文献类型：期刊文献

英文题名：Chitosan Oligosaccharide Addition to Buddhist Pine (Podocarpus macrophyllus(Thunb) Sweet) under Drought: Reponses in Ecophysiology and delta C-13 Abundance

作者：He, Chunxia[1,2] Zhao, Yan[1,3] Zhang, Jinsong[1,2] Gao, Jun[1,2]

第一作者：何春霞;He, Chunxia

通信作者：Gao, J[1];Gao, J[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China;[3]Henan Univ Sci & Technol, Forestry Coll, Luoyang 471002, Peoples R China

年份：2020

卷号：11

期号：5

外文期刊名：FORESTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000542736000007)】；

基金：This research was funded by the National Key Technologies R&D Program of China (grant number 2015BAD07B0202) and the Basic Research Fund of RIF (grant number CAFYBB2017SY002).

语种：英文

外文关键词：drought-resistance; soluble sugars; fine root morphology; seedling growth; biomass allocation; POD; SOD; CAT

摘要：Climate warming induces the necessity to increase the drought resistance of shade-obligate juvenile trees in sub-tropical forests. Chitosan oligosaccharide (COS) is a biopolymer derived from the marine resource that has attracted accumulative attention to induce and promote a plant's resistance to abiotic stress. Buddhist pine (Podocarpus mascrophyllus(Thunb)Sweet) seedlings were cultured as the model material whose natural distribution in sub-tropical areas of China has suffered severe summer drought events in the last 113 years. A split-block design was conducted with a simulated drought event (drought vs. irrigated control), the COS addition, and two samplings at the ends of drought and re-watered treatments. The COS addition increased the resistance to drought by inducing a starch allocation towards roots where delta C-13 abundance and antioxidant enzyme activities were upregulated. The COS addition can promote biomass allocation to roots and increase the number of new roots. The COS addition to drought-treated Buddhist pine seedlings resulted in robust diameter growth. Therefore, COS is an available polymer to promote the resistance of Buddhist pine to drought. More work is suggested to clarify the dose of COS addition that can induce a prominent response of biomass accumulation and carbohydrate metabolism.