GRAIN QUALITY ASSESSMENT OF SELECTED RICE (Oryza sativa L.) GENOTYPES
Grain quality improvement has now become the primary consideration in rice breeding programs. In the present research, grain physical properties as well as nutritional quality [iron (Fe) and zinc (Zn) content] of eleven advanced rice lines with two check varieties were investigated for the estimation of the variation during the Aman season 2021. The lines EFSD-01, EFSD-66, EFSD-59, IZSD-10, IZSD-30, IZSD-44 and IZSD-67 were categorized as to produce long slender grain. The highest milling percentage and head rice recovery percentage were recorded in IZSD-67 (71.67%) and IZSD-30 (67.33%), respectively. Grain physical properties of the genotypes which showed higher heritability in broad sense and moderate genetic advance rendering them more amenable to improvement through selection than the other traits, and could be suitable for plant hybridization. First two principal components contributed up to 72.5% of the total variance cumulatively. The genotypes were grouped into five clusters and the maximum intra-cluster and inter-cluster distances were found in cluster IV and between cluster I and V, respectively. Besides, the minimum inter-cluster distance was found between cluster I and cluster V but there was no intra-cluster distance in Binadhan-20 and EFSD-01, because they were separated into a single genotype. In micronutrient estimation study, Fe content varied from 6 to 13 mg kg-1 and 0 to 7.33 mg kg-1 whereas Zn content ranged from 33.33 to 44.33 mg kg-1 and 20.33 to 27.67 mg kg-1 in unpolished and polished rice, respectively. Considering physical grain quality and Fe, Zn content, the advanced rice lines EFSD-66, IZSD-44, EFSD-59, EFSD-58, IZSD-26, IZSD-67 and IZSD-10 could be utilized in plant breeding to develop premium quality and nutrient enriched rice varieties, which in turn will ensure nutritional security in Bangladesh.
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