Study of morphological traits and their relations with yield in 6 promising lines of rice (Oryza sativa L.)

In order to study of morphological traits of promising rice lines, a field experiment was conducted at Dashtenaz research station of agricultural and natural resource center of Mazandaran province, Iran, based on randomized complete block design with 6 promising lines with three replications during 005. Some morphological traits such as plant height, tiller numbers and stem diameter were measured for 0 day intervals and other traits were measured at flowering stage. Results showed significant differences of studied rice lines at all morphological traits, except tiller numbers. Stem diameter had a positive significant correlation with grain yield. Plant height and stem diameter had also a positive and significant correlation with flag leaf. Number of flag leaf veins had a positive and significant correlation with stipule length, and plant height had a negative significant correlation with flag leaf chlorophyll content. Line no. 4 (IR67406-6---) produced maximum grain yield (998 Kg/ha) with the highest value of flag leaf chlorophyll content and stem diameter, and lowest value of plant height and peduncle length, and could be recommended as a promising line for future research programs and further agronomic practices under similar climatic conditions.