| Summary: | 碩士 === 國立臺灣大學 === 植物學系 === 85 === 8-day-old soybean seedlings were grown in hydroponics and in
vermiculite system. Soybean which grow in hydroponics system was
dried in air for 12 hours. Soybean which grow in vermiculite was
treated with withholding water for 1, 2 and 3 days. After
treatment, roots and leaves were harvested and water potential,
fresh weight and dry weight were measured.Plasma membrane
isolated from roots and leaves were purified by using two-phase
partition method, and then assayed their ATPase activity,
components of lipids and acyl side chains of lipids. The ATPase
activity of vermiculite-growing soybean plants were higher than
that grown in hydroponics. Water stress reduced the ATPase
activity ofroots both in vermiculite-growing and hydroponics-
growing plants. The ATPase activity of leaf was not reduced in
hydroponics-growing soybeans after water-stress treatment. The
ATPase activity was reduced after withholding water 2 days in
vermiculite-growing soybean seedlings.The lipid quantity of
plasma membrane was reduced by water-stress. Lipid composition
of plasma membrane were changed. The lipids contained less
unsaturated fatty acyl chains after water-stress treatment.
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