EFFECTS OF NAPHTHALENE ACETIC ACID AND GIBBERELLIC ACID ON PLANT PHYSIOLOGICAL CHARACTERISTICS OF WAX APPLE (VAR. JAMBU MADU)

Siti Zuriani Ismail, Mohammad Moneruzzaman Khandaker, Izzati Awang

Abstract: The study was conducted to investigate the effects of napthalene acetic acid (NAA) and gibeberellic acid (GA3) on plant physiological characteristics of Syzygium samarangense (wax apple) var. jambu madu. Different concentration was used in NAA and GA3 treatments where NAA at 10, 20 and 40 mg/L and GA3 at 20, 40 and 80 mg/L. In GA3 treatment, the result shown that application of 40 mg/L concentration gives the best result while, 10 mg/L and 20 mg/L treatments were the best concentration for NAA application to improve the plant physiological characteristics of Syzygium samarangense leaves. In addition, GA3 treatment had shown significant effect on new leaf length, petiole length, chlorophyll b, carotenoid content and stomatal conductance. NAA treatments had shown significant effects on petiole length, chlorophyll content (SPAD), chlorophyll
b, carotenoid content and photosynthetic rate of leaf. It can be concluded that 40 mg/L GA3 and 10 and 20 mg/L NAA treatments significantly improved the physiological characteristics wax apple plants under field conditions.

Keywords: gibberellic acid; naphthalene acetic acid; physiological characteristics; wax apple

Date published: 2017-07-07