Relationship among quantitative and qualitative traits in rice genotypes using stepwise regression model in Khuzestan region

Subject Areas : Agroecology Journal

kaveh Limouchi ¹ , Ataollah Siyadat ² , Mehrdad Yarnia ³ , Abdolali Gilani ⁴ , Varahram Rashidi ⁵

1 - Ph.D Agronomy. Young Researchers and Elite Club, Dezful Branch, Islamic Azad University, Dezful, Iran.
2 - Professor., University of Agricultural and Natural Resources of Ramin, Ahwaz, Iran.
3 - گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
4 - Seed and Plant Improvement Research Department, Khuzestan Agricultural and Natural Resources Research Center, AREEO, Ahvaz, Iran
5 - Department of Agronomy, Faculty of Agriculture, Tabriz Branch, Islamic Azad University, Tabriz, Iran

Received: 2018-01-13 Accepted : 2018-09-02 Published : 2018-08-23

Keywords:  non-linear relationship,  regression,  rice breeding,  traits dependence,

Abstract :

To evaluate the relationship between quantitative and qualitative traits and also reproductive traits and grain yield in12 rice genotypes, an experiment was conducted based on random complete block design in Khuzestan province, Iran. The results of stepwise regression showed that the length, the filled, unfilled grain and  panicle primary branches also cooking quality, broken rice rate, grain length, bran percentage, grain length after cooking, elongation rate and gel consistency had the most significant changes in the grain yield. The panicle length had the highest positive and significant impact on grain yield due to positive relationship between panicle length and growth space. Also, amount of broken rice had the most negative impact on grain yield due to the reduction of grain qualitative characteristics which can be the main and important goal of breeding studies. Finally, it is recommended that to gain maximum seed yield, research is needed to reduce competition and increase volume and number of seeds to improve panicle length.