University of Tabriz Journal of Agricultural Science and Sustainable Production 2476-4310 33 1 2023 04 21 Changes in physiological traits, grain and oil yields of black mustard (Brassica nigra L.) in response to foliar application of putrescine under drought stress Changes in physiological traits, grain and oil yields of black mustard (Brassica nigra L.) in response to foliar application of putrescine under drought stress 97 111 16191 10.22034/saps.2022.49547.2794 FA Kazem Ghassemi-Golezani Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz,, Tabriz, Iran Leila Abbasi Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran Roghayeh Solhi-khajehmarjan Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran Journal Article 2021 12 22 Background and Objective: In order to investigate the effect of different levels of putrescine on physiological traits and oil production of Black mustard grains (Brassica nigra L.) under drought stress, an experiment was conducted in 2019 at the research farm of the Faculty of Agriculture, University of Tabriz.<br />Materials and Methods: The experiment was laid out as split plot on the basis of a randomized complete block design with three replications. Experimental treatments including irrigation intervals (I1, I2, I3 and I4: irrigation after 70, 100, 130, and 160 mm evaporation from class A pan, respectively) and putrescine foliar application (Pu0, Pu1, Pu2: foliar spray of water and 50 and 100 µM putrescine, respectively) were assigned to the main and sub-plots, respectively. <br />Results: Green cover percentage, leaf chlorophyll index, photosystem II efficiency, leaf water content, yield components, grain yield and oil yield were decreased, but leaf temperature and electrolyte leakage were significantly increased as a consequence of severe drought stress. Foliar application of putrescine, especially at a concentration of 50 µM improved all of these traits under different irrigation levels.<br />Conclusion: Black mustard tolerates mild water deficit, but Severe stress causes a considerable decline in grain and oil yields. Foliar application of putrescine at a concentration of 50 µM is recommended as a suitable treatment to improve drought tolerance grain and oil production of black mustard. Therefore, application of putrescine can considerably reduce drought injuries on plants. Background and Objective: In order to investigate the effect of different levels of putrescine on physiological traits and oil production of Black mustard grains (Brassica nigra L.) under drought stress, an experiment was conducted in 2019 at the research farm of the Faculty of Agriculture, University of Tabriz.<br />Materials and Methods: The experiment was laid out as split plot on the basis of a randomized complete block design with three replications. Experimental treatments including irrigation intervals (I1, I2, I3 and I4: irrigation after 70, 100, 130, and 160 mm evaporation from class A pan, respectively) and putrescine foliar application (Pu0, Pu1, Pu2: foliar spray of water and 50 and 100 µM putrescine, respectively) were assigned to the main and sub-plots, respectively. <br />Results: Green cover percentage, leaf chlorophyll index, photosystem II efficiency, leaf water content, yield components, grain yield and oil yield were decreased, but leaf temperature and electrolyte leakage were significantly increased as a consequence of severe drought stress. Foliar application of putrescine, especially at a concentration of 50 µM improved all of these traits under different irrigation levels.<br />Conclusion: Black mustard tolerates mild water deficit, but Severe stress causes a considerable decline in grain and oil yields. Foliar application of putrescine at a concentration of 50 µM is recommended as a suitable treatment to improve drought tolerance grain and oil production of black mustard. Therefore, application of putrescine can considerably reduce drought injuries on plants. https://sustainagriculture.tabrizu.ac.ir/article_16191_e33419c37bb68b2b84eb7fd0012ad160.pdf