文献类型：期刊文献

英文题名：Polysaccharide, proline, and anti-oxidation enzyme activities of Thailand rosewood (Dalbergia cochinchinensis) seedlings exposed to exponential fertilization

作者：Hong, Zhou[1] Guo, Junyu[1] Zhang, Ningnan[1] Yang, Zengjiang[1] Liu, Xiaojing[1] Cui, Zhiyi[1] Xu, Daping[1]

第一作者：洪舟

通信作者：Xu, DP[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, State Key Lab Tree Genet & Breeding, Guangzhou 510520, Peoples R China

年份：2022

卷号：33

期号：1

起止页码：75-87

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000622226300001)】；

基金：The work was supported by the Science Innovation Projects of Guangdong Province (grant number 2020KJCX007) and Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry (Grant No. CAFYBB2018SZ002).

语种：英文

外文关键词：Dalbergia cochinchinensis; Steady-state absorption; Phosphorus; Potassium; Antioxidant

摘要：Thailand rosewood (Dalbergia cochinchinensis) is a vulnerable high value tree species in subtropical and tropical Southeast Asia. The demand for the rehabilitation of the natural habitat of the species requires high-quality seedlings. However, current fertilizer regimes tend to deliver a coarse rate of fertilizers that result in a low uptake efficiency and a high risk of nutrient excess. Exponential fertilization is an effective approach to promote seedling quality through identifying an optimum dose out of a range of applications. In this study, Thailand rosewood seedlings were cultured in a mixed substrate of perlite, vermiculite, and peat (2:2:3, v/v/v) and received exponential fertilization from 0 (control), through 100, 200, 300, 400, and 600 mg nitrogen (N) per plant over a four-month cultural rotation. Height, diameter, and shoot biomass increased with fertilizer rate and were maximized at 300 mg N per plant. This application also reduced nutrient deficiencies and avoided excess supply compared to higher rates. Polysaccharide, proline, and anti-oxidation enzyme activities tended to be greater in unfertilized controls or in over-fertilized high dosages, with lower activities around 100-300 mg N plant(-1). Application of 300 mg N per plant was identified as the optimum dosage as it maximized nutrient reserves, polysaccharide and proline contents, and anti-oxidants without causing any symptoms from excess fertilizer toxicity. Future work is required to identify the effects of N-fixation on the formation of nutritional reserves in Thailand rosewood seedlings subjected to exponential fertilization.