PREDICTION AND VALIDATION OF THE FREQUENCY OF RECOMBINANT INBRED LINES SURPASSING PRE-DETERMINED STANDARDS FOR QUANTITATIVE TRAITS IN DOLICHOS BEAN(LABLAB PURPUREUS L. SWEET) VAR. LIGNOSUS

M.S. SHIVAKUMAR¹*, S. RAMESH², SURESH³, B.M. SHOWKATH BABU⁴, C.M. KEERTHI⁵, M. BYREGOWDA⁶, A. MOHAN RAO^7
1 Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences (UAS), Bengaluru, India
²Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences (UAS), Bengaluru, India
³Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences (UAS), Bengaluru, India
⁴Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences (UAS), Bengaluru, India
⁵Department of Genetics and Plant Breeding, College of Agriculture, University of Agricultural Sciences (UAS), Bengaluru, India
⁶All India Coordinated Research Project (AICRP) on Pigeonpea, UAS, Bengaluru, India
⁷All India Coordinated Research Project (AICRP) on Pigeonpea, UAS, Bengaluru, India
* Corresponding Author : shivakumarms.gpb@gmail.com

Received : 22-03-2016     Accepted : 25-03-2016     Published : 28-05-2016
Volume : 8     Issue : 18       Pages : 1325 - 1328
Int J Agr Sci 8.18 (2016):1325-1328

Keywords : Dolichos bean, Prediction, Recombinant Inbred Lines, Validation
Academic Editor : Prakash I. Gangashetty
Conflict of Interest : None declared
Acknowledgements/Funding : Senior author gratefully acknowledge Indian Council of Agricultural Research (ICAR), New Delhi for awarding Senior Research Fellow (SRF) for carrying out PhD thesis research. The present reported work is a part of the PhD thesis research.
Author Contribution : None declared

Development and use of an objective criterion for selecting a few potential crosses to maximize the frequency of superior pure-lines would help increase the pace and efficiency of any self-pollinating species with Dolichos bean being no exception to this. Probability of RILs that transgress the parental and/or any pre-determined rangecan be predicted based on additive [d], additive × additive epistatic gene effects [i] and additive genetic variance (σ2A) estimated in initial selfing and/or backcross generations derived from a cross. An investigation was conducted to predict and validate the frequency of F5 RILs derived from HA 10-8 × RIL 180 that surpass the limits of their parental phenotypes and of check variety, HA 4 for nine quantitative traits.A fairly good agreement was observed between observed and predicted frequency of RILs that transgressed higher scoring parent only for primary branches plant-1. On the other hand, good agreement was noticed between observed and predicted frequency of RILs that transgressed the lower scoring parent for dry pod yield plant-1 and 100-dry seed weight. The agreement between predicted and observed frequency of RILs that transgressed either of the parent was rather poor for plant height, primary branches plant-1, racemes plant-1, raceme length, dry pods plant-1 and dry seed plant-1. The poor agreement between predicted and observed frequency of RILs for these traits was attributed to linkage disequilibrium between the genes controlling these traits.