Identification of Novel Submergence Tolerant Local Rice Cultivars of Bangladesh

Abstract

Bangladesh had harbored numerous submergence tolerant rice local cultivars or landraces (popularly known as Joli Aman). As the local cultivars endure intervallic flash-flooding year after year, it is presumed that genes/Quantitative Trait Loci (QTLs) that give resilience are probably going to be available in these genotypes. In submergence screening, the performance of three tested accessions (Lakhi, Atshotti and Damsi) demonstrated them to be as tolerant as the check FR13A. Other germplasm accessions (DSL-78-8, Laldepa, Putidepa, Laxmi digha) performed great recuperation capacity after de-submergence. Damsi, Rajasail, Haloi, Lal Digha, Manik Digha, Bhawalia, DSL-78-8, Putidepa, Atshotti and Jalda IRRI don't have the SUB1 QTL and furthermore not like the BR5, a submergence susceptible check variety. Bajal, Horkoach, Pathornuti, Laxmi Digha, Horinga Digha, Bhawalia Digha and BR5 was not amplified by Gns2 conferring SUB1 QTL (submergence tolerance specific QTL). Significantly, the local cultivars i.e. DSL-78-8, Putidepa and Sadadanga boro were identified as having better submergence tolerance however having no resistant alleles of GnS2 and Sub1C173, indel markers specific to SUB1 QTL. The result of molecular screening revealed new submergence tolerant rice cultivars which do not possess SUB1 QTL. To discover new submergence tolerant QTLs other than SUB1 through QTL mapping, newly identified submergence tolerant germplasm can be utilized.