RESEARCH THE MORPHOLOGICAL AND ANATOMICAL CHARACTERS OF COMMELINA LONGIFOLIA AND MONOCHORIA HASTATA IN LANG SEN WETLAND RESERVE, LONG AN PROVINCE

Abstract

Because of living in frequently fresh water submerged habitats, plants have developed adaptive characters to the habitats where they live. It's important to know clearly about these adaptive characters. This scientific article indicates the results of the present study about the morphological and anatomical characters of Commelina longifolia and Monochoria hastata - 2 common species in Lang Sen Wetland Reserve, Long An Province, these characters show the morphological features and adaptive anatomy to the frequently fresh water submerged habitats. We had surveyed some environmental properties, such as water pH, water electrical conductivity, depth of water, soil samples at a depth of 0-30 cm were collected to analysis some physical and chemical properties. Parts of these plants were collected and taken photos; razors were used to slice the plant samples into thin slices, the slices were double-stained according to the method of Tran Cong Khanh to observe the anatomical structure. The results of the present study show that the water where Commelina longifolia lived is neutral (pH = 6,9), besides, Monochoria hastata lived in very acidic water (pH = 3,88). Both soil samples where 2 species lived were very acidic (pH_KCl = 2,84 and pH_KCl = 3,58). There are many similar characters between 2 species, for example developed fibrous root system, vegetative reproduction by rhizomes; hairless root epidermis; in the roots, stems and leaves there are many air-charmers that help to store air.