Year 2002
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Item GENETIC STIDIFJS ON EDIBLE POD YIELD IN F2 DIALLEL POPULATION OF LABLAB BEAN (Lablabpurpureus L.)(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA, BANGLADESH, 2002-11) RAHMAN, JAM ILURA 6 x 6 F2 diallel experiment (without reciprocal) on Lablab bean (Lablab purpurezt L.) was conducted to study combining ability and inheritance in some selected genotypes for pod yield and other related characters such as flowering, pod setting, no. of inllorescences per plant, no. of flowers per inflorescence, no. of pods per inflorescence, inflorescence length, pod length, pod width, 10-pod weight and 20-seed weight. There were significant variations among the genotypes for all the characters studied. Variances for general combining ability (gca) and specific combining ability (sea) were significant for ten out of eleven characters including pod yield per plant, suggesting the presence of both additive and non-additive components in the genetic systems of these characters. For days to l' flowering and I St pod setting, the genetic system was predominantly of non-additive gene action. The parental genotype DS-52 was found to be the best general combiner for early flowering, pod setting and 20-seed weight. The parent DSN-26 was the best general combiner for inflorescences per plant, pod length, pod width, 10-pod weight and also for pod yield per plant. For sea effect the cross DS-52 x DS-161 and DS-30 x DSN-26 were the best specific combiners for early flowering and early pod setting. For 10- pod weight and pod yield per plant the cross DSN-26 x KBS-3 and DS-30 x KBS-2 were the best specific combiners. Vr-Wr analysis relating to graphical presentation of major genetic features were done for all the eleven characters. Complete dominance was observed for pod yield per plant, partial dominance for no, of flowers per inflorescence, pod length, 10-pod weight, and 20-seed weight. While overdominance was recorded for days to l flowering, days to 1M pod setting, no. of infloreseenees per plant, no. of pods per inflorescence, inflorescence length and pod width. Components of variation and various genetic parameters such as degree of dominance, dominance ratio, narrow sense heritability etc. were estimated. Results showed that positive and negative alleles were in unequal proportion among the parents for all characters. The dominant alleles were in excess for all characters except pod length, pod width and 20-seed weight. Dominant and recessive genes were unequally distributed in the parents for all characters. High narrow sense heritability was observed for pod yield per plant and 10-pod weight, whereas for the others it was moderate to poor.Item MIXING ABILITY AND INTER.-GENOTYPIC COMPETITION FROM 7x7 UNIBLENDS AND BIBLENDS OF SOYBEAN GENOTYPES(DEPARTMENT OF GENETICS AND PLANT BREEDING, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA, BANGLADESH, 2002-11) MAIIMUD, FIROZMixing ability and inter-genotypic competition from 70 mechanical diallel mixtures excluding reciprocals of Soybean (Glycine mat L.) were studied, during November 2001-April 2002, under two experimental sets which provided for intra-row and interrow mixing of genotypes in biblend, designated respectively as Set I and Set 11, as well as uniblend stand in both. The significant differences among the genotypes were found for all the traits examined. The mean performance analysis showed that, the genotype PM-78 had earliness for flowering and maturity, and the biblends PM-fl + Ramsom and BS-3+ 85-16 exhibited earliest flowering and maturity behaviour. The genotype G-2 showed the best performance for pods/plant, seeds/plant, yield/plant, biological yield/plant, and yield/plot. Variances due to general mixing ability (GMA) and specific mixing ability (SMA) were significant for most of the traits. The predominant role of OMA variances were affirmed in all the characters studied. The genotype PM-iS was found to be the best general mixer for earliness in flowering and maturity in both experimental sets. The genotype BS-16 was found to be a good general mixer for plant height, branches/plant, yield/plant, biological yield/plant, and yield/plot in both the experimental sets. The genotype G-2 had a good mixing ability for pods/plant, seeds/S-pods and seeds/plant in the both experimental sets. Whilst the genotype BS-60 was found to be a good general mixer for harvest index in both experiments, as revealed by thcir respective uniblend stand. The mixture (biblend) BS-60 + 85-16 was earliest in flowering and maturity. The plant mixture BS-3+BS-16 was found to be a good specific mixer for plant height, branches/plant, pods/plant, seeds/plant, yield/plant, biological yield/plant, and yield/plot in experimental Set-I. But in experimental Set-Il, the mixture P13-l+BS-16 was found to be a good mixer for branches/plant, pods/plant, seeds/S-pods, seeds/plant, yield/plant, biological yield/plant, yield/plot and 100-seed weight. For experimental Set I, the biblend BS-3+BS-16 and for experimental Set lithe biblend PB-I +BS-1 6 were the best specific mixers.