Combining ability and heterosis for grain Yield and its traits in mungbean (Vigna radiata (L.) Wilczek)
Loading...
Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Rajendra Agricultural University
Abstract
The present investigation was carried out at Research Farm of Tirhut College of Agriculture, Dholi, Muzaffarpur, Bihar during 2010-2011. The experimental materials comprising the sixty six genotypes (parents and crosses) including standard check (Pant M-5) were grown in RBD with three replications and observations were recorded for fourteen quantitative traits including the yield.
On the basis of genetic variability study only 100-seed weight exhibited high heritability estimates (narrow sense) coupled with high genetic advance, indicating the preponderance of additive gene action. Selection based on this trait will be rewardive. Number of secondary branches, bunches, pods per plant, number of grains per pod, pod length and 100-seed weight had shown positive and significant correlation along with their high positive direct effect with grain yield, suggesting that these parameters may be considered as prime traits during the course of selection to have the higher potential of yield in case of green gram.
Based on the higher positive and significant gca effects along with high per-se performance SML-1135 was identified as a best general combiner for yield, whereas SML-1136, SML-1137 and HUM-16 were found best general combiner for number of pods per plant, for pod length SML-1135, SML-1136 and HUM-16 and for 100-seed weight SML-1135, SML-1137 and HUM-16 indicated that these parental lines may be used in hybridization programme to have the superior recombinants for respective traits.
Only two cross combinations namely CGG-973/HUM-16 and SML-1135/SML-668 exhibited positive and significant estimates of sca effects along with high per-se performance for grain yield, suggesting that these cross combinations may be further utilized in green gram improvement programme to have the high yielding recombinants.
Two crosses namely SML-1135/SML-668 and SML-1135/HUM-16 have shown positive and significant desirable standard heterosis for grain yield, indicating that these crosses may be further exploited to have the high yielding inbreds in advance generation.