摘要
对茄子嫁接苗与自根苗的光合生理特性进行了比较研究.结果表明,不同时期嫁接苗功能叶片的净光合速率(Pn)均显著高于自根苗;茄子嫁接苗与自根苗功能叶片的Pn日变化均呈“双峰”曲线,但嫁接苗的“午休”程度较自根苗轻;嫁接苗比自根苗有较低的光补偿点(LCP)和CO2补偿点(CCP),较高的光饱和点(LSP)和CO2饱和点(CSP);有较低的光合冷限温度和较高的光合热限温度,光合最适温度两者之间没有明显的差别;有较高的光饱和、CO2饱和及最适温度时的Pn;嫁接苗Pn高是因为嫁接苗胞间的光合反应的底物浓度大(C i高),表观量子效率(AQY)、羧化效率(CE)和光合能力(A350)高的缘故.
The capabilities of grafted seedling and scion-root seedling of eggplant were comparatively studied. The results showed that the functional leaves of the seedlings grafted at different growth states presented a significantly higher net photosynthetic rate than those of the scion-root seedlings ;the photosynthetic rates of the grafted seedlings and scion-root seedlings appeared to change in a double-peak curve ,but the grafted seedlings had a lighter noon break than the scion-root seedlings ;the grafted seedlings presented lower light compensation point,lower C（）z compensation point but higher light saturation point and higher CO2 saturation point than the scion-root seedling;the grafted seedlings had a lowest photosynthetic temperature and a highest photosynthetic temperature than the scion root seedlings,the optimal photosynthetic temperatures of the two types of eggplant seedling showed no remarkable difference ;the grafted seedlings had higher net photosynthetic rates at the light saturation point and CO2 saturation point and optimal temperature ; the reasons why the grafted seedlings had a higher net photosynthetic rate were higher intercellular substrate concentration,higher apparent quantum yield ,higher carboxylation efficiency and higher photosynthetic capacity of photosynthesis.
出处
《西北植物学报》
CAS
CSCD
北大核心
2005年第9期1879-1883,共5页
Acta Botanica Boreali-Occidentalia Sinica
关键词
茄子
嫁接苗
自根苗
光合特件
eggplant
grafted seedling
scion-root seedling
photosynthetic capability
