Promising upland rice lines as new shading tolerant varieties with good grain quality

Abstract

The utilization of coconut plantation land to increase rice planting area is a potential effort to maintain food sustainability in Indonesia. The development of shading tolerant rice varieties has been undertaken through plant breeding programs. Preliminary yield trial of upland rice genotypes under coconut plantation with 50% light intensity have been carried out in the village of Cilincing, Tegalbulued District, Sukabumi in the WS 2017. The genotype consists of 36 rice lines 4 check varieties, i.e Inpago 8, Limboto, Situpatenggang, and Jatiluhur. The result showed that the height of the lines ranged from 70.8 cm - 111.1 cm and the number of productive tillers were between 3 - 11.9 tillers. The line B15341-1B-TB-29 showed the earliest flowering time of 83 days after sowing (DAS). The panicle length of rice genotypes ranged from 29.4 cm - 21.8 cm and the average weight of 1000 grains of the line was 25.7 g. The ranges of filled grain per panicle of the lines were 47-157 grains. B14908C-MR-1-25-1-3 had the highest amount of the number of filled grain per panicle. Amylose levels of those genotypes were in the range of 17-22% and the rice texture was sticky to medium. The shape and size of the rice were long to medium. There were six promising rice, namely B14981B-TGB-4, B15344B-TB-30, B15175C-TGB-39, B15209B-MR-17-1, B14908C-MR-1-25-1-3, and B14192E-MR-33 that have the potential to be released as new shade-tolerant varieties.