FHB بررسي همبستگي چند صفت مرفولوژيكي و فيزيولوژيكي گندم با شدت آلودگي به بيماري بلايت فوزاريومي سنبله

Study of Correlation Between Some Morphological and Physiological Characters of Wheat and Fusarium Head Blight Infection

Fusarium head blight (FHB) of wheat is an important yield reducing factor in warm and humid wheat growing areas of the world. In Iran, due to introduction and widely cultivation of a susceptible cultivar Fatal in Caspin sea shore area (Zone I), the FHB caused major epidemics and resulted in crop losses. In some parts of the central and southern regions of Iran, fusarium has also been reported on a limitted scale. During 1997 - 98 growing season, 121 and 217 lines cultivars of wheat were evaluated for reaction to FHB at Sari and Gorgan Research Stations, respectively. Studies were conducted to determine correlation between spike density, plant height, 1000 KW., days to heading, and disease severity. Correlation coefficients and multiple range regression coefficient at Sari Station indicated that there was a significant negative correlation between grain infection and 1000 KW and spike density. Also, there were significant and negative regression between infection severity and days to heading, spike density, and 1000 KW. Results at the Gorgan Station also indicated that there were negative and significant correlation and regression coefficient between infection severity and 10(R) KW, spike density, and plant height. These results can he useful for identification of resistance sources to FHB.