University of Tehran International Journal of Horticultural Science and Technology 2322-1461 6 1 2019 06 01 Effect of Exogenous Application of L-arginine and Sodium Nitroprusside on Fruit Abscission and Physiological Disorders of Pistachio (Pistacia vera L.) Scions 51 62 71616 10.22059/ijhst.2019.270762.265 EN Maryam Eslami Department of Biology, Faculty of Science, Shahid Bahonar University, Kerman, Iran Fatemeh Nasibi Department of Biology, Faculty of Science, Shahid Bahonar University, Kerman, Iran Khosrow Manouchehri Kalantari Department of Biology, Faculty of Science, Shahid Bahonar University, Kerman, Iran Masoud Khezri Department of Horticultural Sciences, Faculty of Agriculture, Shahid Bahonar University of Kerman Hakimeh Oloumi Department of Ecology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran Journal Article 2018 12 03 Pistachio yield are often negatively affected by some physiological problems such as abscission of inflorescence buds and fruits, deformed or blank nuts, and non-split shells. In the present study the effect of exogenous application of arginine (Arg) (a substrate for nitric oxide (NO) synthase) and sodium nitroproside (SNP), as a NO-donor was investigated on yield production, fruit and inflorescence buds abscission, and physiological parameters of Pistacia vera. The experiment was conducted in randomized complete block design with factorial structure in a commercial pistachio orchard. Factors were included two levels of Arg (0.5 and 1 mM), two levels of SNP (50 and 100 μM) and their combination applied at two distinct time; one week before full bloom (first stage) and five weeks after full bloom (second stage). Comparing to SNP-treated trees, Arg was more effective on growth and physiological parameters of shoots and on fruit and inflorescence buds abscission, and on fruit parameters such as split and non-split shells, blank nuts, number of nuts per ounce. Effects of these treatments were considerably depending on the time of application and the concentrations of applied compounds. It is proposed that the effects of Arg and SNP may be related to the NO signaling and polyamines production. https://ijhst.ut.ac.ir/article_71616_9d5347d5573b3fa7dafb08067be70f3c.pdf