短时间亚高温处理及其恢复对番茄光合特性的影响  

Effects of short time sub-high temperature treatment and its recovery on photosynthetic characteristics of tomato(Lycopersicon. esculentum Mill.)

作　　者：张洁[1] 李天来[2] 

机构地区：[1]河海大学现代农业工程系,南京210098 [2]沈阳农业大学园艺学院辽宁省设施园艺重点实验室,沈阳110161

出　　处：《农业工程学报》2007年第1期162-167,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(30170640);辽宁省自然科学基金资助项目(20022080)

摘　　要：以“辽园多丽”番茄(L y cop ersicon.escu lentum M ill.)为试材,在植株第1花序第1花开花时,对其进行2 h+15 m in(光合测定平均时间,下同)、4 h+15 m in、6 h+15 m in、8 h+15 m in的35℃昼间亚高温处理,之后转入25℃条件下分别恢复6 h、4 h、2 h,以25℃处理为对照,研究较短时间亚高温处理及常温恢复对番茄光合作用及叶绿素荧光作用的影响。结果表明:35℃昼间亚高温处理2 h,番茄叶片光合作用即明显降低;而亚高温处理2 h、4 h和6 h的植株在25℃恢复的最初2 h内光合作用持续下降。经35℃亚高温处理2 h,番茄叶片各项叶绿素荧光参数均降低,但亚高温处理6 h内的植株在常温恢复2 h后各项指标即可恢复正常。综合认为,番茄植株经过2 h的35℃昼间亚高温处理,当天的光合作用就难以恢复到对照水平,在持续亚高温条件下,净光合速率的降低主要由非气孔限制因素引起的;而气孔限制因素则是亚高温处理后处于常温恢复初期的植株光合作用下降的一个重要原因。Changes of photosynthesis and fluorescence parameters of tomato （Lycopersicon. esculentum Mill. ） under short time 35℃ sub-high temperature treatment and normal temperature recovery in daytime were studied to investigate the effects of short time sub-high temperature treatment on photosynthetic characteristics of tomato. Plants were treated by 35℃ sub-high temperature for 2 h＋15 min （the even time of measurement ,the same as below）, 4 h＋15 min, 6 h＋15 min, 8 h＋15 min, then resumed at 25℃ when the 1^st inflorescence effloresced, and plants that under 25℃ all the time considered as control. Results showed that the photosynthesis decreased after plants were treated by 35℃ for more than 2 h. Within the first 2 h that plants were transferred from 35℃ to 25℃ to resume, the photosynthesis continued to decrease. The intrinsic photochemical efficiency （Fv/Fm）, quantum yield of PS Ⅱ （ΦPSⅡ ） and photochemical quenching （qP） of plants that were treated by 35 ℃ for 2 h all decreased, but they could resumed to approach the control level after plants were resumed for 2 hours if they were treated by 35℃ for no more than 6 h. It indicated that plants treated by sub-high temperature only for 2 h, Pn could not recover to the normal level in the same day, and it suggested the decreased Pn under sub-high temperature was mainly caused by no-stomata restriction, but stomata restriction may be the limiting factor that caused Pn decrease during the resumed period.

关 键 词：番茄 亚高温 光合作用 荧光诱导动力学参数 

分 类 号：S16[农业科学—农业气象学] S625.51[农业科学—农业基础科学]