江西农业大学学报2018，Vol.40Issue(3)：516-524,9.DOI:10.13836/j.jjau.2018068
干旱对云南蓝果树种子萌发的影响
Effects of Drought on Seed Germination of Nyssa yunnanensis
摘要
Abstract
For many plants, drought is an important factor affecting the natural regeneration of forest plants.However,the mechanisms by which drought affects natural regeneration of Nyssa yunnanensis are not well known.In this experiment,controlled experiments were conducted to study the effects of drought on water demand limitation and autotoxity on seed germination and early seedling growth of N. yunnanensis. The results showed that the concentration of PEG 6000,the concentration of extract solution and the source of extract or?gans (roots and leaves) had significant effects on seed germination and early seedling growth index of N.yun?nanensis.Morever,the seed germination rate,germination vigor,root length and seedling length decreased with the increase of the concentrations of PEG 6000 and extract solution.However,there was no significant difference between the concentration of 12.5 g/L and 25 g/L extract,and between 10％ and 15％ PEG 6000 concentra?tion.Established linear regression equation of two variables demonstrated that the absolute value of standardized influence coefficient of leaching solution is lower than that of PEG 6000 concentration, suggesting that the effects of water loss caused by PEG was more important than that caused by drought on seed germination. Therefore,water deficiency and aggravating autotoxicity caused by drought,which was induced by the change in original habitat and climate change,had jointly affected the seed germination and early seedling growth of of N. yunnanensis,thus hindering its natural regeneration.The results would illuminate impacts of drought on the nat?ural generation of N. yunnanensis and their mechanisms.Conclusions made from natural regeneration difficulties might partly help reveal endangered reasons of N. yunnanensis,which would provide scientific and theoretic ba?sis for its effective conservation.关键词
天然更新/干旱/水分需求/自毒效应/种子萌发Key words
natural regeneration/drought/water damand/autotoxicity/seed germination分类
农业科技引用本文复制引用
张珊珊,康洪梅,杨文忠,诺苏那玛..干旱对云南蓝果树种子萌发的影响[J].江西农业大学学报,2018,40(3):516-524,9.基金项目
国家自然科学基金项目(31460119,31660164)、科技基础资源调查专项(2017FY100100)和国家林业局野生植物保护管理项目( 2017YB1010) Project supported by the National Natural Science Foundation of China ( 31460119,31660164) ,Investigation of Basic Science and Technology Resources ( 2017FY100100 ) and State Forestry Administrationof China ( 2017YB1010) （31460119,31660164）
