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

机构：[1] State Key Laboratory of Tree Genetics and Breeding, Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, 510520, 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：EI(收录号：20233414603922);Scopus(收录号：2-s2.0-85101968028)

语种：英文

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

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. ? 2021, Northeast Forestry University.