Stability of Garden Pea Genotypes based on GGE Biplot and Regression Model

Abstract

Background: In garden pea, the availability of produce early in the season provides a premium price to the growers. Keeping this in view, efforts were made to develop varieties with stable performance across environments for early maturity and high pod yield. Methods: 48 lines were evaluated in Alpha Lattice design over 7 diverse environments ranged from sub-tropical to dry temperate conditions of north-western Himalaya during 2016-17 and 2017-18. Result: Genotypes SP-22, SP-18, SP-2, SP-17, SP-12, SP-6, and SP-3 showed earliness for days to flowering and first picking, significantly better than check Pb-89 and were also stable (S2di=0 and bi=1) except SP-6 and can be adapted to suboptimal environmental situations. The environment (E6-Kukumseri) was the most ideal for the first flowering node while E1-Bajaura for days to flowering and first picking. Mean vs stability biplot and “which-won-where” depicted SP-6, SP-22, SP-17 and SP-18 as the most stable and winning genotypes for early flowering and picking. SP-6 and SP-22 are the most promising genotypes with stable performance across environments for early maturity and high pod yield based on GGE biplot and AMMI, respectively. They could be a better alternative to the popular growing variety Pb-89 in the north-western Himalayas.