Increasing rice (Oryza sativa L.) production is essential to meet global food demands amidst population growth, climate change, and limited agricultural resources. However, higher production paired with increased fertilization reduces fertilizer efficiency in rice crops, raises production costs, and negatively impacts the environment. The green super rice (GSR) ideotype’s development was successful in achieving high productivity with low input, tolerance to abiotic stress, and resistance to biotic stress. The technology of anther culture and mutation can be helpful in accelerating the development of new varieties. This study aimed to evaluate agronomic characters and the tolerance of double haploid (DH) lines derived from the Inpari 42 Agritan GSR mutant under low fertilization dosage. The experiment arrangement was in a split-plot design, with fertilizer dosage as the main plot (1/3 dosage, 2/3 dosage, and recommended dosage) and genotypes as the subplot (16 DH lines and two check varieties, which are Inpari 42 and Inpari 45). The recommended dosage of fertilizer had the highest productivity; however, it was not significantly different from the 2/3 dosage of fertilizer. Based on MGIDI selection, the DH lines MS36, MS42, MS45, MS46, and MS51 emerged as promising lines with better yield components and productivity and tolerance index values under the 2/3 fertilizer dosage.
Green super rice (O. sativa L.), anther culture, fertilizer efficiency, MGIDI, tolerance indices, grain yield
Reducing fertilization in rice (O. sativa L.) cultivation is a feasible strategy to lower production costs and minimize environmental impact. Based on MGIDI selection, five double haploid lines were selected due to better productivity, yield components, and tolerance index values than the parent under a 2/3 fertilizer dosage.