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Rina Hapsari Wening,Indrastuti Apri Rumanti,Bambang Sapta Purwoko,Willy Bayuardi Suwarno,Nurul Khumaida 한국육종학회 2019 Plant Breeding and Biotechnology Vol.7 No.4
Flooding often occurs during the vegetative stage in freshwater swamps and rainfed lowlands, and therefore submergencetolerant rice varieties are needed. This study was aimed at evaluating rice lines to submergence stress. The experiments wereconducted at ICRR experimental station in Sukamandi, Subang, West Java, each in different environmental conditions: (1) submergencecondition, which was conducted in a submergence pool and (2) optimal condition, which was conducted in the irrigationfield. Ninety-five lines and four check varieties, namely Inpari 30 Ciherang Sub1, IR42, Limboto, and IR20 were used. An augmenteddesign with five blocks was followed in each environment. Three selection methods were used: (1) selection based on survival rate andvigor, (2) selection based on productivity under submergence and sensitivity index on productivity character, (3) selection based on theweighted selection index using sensitivity index variables of morphological and agronomic characters. The clustergram analysis withheatmaps method was used to compile of three previous selection methods to facilitate scientist in clarifying tolerant and sensitive lines. There were eighteen lines selected as tolerant to submergence stress, i.e., line no. 9, 15, 34, 46, 47, 48, 49, 50, 53, 55, 56, 57, 59, 60, 61,62, 89, and 90. These lines are considered promising for breeding improved rice varieties tolerant to submergence.
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