文献类型：期刊文献

英文题名：Effects of the Most Appropriate Proportion of Phytohormones on Tree-Ring Growth in Clones of Hybrid Larch

作者：Liu, Yucheng[1] Xie, Yunhui[1] Sun, Xiaomei[1] Zhang, Shougong[1]

第一作者：Liu, Yucheng

通信作者：Sun, XM[1];Zhang, SG[1]

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

年份：2023

卷号：15

期号：8

外文期刊名：SUSTAINABILITY

收录：;Scopus(收录号：2-s2.0-85156161313);WOS:【SSCI(收录号:WOS:000979569000001)，SCI-EXPANDED(收录号:WOS:000979569000001)】；

基金：The National Key Research and Development Program of China (2022YFD2200103), General Program of National Natural Science Foundation of China (31971652), and The Special Funds of Research Institute of Forestry (LYSZX202002).

语种：英文

外文关键词：larch; hybrid; wood formation; earlywood; latewood; auxin; gibberellin

摘要：The increase in the atmospheric carbon dioxide concentration promotes its accumulation in trees by regulating the synthesis and transportation genes for endogenous hormones, such as IAA and GA, which are key factors in regulating various life activities, including growth rings. To explore the impact of changes in endogenous hormone levels such as IAA and GA on the growth of tree rings, and to provide a basis for improving the management of hybrid larch clonal forests, we investigated the effects of exogenous indole-3-acetic acid (IAA), gibberellic acid 3 (GA(3)), and their combination on tree-ring growth in hybrid larch. IAA, GA(3), and a combination treatment were sprayed on the leaves of one clone of a hybrid larch seedling every three days. Small blocks were collected at the base stems for sequential anatomical observations. The phytohormone type, instead of the concentration, had a more significant effect on wood formation. Specifically, IAA treatment at 300 mg L-1 significantly increased latewood (LW) layers until 90 days after treatment (DAT). The 500 mg L-1 treatment significantly increased the wall radial thickness (WRT) of latewood (LW) cells. GA(3) treatment at 100 mg L-1 significantly decreased the layers and width of total wood (TW), LW, and earlywood (EW). The 300 mg L-1 treatment significantly increased the WRT of EW. The IAA 100 mg L-1 + GA(3) 100 mg L-1 combination treatment significantly increased the layers and width of TW and LW by inducing cambium activity and increasing the rate of wood cell development. The WRT and lumen radial diameter (LRD) of EW or LW in this treatment were similar to those observed with the corresponding single phytohormone treatment. These results indicate that combination treatment at 100 mg L-1 + 100 mg L-1 was a better way to promote tree-ring growth. Our study suggests that changes in phytohormone levels and ratios are important factors that affect tree-ring formation. Hormone levels and ratios should be regarded as important indicators to guide the improvement of management practices in hybrid larch clonal plantations.