摘要
为探讨夜间亚低温对番茄叶片光合作用影响的生理机制,研究了9℃夜间亚低温处理及恢复条件下番茄叶片净光合速率(Pn)和叶绿素荧光参数的变化。结果表明:夜间9℃亚低温处理3d以上,叶片Pn、PSⅡ最大光化学量子产量(Fv/Fm)、PSⅡ潜在的活性(Fv/Fo)、实际光化学量子效率(ΦPSⅡ)、PSⅡ的电子传递速率(ETR)、光化学猝灭系数(qP)均下降,初时荧光(Fo)、PSⅡ的还原状态(1-qP)、非光化学猝灭系数(NpQ)均提高;但夜间9℃亚低温处理9d以内,除了NpQ在9d恢复性处理后仍未恢复到对照水平外,其它叶绿素荧光参数均恢复到对照水平。上述结果说明:9℃夜间亚低温处理3d就明显引起番茄成熟叶片光合作用的光抑制,而9d以下的夜间9℃亚低温处理对PSⅡ的影响是可逆的,即短期9℃夜间亚低温所引起的番茄叶片光合作用的光抑制现象是可以恢复的。
In order to discuss the physiological mechanism of effect of sub-low night temperature on photosynthesis in tomato leaves, the change of net photosynthetic rate （Pn） and chlorophy Ⅱfluorescence paramerers of tomato leaves under the condition of sub-low night temperature at 9℃ for 3 - 9 days and then recover for 9 days at optional temperature were studied. Treated with sub-low night temperature at 9℃ for more than 3 days, it was shown that the net photosynthetic rate （Pn）, the maximum photochemical efficiency （Fv/ Fm）, potential activities of PS Ⅱ （Fv/Fo）, the actual photochemical efficiency of PS Ⅱ reaction center （ФPS Ⅱ ）, rate of electronic transmission of photosynthesis （ ETR）, photochemical quenching coefficient （qP） of leaves deceased, while intrisic fluorescenc of （Fo）, the relative reduction state of PS Ф （1 -qP） and the non-photochemical quenching coefficient （NpQ） increased. But when tomato leaves were treated with sub-low nigth temperature for less than 9 days and then recovered for 9 days, most chlorophyll fluorescence parameters could come back to control, except NpQ. These results showed that the phenomenon of photoinhi- bition of photosynthesis in tomato mature leaves has been induced obviously after treated with sub-low night temperature at 9℃ for 3 days, and that it was reversible that the effect of treatment of sub-low night temperature at 9℃ for less than 9 days on PS Ⅱ. Namely, the phenomenon of photoinhibition of photosynthesis in tomato leaves induced by short-term 9℃ sub-low night temperature could recover.
出处
《园艺学报》
CAS
CSCD
北大核心
2008年第7期1003-1010,共8页
Acta Horticulturae Sinica
基金
国家科技支撑计划项目(2006BAD07B04)
辽宁省重大科技攻关项目(2006215001)
关键词
番茄
低温
恢复
光合作用
光抑制
tomato
low temperature
recovery
photosynthesis
photoinhibition
