Swampy rice lines for iron toxicity tolerance and yield components performance under inland swamp at Sorong, West Papua, Indonesia

Abstract

Abstract. Maruapey A, Wicaksana N, Karuniawan A, Utami DW, Windarsih G. 2020. Swampy rice lines performance for iron toxicity tolerance and yield components under inland swamp at Sorong, West Papua, Indonesia. Biodiversitas 21: 5394-5402. The extensification of sub-optimal lowland farming strategy is expected to support the increase of rice production. Based on the efforts, the development of tolerant rice varieties to Fe-toxicity to be used in the swampy land area is one of the approaches for increasing rice production. Currently, promising rice lines that are tolerant to Fe-toxicity has been developed using molecular breeding approach for inland swampy area. The objective of this research was to evaluate the performance of 15 promising rice lines that have various genetic backgrounds in inland swamp in Sorong, West Papua. The field experiment was conducted during the second rice planting season (August 2018 to February 2019) to evaluate the performance of the promising rice lines to the morpho-agronomic performance under the lowland swamp conditions. The trial was laid out in a Randomized Complete Block Design (RCBD) consisting of 4 m x 5 m square plots, with 25 cm x 25 cm planting distance and 3 replications. The results revealed that most of the lines had good performances on the Fe-toxicity tolerance, based on bronzing, root length, and biomass characters. The G1 line had the best performance on yield component characters, especially the panicle length. This line also had the highest grain yield (6.15 ton.ha-1) followed by the next promising line of G7 (5.92 ton.ha-1). The genetic performance of these lines showed that they contained IRT (Iron Regulation Transporter) alleles that contributed to partitioning the Fe tolerance mechanism.

The Sustainability Index and Other Stability Analyses for Evaluating Superior Fe-Tolerant Rice (Oryza sativa L.)

“…The genetic materials used include 15 new Fe-tolerant rice genotypes (Table 1). The rice genotypes tested were the result of selection with varying degrees of Fe tolerance [49]. These genotypes resulted from a plant breeding program at the National Research and Innovation Agency, Indonesia.…”

Fertilization and Amelioration Method to Increase Rice Productivity in Tidal Swamp Land Type C on The Border of West Kalimantan-Malaysia

“…The development of rice cultivation in the tidal swamp land at the border has faced low productivity due to the low quality of the land and farmers' knowledge of rice cultivation [1]. Tidal swamp land has been reported by several researchers to have low fertility levels [2], characterized by low pH, low levels of N, P, and base element, while the levels of toxic elements such as Al [3] and Fe were relatively high [4]. Another issue is the threat of pyrite oxidation if the water layer is below the pyrite layer [5].…”

Responses of red rice paddy under low nutrient supply in type B tidal swamp

“…The suboptimal land area in Indonesia is estimated at 123.1 million ha of dry land and 33.4 million ha of swamp land. Based on the existing swamp area, 20.1 million ha (60.2%) is tidal land 1,2 . The main obstacles faced in cultivating rice plants in low tides are the water system that is still not controlled, the high content of Fe elements, and the availability of nutrients 3,4 .…”