VARIATION IN TREND OF GRAIN YIELD, GROWTH INDICES, STEM SOLUBLE CARBOHYDRATES AND CANOPY TEMPERATURE IN WINTER AND FACULTATIVE BREAD WHEAT VARIETIES RELEASED DURING 1930-2010 IN IRAN Abstract uri icon

abstract

  • To estimate the trend changes of grain yield, growth indices, stem soluble carbohydrates and canopy temperature, in fifteen winter and facultative bread wheat varieties that released between 1930-2010, a field experiment was conducted using randomized complete block design with three replications in cereal research department field at 201112 cropping season. The results showed that the trend of temporal variation for grain yield was additive and increased with the rate of 28.3 Kg ha-1 year-1. The highest and lowest average of grain yield was devoted to new variety released, Navid, and old variety, Sardari, 4.84 ton ha-1 and 2.58 ton ha-1, respectively. The analysis of variance showed that the growth indices including Crop growth Rate (CGR), Relative Growth Rate (RGR) were differences among studied genotype at 1% confidence level. The modern winter and facultative bread wheat varieties in comparison with older ones, reached earlier to maximum leaf area index (LAI). Also the leaf area duration (LAD) was higher in modern cultivars than older ones. In the most studied varieties, stem soluble carbohydrates of the peduncle and penultimate at 14 days after anthesis, stored and then exported the assimilate materials. The amount of reserved carbohydrates in penultimate was more than peduncle. Canopy temperature was lower in modern in comparison to older varieties at anthesis stage.

publication date

  • July 2019