<![CDATA[Drought is a major constraint to rice production in upland environments; therefore, identifying genotypes with promising performance under these conditions is an important breeding objective. This study evaluated the agronomic performance of M6 brown rice mutant genotypes induced by gamma irradiation under field upland conditions. The available dataset comprised 15 entries (13 mutant lines and two check varieties) evaluated in a randomized complete block design with three replications. Ten quantitative traits were assessed, including days to flowering and harvest, plant height, total and productive tiller number, panicle length, leaf angle, filled and total grains per panicle, and 100-grain weight. Data were analyzed using analysis of variance at the 5% significance level; post-hoc comparisons were considered where appropriate. Significant genotypic effects were detected for total tiller number (P = 0.039), productive tiller number (P = 0.002), leaf angle (P = 0.006), days to flowering (P = 0.027), filled grains per panicle (P = 0.005), total grains per panicle (P < 0.001), and 100-grain weight (P < 0.001). Plant height, panicle length, and days to harvest did not differ significantly among entries. G27 1-20-19 flowered earliest (83 days) and combined a relatively high number of filled grains with a high leaf-angle value, whereas G27 1-20-6 had high numbers of filled and total grains. These entries warrant further evaluation across environments and seasons. The findings indicate agronomic potential under the tested conditions but do not, by themselves, establish drought tolerance.]]>
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