Physiological responses of some rootstocks and cultivars of plum and prune (Prunus spp.) to drought stress
Subject Areas : Tension
بهناز سلیمانی
1
,
حمید طهماسبپور
2
,
محیالدین پیرخضری
3
,
بهزاد کاویانی
4
*
1 -
2 -
3 -
4 -
Keywords:
Abstract :
Plum and prune is one of the most important garden products in Iran. Drought stress is the most important environmental factor limiting the growth, yield and quality of horticultural crops worldwide. This research was conducted with the aim of investigating and comparing some physiological and biochemical responses of four cultivars and eight rootstocks of plum and prune in terms of drought tolerance to different levels of water limitation. This experiment was conducted as factorial in the form of randomized complete block design with three replications in Kamalshahr Horticultural Research Institute, Karaj, Iran, in 2022-2023 on 4-year-old growing trees. The factors include the eight rootstocks of Myrobalan 29C, Penta, Tetra, Saint Julien), Mariana 2624, GF 677, GN 15 and seedling as the first factor; four varieties of Simka, NO 16, Zochelo and Greengage, as the second factor; and the conditions of drought stress (without irrigation for 14 days) and control (without interruption in irrigation) were as the third factor. The results showed that the physiological characteristics related to photosynthesis were affected by genetic characteristics (rootstocks and cultivars) and drought stress. Zochelo and Greengage varieties and GN 15 rootstock had the highest and Simka variety and Mariana 2624 and Myrobalan 29C rootstocks had the lowest intracellular carbon dioxide and active photosynthesis. Drought stress caused a decrease in physiological parameters related to photosynthesis, including intracellular carbon dioxide, photosystem efficiency, greenness index, water consumption efficiency and mesophilic conductance. Among the rootstocks; GN 15, GF 677 and Mariana 2624 had better physiological stability under stress and the most tolerant variety among the varieties is NO 16, which is associated with plum and prune in most of the parameters. In total, the current research introduces the grafted compound NO 16/GN 15 as the most tolerant to drought stress.