Grain yield and aroma quality of upland rice (var. pare wangi) under various types and periods of drought stress

Abstract

Abstract. Arsa IGBA, Ariffin, Aini N, Lalel HJD. 2017. Grain yield and aroma quality of upland rice (var. pare wangi) under various types and periods of drought stress. Trop Drylands 1: 17-23. Rice with unique aroma is often preferable and this trait can be achieved through exposing rice plants to drought and salinity stresses. Yet, particular rice varieties might respond differently to such stresses. The objective of this study was to evaluate the effect of type and period of drought stress on grain yield, physiological characters and aroma quality of aromatic Pare Wangi upland rice variety. Two-factor experiment was conducted in a greenhouse employing a Completely Randomized Design with three replications. The first factor was type of drought stress and the second factor was plant growth stage at which drought stress period was started. Observed data included yield components and grain yield pot^-1, physiological characters, and aroma quality. Observed data were subjected to analysis of variance, HSD post hoc test, and simple correlation analysis. The research results indicated that the salinity stress effect of 2.0 g NaCl kg soil^-1 caused a higher percentage of unfilled grain as compared to that of other types of stresses. When the salinity stress was started at the booting stage, the chlorophyll content of the rice plants was lower than that of other stresses. Soil moisture stress of 75% FC that was started at booting stage produced the highest 2AP content and aroma quality. Proline content was not significantly correlated with 2AP content but it showed a positive correlation with grain yield pot^-1.