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以不同叶龄鹊肾树叶为研究对象,采用常规石蜡切片技术、光学显微观察,测定其叶片厚度、表皮角质层厚度、表皮细胞厚度、栅栏组织厚度、海绵组织厚度,并对栅海比(P/S)、叶片组织结构紧密度(CTR)、疏松度(SR)等指标进行统计分析,比较干旱胁迫和复水对不同叶龄鹊肾树叶解剖结构的影响,以探讨其叶片的形态解剖特征对干旱胁迫的适应性响应机制,也为鹊肾树科学引种提供理论依据。结果表明:1面对干旱胁迫,鹊肾树各部位叶片形成了与水分环境相适应的一些解剖结构特征。叶栅栏组织细胞出现短缩现象,由1~2层增至2~3层;海绵细胞长柱状排列整齐、致密,上下表皮角质层均加厚,上下表皮出现更多的表皮毛以抵抗逆境胁迫。复水后,叶片疏松度增加,表皮毛相应减少。2对基部、中部、顶部叶片的10个解剖性状指标值进行主成分分析表明:可用上表皮角质层厚度、叶片厚度、栅海比这3个指标来描述干旱胁迫和复水对不同叶龄鹊肾树叶解剖结构的影响。3随着干旱胁迫的进行,鹊肾树叶上表皮角质层厚度和叶片厚度增大,复水后恢复正常,中部叶和顶部叶对干旱胁迫的响应灵敏度优于基部叶。
Leaf age, stratum corneum thickness, epidermal cell thickness, palisade tissue thickness and sponge tissue thickness were measured by conventional paraffin section technique and optical microscopy. (P / S), leaf tissue density (CTR) and laxity (SR) were analyzed statistically. The effects of drought stress and rewatering on the anatomical structure of magpie leaves of different ages were compared to investigate the morphological anatomy of leaves The adaptive response mechanism of the characteristics to drought stress also provides a theoretical basis for the introduction of Magpie tree science. The results showed that: 1 in the face of drought stress, magpie kidney parts of various parts of the leaves formed with the water environment to adapt to some of the anatomical features. The shortened cells in the palisade showered from 1 ~ 2 layers to 2 ~ 3 layers. The long column of sponge cells arranged neatly and densely, the stratum corneum of both upper and lower epidermis were thickened, and more epidermal hairs appeared on the upper and lower epidermis to resist the stress of stress . After rehydration, the leaf porosity increased, the epidermal hair reduced accordingly. Principal component analysis of 10 anatomic traits of basal, middle and top leaves showed that the three indexes of cuticle thickness, leaf thickness and grate-height of upper epidermis could be used to describe the effects of drought stress Effect of anatomical structure of kidney leaves. 3 As the drought stress progressed, the stratum corneum thickness and leaf thickness of the upper epidermis of magpie kidney increased and returned to normal after rewatering. The sensitivity of middle leaf and top leaf to drought stress was better than that of basal leaf.