DIVERSITY ANALYSIS AMONG 31 ADVANCED LINES OF BORO RICE (Oryza sativa L.)

Abstract

An experiment was carried out at Sher-e-Bangla Agricultural University in Boro season with 31 advanced lines of Boro rice to identify the diversity among the advanced lines. The advanced lines were examined for fourteen yield and yield contributing characters. Significant variation was observed among all the advanced lines for all the characters studied. High heritability along with low genetic advance in percentage of mean were observed for number of primary branches per panicle, effective tillers per panicle, thousand seed weight and yield per hectare. Highly significant positive correlation of yield per plant observed for days to 80% maturity (0.34**), number of secondary branches per panicle (0.402**) and number of filled grain per panicle (0.565**). Path analysis indicated that, yield per plant had the highest direct effect through number of secondary branches per panicle (0.88), number of effective tiller per plant (0.77) and length of panicle (0.396). On the basis of D2-value the genotypes were grouped into five clusters. Cluster IV was the largest and containing thirteen genotypes followed by cluster I with eleven genotypes and cluster III with only one genotype. The highest inter-cluster distance was recorded between cluster I and II (110.55). The intra cluster distance was maximum (7.87) in cluster IV. The lowest inter-cluster distance was recorded between cluster II and IV (35.26). Cluster mean indicated that cluster I was important for number of effective tiller per plant (13.18), length of panicle (24.72), total number of spikelets per panicle (223.37), yield per plant (41.86) and yield per hectare (5.57). Cluster III was important for length of panicle (24.72), number of secondary branches per panicle (44.95) and thousand seed weight (29.22). Cluster V was important for early maturity (126.5, DAS), length of panicle (24.33) and total number of spikelets per panicle (235.13). Considering cluster distance and the agronomic performance, the inter genotypic crosses between (G13 and G28, G13 and G10, G12 and G21 to combine early maturity character with higher yield); (G22 and G28, G21 and G29, G24 and G10 to combine dwarf character with higher yield); (G5 and G1, G5 and G12 to combine thousand seed weight with number of spikelets per panicle) would be suitable for highest yield per plant for future breeding program. The genotypes G6, G17, G20 and G29 would be suitable for released as high yielding Boro rice variety for their short duration and high yielding characters.