Five Woody Plants Antagonistic Salt Stress Evolution Of Structure Is A Comparative Study

In order to research into the mechanism of resisting salt in five kinds of xylophyta under salt resistance, the relevant experiment was set about in terms of halo-tolerant anatomical structure. Researches on comparative structures were carried on Populus pseudo-simonii Kitag, Populus alba L.,Syringa oblata Lind1.,Syringa microphylla Diels and Suringa reticulata (Blume) Hara var. mandshurica (Maxim.) Hara, which were collected from different ecological environments, aiming to provide theoretical foundation for selecting salt-resisting tree breeds and improving salt and alkaline land by biological methods.All of the experiment materials come from Jilin province. Populus pseudo-simonii Kitag, Populus alba L., Syringa oblata Lindl.and Syringa microphylla Diels live in experimental field in Baicheng City, which belongs to salt environment; Populus pseudo-simonii Kitag, Syringa oblata Lindl.and Suringa reticulata (Blume) Hara var. mandshurica (Maxim.) Hara live in the campus of Northeast Normal University, which is in mesophytic habitat; Populus alba L. live in campus of Nanling Campus of Jilin University, which is also under the mesophytic habitat. Technology of paraffin slice-making and light microscopy was used in the comparative researches on these five kinds of xylophyta. The comparative structures in stems include epidermal cuticle, epidermal hairs, salt gland, cortex thickness, aerenchyma, saliferous vacuoplasts, crystal cluster, secretory canal, and vessel. Thecomparative items in leaves involve thickness of epidermal cuticle, saltgland, vein, palisade parenchyma, and spongy tissue. The items of petiole deal with epidermal cuticle, collenchyma, parenchyma, aerenchyma, vascular bundle, and vessel diameter, etc.The results of the experiment indicate that four kinds of materials under the salt environment possess salt-enduring structures on some or all of the following different aspects. The results are as follows: In the stem and petiole, cuticle thickness increases obviously; secretory canals are found in cortex; aperture of vessel is larger in vascular bundle; the cortex is thin in the stem; aqueous tissue is abundantly organized in the leaf and petiole; palisade parenchyma takes a larger proportion than spongy tissue in the mesophyll, etc. In addition, salt glands are observed on the under epidermis in the leaf of Populus pseudo-simonii Kitag and on the epidermis in the stem and leaf of Syringa oblata Lindl., and the same structure is found in the petioles of Populus pseudo-simonii Kitag and Populus alba L., which areboth special and important structures to resist the salt environment.