矮牵牛耐盐的形态结构研究

对矮牵牛的茎、叶形态结构进行了研究,以探索矮牵牛耐盐的结构本质,为耐盐植物选育及盐碱滩涂资源的利用提供参考.结果表明:矮牵牛茎腺毛密度可达到19个/mm,为叶腺毛密度的4倍多,腺毛长度在200～300μm之间,顶端细胞具有分泌细胞的特点.表皮细胞排列紧密,角质层厚度达4～9 μm.茎中皮层和髓比例较大,维管束排列紧密,导管密集.叶栅栏组织有2～3层柱状细胞,为海绵组织厚度的1.3倍.叶片有较大的气孔下室,气孔密度小,在44～69个/mm2之间.这些形态结构有利于矮牵牛适应盐渍干旱环境,是矮牵牛耐盐的基础.

Study on Salt-tolerant Morphology of Petunia hybrida

The morphological characteristics of the stem and leaf of Petunia hybrida were studied,in quest of salt-tolerant the morphology of Petunia hybrida to provide reference to sact-tolerant plant selection and resource utilization to saline lands.The results showed that glandular hairs on stem reached the density of 19/mm2,the number of glandular hairs on stem had more than four times on leaf,length of glandular hairs varied between 200 μm and 300 μm,apical cell of glandular hairs were characteristic secretory cell.Epidemic cells was compact,thickness of corneous layer have 4~9 μm.Pith and cortex having greater proportion,close vascular bundles,dense vessel were observed in the transverse section of the stem.There were 2~3 layers of long-column-shaped palisade tissue under the upper epidermis and the ratio of the thickness of palisade to spongy was 1∶3.There were greater substomatic chamber,smaller stomata density in the leaf.And stomata density varied between 44 and 69/mm2.The morphology may to endure saline and drought conditions.The morphology of Petunia hybrida was also its salt-tolerant foundation.