| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 96 === The purposes of this study were to evaluate the arbuscular mycorrhiza inoculation on the physiology of plants under salt stress. Three littoral plants, Bidens pilosa L. var. radiate, Ipomoea pes-caprae and Vitex rotundifolia, were inoculated with Scutellospoa sp. collected from sandlot in Tai-Chung Harbor (M1), and with Acaulospora sp. collected from Chu-Yun-Shan Nursery (M2), and were non-inoculated. The seedlings were irrigated with 0%, 1%, 2% and 3% sea water which is make up of sea salt, after 50 days grown in greenhouse, total biomass, nutrient concentration, proline, total soluble carbohydrate, chlorophyll and chlorophyll fluorescence of plant were then determined.
The results obtained showed that among all treatment, seedlings which irrigated with 0% sea water and inoculated with M1 had the highest biomass. Nutrient N, P and K concentration of plant tissue were decreased with salt increased, but the Na and Mg concentration increased when concentration of salt increased. Those non-inoculated seedlings showed more Na and Mg accumulated in plant tissue, but less absorption of N, P and K. The concentration of proline in the plants were slightly increased when concentration of salt increased, the concentration of total soluble carbohydrate decreased when concentration of salt increased, but there were no different of starch concentration among all treatments. Plant inoculated with M1 could accumulated more organic compounds to modulate osmosis and prevent physiological drought in high salt. When salt concentration increased, seedlings chlorophyll concentration were decreased, and the chlorophyll fluorescence, Fv/Fm, ΦPSII and qP were decreased too, only qN were increased. In conclusion, inoculated arbuscular mycorrhizal fungi could increase the plant tolerance in salt. In this study, seedlings inoculated with M1 collected from sandlot in Tai-Chung Harbor had the best performance than those inoculated with M2 collected from Chu-Yun-Shan Nursery, and those non-inoculated seedlings got the worst growth.
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