生态与农村环境学报2018，Vol.34Issue(3)：224-231,8.DOI:10.11934/j.issn.1673-4831.2018.03.005
水淹胁迫对桢楠幼树生长及光合生理特性的影响
Effects of Flooding Stress on Growth and Photosynthetic Physiological Traits of Phoebe zhennan Saplings
摘要
Abstract
To study effects of flooding on growth and photosynthetic physiology of Phoebe zhennan saplings and provide certain theoretical basis for cultivation and water management of P. zhennan saplings,a pot experiment was conducted with the pots planted with 2.5 year-old P.zhennan saplings and flooded.The experiment was designed to have 6 groups or treat-ments,5 saplings each,for duration of flooding,i.e. 0(CK),7,14,21,28 and 35 days. Growth and photosynthetic in-dexes of the P. zhennan saplings in all the treatments were monitored. Results show:(1)Flooding significantly inhibited growth of the plants,though basal diameter of the plants increased first and then decreased in all the treatments. Net plant height decreased by 43.4%,59.2%,59.2% and 80.8% in Treatment 7D, 14D, 21D and 28D, respectively, as com-pared with CK(0 d),and the plants in Treatment 35D failed to survive;(2)Flooding altered the content and ratio of chloroplast pigments of P zhennan saplings in all the treatments, the contents of chlorophyll a(Chl a)decreased by 17.4%,22.0%,38.4% and 52.3%,respectively,while carotenoids / chlorophyll ratio increased by 32.3%, 71.0%, 32.3% and 45.2%,respectively in Treatment 7D,14D,21D and 28D,showing a trend of rising first and then declining;(3)Net photosynthetic rate(Pn), transpiration rate(Tr)and stomatal conductance(Gs)were declining significantly with the stress going on and, decreased by 89.6%, 98.2% and 98.7%, respectively in Treatment 28D. However, the concentration of carbon dioxide(Ci)between cells significantly increased by 216.2% in Treatment 28D;And(4)in the plants under stress,light compensation point(Lcp)and CO2compensation point(Ccp)showed an increasing trend,while the max net photosynthetic rate(Pn,max)and light saturation point(Lsp)decreased dramaticly. In conclusion,P. zhennan saplings exhibited showed low resistance to flooding stress, which significantly inhibited air exchange and photosynthetic rate and weakened the plants′ability to make use of light and CO2,and hence their photosynthetic capacity. In the experi-ment,the saplings exhibited their physio-ecological traits of low resistance to flooding. Most of the saplings began to wilt and die after 28 days of flooding and all the saplings died after 35 days of flooding.关键词
水淹胁迫/桢楠幼树/叶绿素/光合生理/生长Key words
submergence stress/Phoebe zhennan sapling/chlorophyll/photosynthetic physiology/growth分类
农业科技引用本文复制引用
陈玉凤,谭飞,胡红玲,胡庭兴,喻秀艳,周鑫,杨珊珊,张成浩,张建..水淹胁迫对桢楠幼树生长及光合生理特性的影响[J].生态与农村环境学报,2018,34(3):224-231,8.基金项目
四川省"十三五"农作物育种公关项目(2016NZ0098-10) （2016NZ0098-10）
四川省教育厅重点项目(13ZA0246) （13ZA0246）
