Evaluation of the effect of Abscisic acid and jasmonic acid on some morphophysiological traits of safflower genotypes Under deficit irrigation regimes
Subject Areas : Tension
1 - Agronomy Department, Payame Noor University, Tehran, Iran
Keywords: Crop growth rate, Leaf area durability, Leaf area index, Oil percentage, Oil yield.,
Abstract :
In order to investigate the effect of low irrigation treatment and foliar application of abscisic and jasmonic acids on morphophysiological traits of safflower genotypes (Carthamus tinctorius L.), an experiment was set out in a split factorial in a randomized complete block design with three replications at Shahrod University Agricultural Research Station during the two years, i.e. 2020-2021. The main factor consisted of three levels of irrigation of 100%, 75% and 50% of the plant's water requirement of safflower and sub-factor including safflower genotypes including Sinai, Goldasht, Faraman and foliar application with three levels including (0 concentration, foliar application of jasmonic acid with 0.5 mM concentration and foliar application of Abscisic acid with 20 mM concentration. The results showed that the highest relative content of leaf water(92.1 percent) chloorophyll a (1.6 mg per gram of leaf fresh weight), chlorophyll b (0.956 mg per gram of leaf fresh weight), leaf area index (3.46), grain yield (2325 kg/ha) oil percentage (27.88 percent) and oil yield (648 kg/ha) orelated to Sina genotype and 100% of the plant's water requirement and the least of these traits were related to the goldasht genotype and 50% of the plant's water requirement. Also, the results of this study showed that the interaction effects of genotype× deficit irrigtion and genotype× foliar application were significant only on chlorophyll a and oil yield. Foliar application with abscisic acid compared to jasmonic acid had a greater effect on chlorophyll a so that in the treatment with absicsic acid the ammont of chloropyll a was 1.67 in the treatment with jasmonic acid ,the level of chlorophyll a wsa 1.63. Also, foliar application of Jasmonic and abscisic acids increased all traits compared to the non foliar application treatment. The results of this study showed that the differences between the genotypes and also effect of foliar application of jasmonic and abscisic acids to increase of these traits were important components that could be used to select genotypes and suitable compounds to reduce undesirable effects of water stress in order to achieve increased economic performance.
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