摘要
采用大田和盆栽试验研究了西昌高原稻作区不同海拔高度粳稻品种的光合特性及对遮荫和温度的反应。结果表明,不同海拔高度粳稻品种的光合特性诸方面表现明显的梯度变化。在低光强下,光合速率随海拨升高而降低,在高光强下,随海拔升高而增加。光合速率和光强关系符合(?)=a+blgI曲线方程。品种原产地越高,光饱和点有越大的趋势。遮荫使高海拔品种光合产量下降更大。开花期耐冷抗冷性因海拔升高而增强。
The light-photosynthesis and the ecophysiology responese of variouskinds of keny typical rice (Oryza sativa subap, Keng Ting) at differentaltitudes to light and temperature were investigated under field cultureand pot culture conditions. The five varieties of keny rice were used:Keng No, 10, Dao No 4, Mei Dan, 79-2 and Chu Keng No.3 altitudes of2510, 2490, 2400, 2200 and 1850m, respectively. The results indicatedall photosynthetic characteristics of keny rice varieties at different altitu-des showed apparent gradient variations. Under lower intensity of illumi-nation, the photosynthetic rate at the ear-bearing stage would graduallydecrease in Keng rice varieties along with the increase in altitude. Underhigher intensity of illumination, however, the rate would gradually incr-ease along with the increase in altitude. The relationships between phot-osynthesis of Keng rice and illumination could be determined by the cur-ve equation: p=a+blgI, where p is photosynthetic rate, I is light inten-sity. The light saturation point of keng rice showed a tendency to incre-ase with the rise of altitude. The effects of shading on yield parametersof keng rice at highter altitudes were much greater than of keng rice atlower altitudes. The plateau keng rice varieties have high coldtolerancewhen different varieties exposed to low temperature at the blooming stage. The results suggested that different photosynthetic ecophysiology res-ponses to light-temperature were determined by their difference in matabo-lic pattern and adaptability to the environment.
关键词
粳稻
光合特性
海拔高度
梯度变化
Keny rice
Photosynthetic characteristic
Gradient variation
