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