文献类型：期刊文献

英文题名：Stem Photosynthesis of Twig and Its Contribution to New Organ Development in Cutting Seedlings of Salix Matsudana Koidz.

作者：Liu, Junxiang[1,2] Gu, Lin[1] Yu, Yongchang[1] Ju, Guansheng[1] Sun, Zhenyuan[1,2]

第一作者：刘俊祥

通信作者：Sun, ZY[1];Sun, ZY[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

年份：2018

卷号：9

期号：4

外文期刊名：FORESTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000434856800051)】；

基金：This work was supported by the Fundamental Research Funds for the Central Non-Profit Research Institution of Chinese Academy of Foresttry (CAFYBB2014QA003 and RIF 2013-04); and the National Natural Science Foundation of China (31600489). The authors thank Jinyao Zhang, Hao Shen, and Pengpeng Lang of the Chinese Academy of Forestry for their assistance in the experiment arrangement and sample processing, Yuan Cao of the State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry for the physiological analyses, and Zhigang Wu of the School of Civil Engineering, Guangzhou University for his help with the manuscript writing.

语种：英文

外文关键词：stem photosynthesis; organ development; cutting seedling; nonstructural carbohydrate; carbon isotope discrimination

摘要：The objective of this study was to illustrate the photosynthetic characteristics of current twigs of Salix matsudana Koidz., and clarify the effect of stem photosynthesis on the new organ development in cutting seedlings. Excised twigs were taken as the experimental samples. The response of the stem photosynthesis rate to increasing light intensity and the effective photochemical efficiency of the cross section of the twig were determined. Then, twigs were used as cuttings and exposed to 0, 20, and 100 mol m 2 s 1 light intensities, respectively, to achieve distinctive stem photosynthetic rates. After 14 days of treatment, stem water and non-structural carbohydrate (NSC) content, as well as the biomass and carbon isotopic composition, of new organs in the cutting seedlings under different light treatments were examined. The results showed that the gross photosynthetic rate significantly increased within 400 mol m 2 s 1 of light intensity, and the maximum rate was approximately 1.27 mol m 2 s 1. The effective photochemical efficiency of the PSII of the cortex was significantly higher than the inner tissues in the cross section of the twig. When twig cuttings were exposed to different light intensities, stem water and starch content, as well as bud and root biomass, were significantly higher in the cutting seedling subjected to 100 mol m 2 s 1 than the case treated in darkness; however, the bud d 13C trend was the opposite. Stem photosynthesis played a positive role in the maintenance of stem water and starch supply for the cutting seedlings, and 13C depleted assimilates produced by stem photosynthesis contributed to bud biomass, revealing that stem photosynthesis promotes organ development in cutting seedlings of Salix matsudana.