SISTEM PERTAHANAN TANAMAN KEDELAI YANG MENDAPAT PERLAKUAN CEKAMAN KEKERINGAN

Abstract

Defender system of plant to drought application were observed on 3 cultivated soy beans (Glycine max L.), and wild soybean (G. tomentella). The study was designed to exa mine relative water content (KAR) and antioxidant enzyme activity of soybean exposed to drought stress. Plants were grown in 8 kg pot containing soil and sand (1:1, v/v) in the greenhouse. Drought stress was provided by withholding water for 12 days (cultivated soybean) and 22 days (wild soybean). Observation was carried out by measuring media water content (KAM), KAR, and antioxidant enzymes activity. The drought caused dec rease of KAM and KAR of all plants. Antioxidant enzyme activities generally increased in response to drought until 10 days of the treatment, and then decreased when leaf KAR dropped below 50% (12 days after drought stressed for cultivated soybean and 18 days for wild soybean).

Keyword: drought, KAR, antioxidant enzyme