Agronomic performance evaluation and selection of doubled haploid rice lines in a lowland saline-prone area
Bambang Sapta Purwoko , Hayu Widi Yuana , Zendi Alhamami , Nono Carsono , Muhammad Fuad Anshori , Iswari Saraswati Dewi , Willy Bayuardi Suwarno
AIMS Agriculture and Food ›› 2026, Vol. 11 ›› Issue (4) : 847 -866.
Salinity stress is a major abiotic stress limiting rice productivity. The development of high-yielding and salinity-tolerant rice varieties is a key strategy for achieving global food security. Evaluation under contrasting saline field conditions is needed to validate salinity-tolerant rice genotypes. This study aimed to evaluate agronomic performance and select superior doubled haploid (DH) rice lines in yield trials in lowland saline-prone areas. The research was conducted during the 2025 dry season in two coastal areas in Indonesia-Subang (strongly saline: 1.61 dS/m) and Sidoarjo (saline: 0.62 dS/m)-using a randomized complete block design with one factor (genotypes) and three replications in Sidoarjo and two replications in Subang. The genetic materials consisted of 25 DH rice lines and three check varieties (Inpari 18, Inpari 30 Ciherang Sub1, Inpari 34 Salin Agritan). Observations were conducted on agronomic characters, including growth, phenological, yield components, and grain yield. The results showed that all observed traits were significantly influenced by genotype × environment interactions (p-values <0.01 and <0.05), indicating differential genotype responses across two environments. DH rice lines exhibited higher grain yield than the check varieties in Sidoarjo and comparable performance in Subang. Among them, GN12, GN18, and GN21 consistently outperformed the salinity-tolerant check variety, Inpari 34 Salin Agritan, across both locations. A weighted selection index enabled the identification of 14 DH lines with desirable agronomic performance in two lowland saline-prone environments, including a high number of productive tillers (23.8 tillers), a low number of unfilled grains (22.8 grains/panicle), and a high mean grain yield (6.96 t/ha) exceeding that of the check varieties. Those selected DH lines are promising candidates for salinity-tolerant rice breeding and should be further evaluated in multi-location yield trials for their yield stability and adaptability.
abiotic stress / agronomic characters / index selection / salinity rice breeding
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