摘要
以‘富士’苹果(Malus×Domestica Borkh.)幼树为试材,研究短截和拉枝处理后抽发的当年生新梢光合特性和叶绿素荧光的差异。结果表明:1)拉枝处理显著提高了叶片叶绿素含量和厚度,短截处理叶片叶面积显著高于拉枝处理和对照;2)短截处理显著提高了叶片净光合速率、蒸腾速率和气孔导度,但降低胞间CO2浓度。相反,拉枝处理提高了叶片的胞间CO2浓度,但降低了新梢叶片的净光和速率、蒸腾速率,气孔导度与对照基本相同;3)短截处理提高了叶片PSⅡ量子效率和光化学猝灭系数,降低了叶片非光化学猝灭系数,短截处理叶片PSⅡ量子效率和光化学猝灭系数在整个试验过程中显著高于其他处理,相反,叶片非光化学猝灭系数显著低于其他处理,对照组与拉90°处理叶片非光化学猝灭系数没有差异。这些结果表明,短截处理叶片PSⅡ量子效率的光合电子传递活性较大,较多的能量用于CO2同化,而用于热耗散的能量相对较少。相反,拉枝叶片PSⅡ量子效率的光合电子传递活性较低,用于热耗散的能量相对较多,而用于CO2同化能量较少。
Young ＇Fuji;（Mafus × Domestica Borkh. ） apple plants were used to study the effects of various pruning methods（Cutting back and bending） on the photosynthetic characteristics of new shoots. The results showed that branch bending significantly increased the leaf chlorophyll content and blade thickness. The cutting back treatment significantly increased the leaf Po,E and Gs,but reduced the C,. Bending treatment,on the other hand, increased the leaf Ci,but decreased Pr, and E, Gs basically the same with control group. Leaf ФPSⅡ and qP of cutting back treatment was significantly higher than that of other treatment in the whole experimental process. Little difference was found in leaf ФPSⅡ and qF＇ between control group and bending treatment. These results indicated that leaf photosynthetic electron transport activity of PSⅡ was higher in cutting back treatment. More energy was used for CO2 assimilation. The energy used by heat dissipation was relatively small. In contrast, leaf photosynthetic electron transport activity of PSⅡ was lower in branch bending treatment. More energy was used by heat dissipation, The energy for CO2 assimilationwas relatively small.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2013年第6期126-131,共6页
Journal of China Agricultural University
基金
国家自然科学基金项目(31200543)
北京市教委资助项目
关键词
苹果
短截
拉枝
新梢
光合作用
叶绿素荧光
Malus × Domestica Borkh
cutting back
branch bending
new shooh photosynthesis
chlorophyll fluorescence
