اثر يخبندان خاك بر بذور خيس شده و ارتباط آن با برخي خصوصيات زراعي ژيوتيپ هاي گندم

Effect of Soil Freezing on Imbibed Seeds and itʹs Relationships With Some Agronomic Traits of Wheat Genotypes

To study the effects of soil freezing on seeds of bread wheat genotypes and its relation to growth habit and some agronomic characteristics, several experiments were carried out on 12 bread wheat genotypes using RCBD with 4 replications in Maragheh Dryland Agricultural Research Station under both laboratory and field conditions. Under field conditions several agronomic characters including: % winter survival, growth vigor, plant height, maximum tillers number, fertile tillers number, days to spike emergence, days to maturity, grain filling period and grain yield were measured. Under laboratory conditions, survival percentage of imbibed seeds after 60 days chilling (-3.5°C) and coleoptile length of seedlings after 15 days were recorded. The differences among genotypes for the % winter survival, growth vigor, coleoptile Length, plant height, maximum tillers number, days to spike emergence, days to maturity, grain filling period and grain yield were significant (P 0.05) but, genotypes did not have significant differences in soil freezing tolerance.The correlation between imbibed seed frost tolerance under laboratory condition with growth vigor and grain yield were positively significant but, it was negatively and significantly correlated with days to spike emergence. However, correlation of cold tolerance under field conditions with growth vigor and grain yield were positive. Correlation between growth habit with cold tolerance and grain yield were negatively significant (P 0.01) under field conditions.