柑桔枝叶形态解剖特征与抗寒性的关系

将35个柑桔品种、类型的枝叶形态解剖观测的数值,分别与冻害级数进行相关回归分析。春梢越冬期木栓层厚度与冻害级数极显著的负相关(r=-0.9266),春叶叶面积与冻害级数呈极显著的正相关(r=0.8144),均可作为柑桔抗寒性鉴定的主要指标。春叶栅栏组织厚度与叶厚的比值与冻害级数呈极显著负相关(r=-0.5455),可作为柑桔抗寒性鉴定的重要补充指标。叶下表皮气孔密度与冻害级数呈极显著正相关(r=0.4748),可作为抗寒性鉴定的参考指标。上述指标测试较为简便且准确。

RELATIONSHIPS BETWEEN MORPHOLOGIC AND ANATOMIC CHARACTERS OF SHOOTS AND LEAVES IN CITRUS AND ITS COLD RESISTANCE

Morphologic and anatomic characters of shoots and leaves in 35 varieties and types of citrus were examined, and then correlation and regression analyses with their cold mortality (CM) were carried out. The results showed that there were a very significantly negative correlation between cork layer's thickness of spring shoots and their CM during dormant season (r=-0.0266), and a very significantly positive correlation between spring leaves' areas and their CM (r=0.8144). They can be used as major indices of cold resistant diagnoses (CRD) in citrus. There was a very significantly negative correlation between ratio of fenced tissues' thickness in spring leaves and the leaves' thickness and their CM(r=-0.5455). It can be used as an important complementary index of CRD in citrus. And there was a very significantly positive correlation between stoma density of leaves and their CM (r=0.4746). It can be used as a supplementary index of CRD in citrus. The above analysing methods are bot-simple and accurate.