摘要
以不同树龄(1龄、2龄、4龄)桐花树(Aegiceras corniculatum)的成熟叶为材料,采用石蜡切片法和显微观察法,对叶片形态和组织结构进行了比较研究。结果表明:树龄对桐花树的叶片形态和组织结构均有显著的影响,随着树龄的增大,叶面积呈增大趋势,且4龄树的叶面积显著大于1龄和2龄,比叶重基本不变,而叶片长宽比则呈减小趋势;叶片的栅栏组织厚度、海绵组织厚度、叶片组织结构紧密度和疏松度均呈先降后升趋势,且4龄树的叶片组织结构密度和疏松度显著增大;成熟叶上、下表皮细胞大小变化不大;上表皮角质层逐年增厚,而下表皮角质层逐年变薄;盐腺细胞则显著增大。
The morphology and organizational structure of mature leaves of different ages （1 year, 2 year and 4 year） of Aegiceras corniculatum plants were comparatively studied by adopting paraffin section method and microscopic observation. Results indicated that leaf area increased with plant age, namely the average leaf area of 4-year plants was significantly larger than those of 1-year and 2-year plants, whereas the specific leaf weight remained basically unchanged and the leaf length to width ratio demonstrated a trend of reduction with plant age; as the plant age of A. corniculatum increased from 1-year to 2-year and to 4-year, the thickness of palisade tissue and sponge tissue, the organizational structure closely degrees and organizational structure loose degrees all demonstrated a trend of declining first then rising again, so that the organizational structure closely degrees and organizational structure loose degrees of 4-year plant leaves were significantly larger than that of the younger plants. No significant difference was observed between the size of upper epidermal cells and lower epidermal cells; the cuticle thickness of upper epidermis increased with plant age, whereas the cuticle thickness of lower epidermis decreased with plant age; the slat gland cells significantly enlarged with plant age. The results indicated that plant age had significant effect on leaf morphology and organizational structure of A. corniculatum.
出处
《广东农业科学》
CAS
2015年第9期23-27,I0001,共6页
Guangdong Agricultural Sciences
基金
广东省科技计划项目(2010B031900044)
关键词
桐花树
树龄
叶片形态
组织结构
Aegiceras corniculatum
plant age
leaf morphology
organizational structure
