GENOTYPE X ENVIRONMENT INTERACTION FOR GRAIN QUALITY CHARACTERS IN RICE (Oryza sativa L.)

Abstract

Fourteen rice (Oryza sativa L.) varieties and lines were grown at three locations over 2 years. The effect of genotype X environment (G x E) interactions on some grain quality characters was evaluated. The characters investigated were the following ones: grain length, grain width, grain shape (L/W ratio), hulling %, milling %, head rice %,elonga-. tion, gelatinization temperature (G.T.) and amylose content. It was found that the first order interaction variety x location was significant for hulling %,milling %, head rice % and G.T. only. On the other hand, the variety X year interaction was insignificant for all the studied traits except G.T. The second order interaction variety x location X year, however, was highly significant for all the studied traits. The best grain shape was recorded for the new promising line Gz 2175-5-6, while the variety Giza 171 had the highest milling outturn among the short grain varieties and Giza 181 among the long grain ones.The lowest amylose content values were determined for Giza 172 (18.04 %) and Giza 171 (18.9%), however, the rice variety IR 28 showed the highest amylose content (27.21%).