AMMI and GGE models indicating seasonal variations as major source of variations for nodulation related characters in peanut

Nodulation in peanut is an important source of nitrogen and is highly sensitive to drought stress and genotype-by-environmental interactions (GEI) play an important role in nodulation during such stresses. But very little information is available on the extent of variation in nodulation due to environment and GEI under drought stress conditions. To achieve this objective, field experiment was conducted under mid-season water stress with14 peanut genotypes using multivariate stability models such as Additive Main Effect and Multiplicative Interaction (AMMI) and GGE models. AMMI and GGE analysis identified significant environmental effect followed by genotype, and GE interactions for all nodule related traits, except for fresh nodule weight at 60 and 80 days after sowing. Present study provides statistical evidence that nodulation characters are affected by environmental factors. Study also identified PBS-14060 as stable genotype with high nodulation under water stress conditions and was recommended for inclusion in breeding programs.