Seedlings and Vegetative Stage of Red Rice as Affected by Induction Gamma-Rays under Saline Stress

Abstract

The selection of plant varieties and the proper gamma dosage will affect germination and nutrient absorption. The goal studies were: (1) to obtain the salinity-tolerant red rice varieties and (2) to obtain the effect of varieties, gamma doses, and their interactions that could be improved the seedling characteristics and nutrient absorption in the vegetative phase of red rice plants under saline stress. The study was conducted at the greenhouse of Growth Center, LLDIKTI-1 Medan, from September until October 2020. This study used a Split Plot Design with the main plot of red rice varieties (V1 = MSP-17, V2 = Inpari-24 Gabusan, V3 = Pamera, V4 = Pamelen; and V5 = Inpara-7) and sub-plot was the gamma doses (0; 100; 200; 300; 400; 500; 600; and 700 Gy) within three replicates. The parameters were analyzed using ANOVA and set up by DMRT at P < 0.05 with IBM SPSS. The results showed that the varieties significantly affected seedling characteristics and nutrient absorption in the vegetative phase of red rice plants under saline stress. The MSP-17 variety had the greater vigor index, N, K+/Na+, and proline levels and it was classified as saline-tolerant. The low dose of gamma rays (100-200 Gy) could be improved root length and volume, as well as the levels of N, K, and proline of red rice plants were 3.77; 1.95; 8.62; 7.69; and 4.87% compared to the control. The interaction of the MSP-17 variety at low-dose gamma irradiation (0-300 Gy) enhances the greater performance of red rice plants under saline stress.

Keywords

• gamma dosage
• nutrients
• proline
• selection
• varieties