遮阴对四季桂生理生态特性的影响  

Effect of Shading on Physiological and Ecological Characteristics of Osmanthus fragrans

作　　者：杨亚男[1] 潘远智[1] 齐豫川 鲜小林[2,3] 陈睿[2,3] 刘柿良[1] YANG Ya-nan;PAN Yuan-zhi;QI Yu-chuan;XIAN Xiao-lin;CHEN Rui;LIU Shi-liang(College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China;Horticulture Institute, Sichuan Academy of Agricultural Science, Chengdu 610066, China;Genetic Improvement of Southwest Region of Ministry of Agriculture, Chengdu 610066, China)

机构地区：[1]四川农业大学风景园林学院,成都611130 [2]四川农业科学院园艺研究所,成都610066 [3]农业部西南地区园艺作物生物学与种质创制重点实验室,成都610066

出　　处：《热带亚热带植物学报》2017年第1期57-64,共8页Journal of Tropical and Subtropical Botany

基　　金：四川省自然科学基金项目(2014-LY-176)资助~~

摘　　要：为了解遮阴对四季桂(Osmanthus fragrans)生长的影响,研究了成都地区夏季遮阴处理下四季桂扦插苗生理生态特性的变化。结果表明,随遮光率增加,比叶重下降;叶绿素b(Chl b)含量增加,Chl a/b降低。遮阴下叶片可溶性糖、可溶性蛋白含量降低,以80%遮光率下降的最显著;随遮光率上升,叶片丙二醛(MDA)含量下降,超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性降低,以55%、80%遮光率的MDA含量下降显著。遮阴处理下,叶片光饱和点(LSP)、光补偿点(LCP)、最大净光合速率(Pmax)、暗呼吸速率(Rd)均下降,而表观量子速率(AQE)增大;瞬时光能利用率(LUE)升高,净光合速率(Pn)、气孔导度(Gs)、气孔限制值(Ls)均降低,胞间CO_2浓度(Ci)升高。四季桂幼苗主要通过提高Pn和抗氧化酶活性来适应强光环境;降低SLW、LSP、LCP和Rd,提高Chl和Ci含量,增大AQE和LUE提高弱光利用能力,中度遮阴(25%、55%遮光率)有利于幼苗在夏季的生长。In order to understand the effect of shading on growth of Osmanthus fragrans, the changes in physioecological characters of three-year-old O. fragrans seedlings in summer were studied under shading in Chengdu.The results showed that the specific leaf weight decreased, chlorophyll b content increased, but the chl a/b was reduced with increment of shading rate. The soluble sugar and soluble protein contents in leaf decreased under shading, while those had the most significant effect under 80% shading. Malondialdehyde (MDA) content in leafreduced, catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) activities decreased with increasingof shading rate, and MDA content decreased significantly under 55%-80% shading. The light saturation point(LSP), light compensation point (LCP), maximum net photosynthetic rate (Pmax) and dark respiration rate (Rd) alldecreased, but the apparent quantum effciency (AQE) increased under shading. Otherwise, instantaneous lightenergy utilization (LUE) increased, net photosynthetic rate (Pn) and stomatal conductance (Gs) decreased,inversely intercellular CO2 concentration (Ci) increased with the shading rate increment. Therefore, the seedlingsof O. fragrans could adapte to strong light environment by improving Pn and antioxidant enzyme activities;enhance weak light utilization ability by decreasing SLW、LSP、 LCP and Rd, and increasing chlorophyll content,Ci and AQE, LUE. So, it could grow better under moderate shading (25% and 55% shading rate) in summer.

关 键 词：遮阴 四季桂 抗氧化酶 光适应 

分 类 号：S685.13[农业科学—观赏园艺]