GENOTYPE-ENVIRONMENT INTERACTIONS AND STABILITY ANALYSIS OF YIELD AND YIELD ATTRIBUTES OF TEN CONTEMPORARY WHEAT VARIETIES OF PAKISTAN

S. I. H. Shah, M. A. Sahito, S. Tunio, A. J. Pirzado

Abstract


Testing  of  wheat  varieties  in  different  agro-ecological  zone  is  essential for evaluation  of stability  of  performance  and  range  of  adaptations. The main objective  of  this  study  was to determine  variety-environment interaction, stability a nd adaptability of various characters and effect of different environments relationship of characters with grain yield and grain protein percentage in spring wheat (Triticum aestivum L.) Ten varieties viz. Kiran-95, Mehran-89, Tandojam-83,  Abadgar-93, Anmol-91, Punjab-96, Chakwal 86, Shahkar-87, Parwaz-94 and Pirsabak-85 were evaluated at nine different locations for three years during the 1999-2000, 2000-2001, and 2001-2002 respectively. Data were recorded on various plant characters viz. plant height, peduncle length, flag leaf area, productive tillers per meter, spike length,  number of  spikelets per spike, rachis segment length, number of grains per spike, 1000-grain weight, grain protein percentage, number of maturity days and grain yield (t/h). Variety-location (σvl) variety-year (σvy) and variety-location-year (σvly) interactions were highly significant for all characters. The relative  magnitude  of  interaction  variance components  indicated that relative performance  of  varieties  for  plant  height, peduncle  length,  flag leaf  area, productive tillers parameter, rachis segment length, 1000-grain weight, grain protein percentage and grain yield were more inconsistent across locations than years. The opposite was true for spike length spikelets per spike, grain per spike and maturity days. The stability parameters (within variety mean square (Si²), variety coefficient of variation (CVi %), ecovalence (Wi²), variety interaction variance (σi²), regression coefficient (bi), deviation from regression mean square (δi²) and coefficient of determination (Ri²)), revealed a range of stability for all characters.


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