文献类型：期刊文献

英文题名：Leaf non-structural carbohydrate allocation and C:N:P stoichiometry in response to light acclimation in seedlings of two subtropical shade-tolerant tree species

作者：Xie, Hongtao[1] Yu, Mukui[1] Cheng, Xiangrong[1]

第一作者：Xie, Hongtao

通信作者：Cheng, XR[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Natl Res Stn Eastern China Coastal Forest Ecosyst, Hangzhou 311400, Zhejiang, Peoples R China

年份：2018

卷号：124

起止页码：146-154

外文期刊名：PLANT PHYSIOLOGY AND BIOCHEMISTRY

收录：;Scopus(收录号：2-s2.0-85041635786);WOS:【SCI-EXPANDED(收录号:WOS:000426231200016)】；

基金：We are grateful to all of the group members and workers in Qianjia Village Tree Nursery Station for their assistance in the field experiment. This research was supported, in part, by the National Natural Science Foundation of China (Grant No. 31300519) and Cooperative Program between Chinese Academy of Forestry and Zhejiang Province (16204002).

语种：英文

外文关键词：Shade-tolerant species; Photosynthesis; Leaf C, N and P; Leaf non-structural carbohydrates; RDA; Light acclimation

摘要：Light availability greatly affects plant growth and development. In shaded environments, plants must respond to reduced light intensity to ensure a regular rate of photosynthesis to maintain the dynamic balance of nutrients, such as leaf non-structural carbohydrates (NSCs), carbon (C), nitrogen (N) and phosphorus (P). To improve our understanding of the nutrient utilization strategies of understory shade-tolerant plants, we compared the variations in leaf NSCs, C, N and P in response to heterogeneous controlled light conditions between two subtropical evergreen broadleaf shade-tolerant species, Elaeocarpus sylvestris (E. sylvestris) and Illicium henryi (I. henrys). Light intensity treatments were applied at five levels (100%, 52%, 33%, 15% and 6% full sunlight) for 30 weeks to identify the effects of reduced light intensity on leaf NSC allocation patterns and leaf C:N:P stoichiometry characteristics. We found that leaf soluble sugar, starch and NSC concentrations in E. sylvestris showed decreasing trends with reduced light intensity, whereas I. henryi presented slightly increasing trends from 100% to 15% full sunlight and then significant decreases at extremely low light intensity (6% full sunlight). The soluble sugar/starch ratio of E. sylvestris decreased with decreasing light intensity, whereas that of I. henryi remained stable. Moreover, both species exhibited increasing trends in leaf N and P concentrations but limited leaf N:P and C:P ratio fluctuations with decreasing light intensity, revealing their adaptive strategies for poor light environments and their growth strategies under ideal light environments. There were highly significant correlations between leaf NSC variables and C:N:P stoichiometric variables in both species, revealing a trade-off in photosynthesis production between leaf NSC and carbon allocation. Thus, shade-tolerant plants readjusted their allocation of leaf NSCs, C, N and P in response to light acclimation. Redundancy analysis showed that leaf morphological features of both E. sylvestris and I. henryi affected their corresponding leaf nutrient traits. These results improve our understanding of the dynamic balance between leaf NSCs and leaf C, N and P components in the nutritional metabolism of shade-tolerant plants. Key message: Two species of understory shade-tolerant plants responded differently to varying light intensities in terms of leaf non-structural carbohydrate allocation and the utilization of carbon, nitrogen and phosphorus to balance nutritional metabolism and adapt to environmental stress.