不同钙素水平对设施油桃叶片光合作用的影响

Effects of Different Calcium Levels on Leaf Photosynthesis of Nectarine under Proteced Culture

以设施油桃中油5号为试材,研究了不同钙素水平(0、2、4、6、8、10mmol/L)对设施油桃新梢长度及叶片光合作用的影响。结果表明:随施钙水平的提高,设施油桃新梢长度,叶片叶绿素a、叶绿素b、叶绿素a+b、叶绿素a/b、净光合速率、蒸腾速率、气孔导度、胞间CO2浓度均表现为先升高后降低,并且均在Ca2+8 mmol/L时达到最大值,与不施钙处理相比差异达显著水平(P<0.05)。不同水平的施钙处理均能显著促进设施油桃新梢生长,改善叶片的光合作用。

Abstact. The effects of different calcium levels on new shoots and leaf photosynthesis of necta- rine under protected cultivation were studied by using 3-year-old nectarine（Prunus persica vat. nectariana cv. Zhongyou 5）. The results showed that the different levels of calcium significantly improved the length of new shoots and leaf photosynthesis. The length of new shoots ,the chloro- phyll contents, net photosynthetic rate （ Pn）, stomatal conductance （ Gs）, transpiration rate （ Tr）, and intercellular CO2 concentration（Ci） all increased firstly and then decreased with the increasing of calcium levels. These indices reached maximum at 8 mmol/L,which had significant differences （P〈0.05） compared with calcium-free treatment.