| The saline-alkali stress resistance experiment was carried out using the saline-alkali resistant Glycine max (L.) Merr. cultivars, provided by the Soybean Research Institute of Heilongjiang Province Agriculture Academy, in order to explore the salt resistant structure characteristics. This experiment studied the salt resistant anatomical structure and the relationship between plant structures and its environment. This study can be helpful for the future screening of salt resistant soybean breeds. Six soybean cultivars (II4, Lf1, HG11, GDPM, gMXD, hL11) treated with salt stress were paraffin sectioned. Using light microscope, the following salt resistant structures were comparatively observed. In roots: primary xylem prototype, pith, vessel, vessel aperture, pore sorts, paratracheal parenchyma, vascular ray, etc. In stems: vascular bundles, pore cluster, phloem fiber, salt glands, epidermis horny layer, saline vacuole bag, collenchymas, etc. In leaves: blade thickness, principal vain, mesophyll, salt gland, etc.The studies showed that salt resistant soybeans have developed mechanical tissue, conducting tissue, assimilating tissue. Six cultivars all have salt glands, with similar structure of that found in Glycine sofa Seib. et Zucc. The salt glands comprise head celk and handle cells. Stomata guard cells are semilunar shape and infossate. Substomatic chambers are large. There are saline vacuole bags in cortical cells. Summing up all the structures of each cultivar, all the soybean cultivars display salt resistance while gMXD having more salt resistant characteristics. |
