高温对生长在加富CO2条件下水稻离体叶片叶绿素荧光的影响

EFFECT OF HIGH TEMPERATURES ON CHLOROPHYLL FLUORESCENCE OF DETACHED LEAVES OF RICE GROWING UNDER CO2 ENRICHMENT

摘要:

4个水稻品种IR72、桂朝2号、特三矮2号和Ⅱ优4480栽种于两种CO2浓度(350μL^-1、600 μl L^-1)下,将其离体叶片经不同温度(30、35、40、45、50℃)处理30 min后,其细胞膜渗漏率随处理温度的升高而上升,IR72和桂朝2号在40-45℃之间有一个急剧上升的折点,而特三矮2号和Ⅱ优4480的折点则在45-50℃之间.Fv/Fm、Fv/Fo、φPSⅡ和qP随处理温度的升高而下降,qN则先升后降。特三矮2号和Ⅱ优4480的这些荧光参数随温度的变化较IR72和桂朝2号相对平缓些。结果表明特三矮2号和Ⅱ优4480比IR72和桂朝2号有较强的抗高温能力。生长在高CO₂浓度下的水稻,叶片经高温处理后,其细胞膜渗漏率大于生长在对照空气中的叶片,但两者的叶绿素荧光参数则没有明显差别。

Abstract:

When detached leaves of four rice cultivars, IR72, Guichao 2, Tesanai 2 and II You 4480, growing under 350 μl L^-1 (ambient) and 600 μl L^-1 (enrichment) CO₂ concentrations, were treated by different temperatures (30, 35, 40, 45, 50 ℃ ) for 30 min. Results showed that the cell membrane leakage increased with increasing temperature. There was a breakpoint with significant rise in 40-45 ℃ treatments in IR 72 and Guichao 2, whereas that in Tesanai 2 and II You 4480 were between 45-50 ℃. With increasing