عنوان مقاله [English]
Background and Objective: The goals of study were to consider the effects of water deficit at fall rosette and seed filling stages on seed and oil yields and their component of superior safflower winter genotypes and to recognize drought tolerant genotypes to cultivate in marginal lands of Tabriz plain.
Methods and Materials: An experiment was conducted as split plot based on a randomized complete blocks design with three replications in the East Azarbaijan Agriculture and Natural Resources Research and Education Center during 2019-20 cropping season. The experimental factors included drought stress (non-stressed and stressed during rosette and seed filling stages and five safflower genotypes including: Padideh, Golemehr, Parnian, Mexico248 and, Mexico14.
Results: The effects of water deficit during fall rosette stage on seed and oil yields and their components were insignificant. Whereas drought at seed filling stage significantly decreased amounts of mentioned traits. Correlation of capitulum diameter with harvest index, thousand seeds weight, seed and oil yields were significant. The correlations among seed yield component with each other, seed and oil yields were significant. The highest amounts of seed and oil yields belonged to Padideh, Golemehr and Mexico248.
Conclusion: Fall rosette stage in safflower was not critical for water deficit. Whereas drought during the seed filling stage significantly decreased capitulum diameter, seeds in a capitulum, thousand seeds weight, seed and oil yields. It seems that Padideh, Golemehr and, Mexico248 are suitable to cultivate in dry and marginal lands of Tabriz plain and Mexico248 can be used for safflower breeding programs.