EVALUATION OF BIOLOGICAL AND AGRONOMIC CHARACTERISTICS OF NEW SALT-TOLERANT RICE LINES

Abstract

The study evaluated the morphological and agro-biological characteristics of six newly developed rice lines at the BC₃F₄ generation, derived from a cross between the parental varieties Trang Cut and Bac Thom No. 7. The experiments were conducted during the Spring and Summer -Autumn seasons of 2024. The results showed that all rice lines exhibited short growth duration and most morphological, biological and agronomic traits, as well as yield-contributing components, were comparable to those of Bac Thom No. 7. Four lines (PT1, PT2, PT5, PT6) had bright yellow husks, differing from the brown husks of Bac Thom No. 7 and were taller by 2 - 10 cm, with growth duration extended by 2 - 7 days. Among them, PT1 and PT2 achieved the highest actual yields in both seasons (5.7 - 6.9 tons/ha), exceeding the control variety Bac Thom No. 7 by 16.3 - 35.3%. All tested rice lines/varieties demonstrated good resistance to major field pests and diseases. Based on the overall results, the PT1 and PT2 lines were selected for further evaluation in subsequent seasons and across different ecological regions to assess their adaptability under production conditions.