上海农业学报Issue(2)：45-50,6.DOI:10.15955/j.issn1000-3924.2015.02.10
不同根际温度对黄瓜幼苗生长、光合及叶绿素荧光特性的影响
Effects of root-zone temperature on the growth,photosynthesis and chlorophyll fluorescence characteristics of cucumber seedlings
摘要
Abstract
The effects of 20 ℃,25 ℃,30 ℃,35 ℃ root-zone temperature gradient on the growth,photo-synthesis and chlorophyll fluorescence characteristics of cucumber seedlings were investigated by nutrient solution culture method.The results showed that the seedlings had the largest amount of growth in 25 ℃ root-zone temper-ature,the relative chlorophyll content(SPAD),root activity,net photosynthetic rate(Pn ),excitation energy cap-ture efficiency of photosystem Ⅱ(PSⅡ)reaction center(Fv′?Fm′),actual photochemical efficiency of PSⅡ(ΦPSⅡ)and photochemical fluorescence quenching coefficient(qP)were the maximum in 4 treatments and the excited energy pressure of PSⅡ(1 -qP),partition imbalance of excited energy between PSⅠ and Ⅱ(β?α-1)were the minimum after treated 5 days,while the parameters showed a contrary tendency under 35 ℃ treatment.The pro-portion of absorbed light energy used for photochemical reaction(P)at 25 ℃ was the biggest,while the proportion of absorbed light energy used for antenna heat dissipation(D)at 35 ℃ was the highest,reaching up to 70.2%. The results suggested that the most suitable root-zone temperature for cucumber seedling was 25 ℃,higher or lower temperature would affect its growth,and the influence of high temperature was more serious.关键词
黄瓜/根际温度/幼苗生长/光合参数/叶绿素荧光参数Key words
Cucumber/Root-zone temperature/Seedling growth/Photosynthetic parameters/Chlorophyll fluorescence parameters引用本文复制引用
郝婷,丁小涛,张红梅,金海军,余纪柱..不同根际温度对黄瓜幼苗生长、光合及叶绿素荧光特性的影响[J].上海农业学报,2015,(2):45-50,6.基金项目
国家863计划（2013AA103006）；上海市科委重大项目（13231204200）；上海市农业科学院青年人才成长计划［沪农青字（2014）第1-10号］ （）
