An experiment was conducted with 7 parents of different origin to assess combining ability among the 7X7 diallel crosses. Twenty eight genetic populations (F1s and parents) obtained from a 7X7 diallel cross excluding reciprocal were used in the study of physiological parameters. The date of sowing was 1st May 2005 at Jute Agriculture Experimental Station, Bangladesh jute research Institute, Manikgonj, Bangladesh. Results revealed that a 7X7 diallel cross (excluding reciprocals) of jute indicated that both additive and non-additive gene effect controlled the expression of NAR, LAI and leaf angle but dominant components involved in CGR, RGR and HI. Additive and non–additive genetic components were concluded on the basis of σ2 g: σ2 s rather than GCA MS: SCA MS. Considering all these physiological traits, O-72 and JRO-524 could be considered as potential combiners which could be used in future hybridization program. Only cross O-9897 X SDLT2 was the best specific combiner for NAR, CGR, and RGR while cross O-72 X JRO-524 was the best combiner for CGR, RGR, LAI and also leaf angle and average SCA performer for NAR and HI. Importantly, the cross O-72 X JRO-524 had significantly superior SCA values which could be exploited to generate transgressive segregates having good yield potentiality for physiological efficiency.
Tossa jute, GCA and SCA NAR, RGR, CGR. LAI
