatment groups reached the trough value at 50% shading, and the total antioxidant enzyme activity was the highest at this time, while the MDA content in daughter plants under half-shading group was significantly lower than those under full shading in F. vesca, showing that the mother plant protected the daughter plant under low light stress. The content of soluble protein(WSP)was the lowest at 70% shading, and the physiological balance was destroyed in F. vesca. When both mother and daughter plants were under 30% shading, it was beneficial for plants to utilize light resources. 50% shading was suitable for plant survival under natural light. When the plant was under heterogeneous light, the mother plant under high light would obtain resources from the daughter plant with better growth conditions due to photoinhibition. But when the low light stress(>30%)of the daughter plant was dominant, the mother plant would positively protect the daughter plant. This bi-directional transfer of stolon resources effectively alleviates environmental stress and makes stolon ramet have stable ecological adaptability.

Key words: Fragaria vesca, stolon, shade, heterogeneous habitat, homogenous habitat, physiological characteristics

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