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GENOTYPE X ENVIRONMENT INTERACTION FOR SEED YIELD IN KABULI CHICKPEA (CICER ARIETINUM L.) GENOTYPES DEVELOPED THROUGH MUTATION BREEDING

BABAR MANZOOR ATTA^*, TARIQ MAHMUD SHAH, GHULAM ABBAS AND MUHAMMAD AHSANUL HAQ

Abstract: Elite lines of kabuli chickpea developed through mutation breeding at Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad were evaluated for stability of grain yield at four diverse locations in the Punjab province during 2003-04, 2004-05 and 2005-06. The genotype yield, regression coefficient (bi), deviations from regression (S²d) with sustainability index was used to identify the stable genotypes. Analysis of variance showed highly significant differences for environment (location, year), genotype and their interactions. Genotype x environment interaction (G x E) was of crossover in type.  Mean seed yield performance in 12 environments indicated the superiority of mutant CM256/99 which produced the highest seed yield of 1349 kg ha^-1 followed by CM305/99 (1344 kg ha^-1). The CM256/99 and CM305/99 were having non-significant high bi and S²d values coupled with high sustainability index. This showed that both mutants were better responsive to the favorable environments. CM315/99 produced above average yield with non-significant unit regression and deviations from regression with highest sustainability index (75.41%). This mutant was also adapted to high performing environments. Pb.1 and CM2000 (Checks) contradict with respect to the stability parameters and the sustainability index. According to the Eberhart & Russell model of stability analysis, Pb.1 was a stable genotype but had only moderate (53.55%) sustainability index and vice versa for CM2000. So, both the Eberhart & Russell model and sustainability index cannot be considered simultaneously for predicting the stable genotypes. CM102/99 had low and non-significant bi and S²d values indicated its better response to poor environment. Pb.1, CM2000 and CM102/99 produced below average yield. The mutants CM256/99, CM305/99 and CM315/99 had shown stable performance under different locations by having above average seed yield, non-significant unit regression co-efficient along with the non significant variance due to deviation from regression.

Plant Breeding & Genetics Division, Nuclear Institute for Agriculture and Biology (NIAB), P.O.  Box 128, Jhang road, NIAB, Faisalabad, Pakistan.

^*Corresponding author e-mail: babar_niab@hotmail.com