Department of Plant Eco-physiology, Faculty of Agriculture, University of Tabriz, Tabriz, 5166614766, Iran.
Department of Plant Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran.
Biol Futur. 2020 Sep;71(3):313-321. doi: 10.1007/s42977-020-00039-z.
Water deficit is one of the most limiting factors for plant growth and production. Polyamines are osmo-active compounds and have important roles in plant resistance to water limitation. A pot experiment was undertaken in a greenhouse as factorial based on complete randomized block design with three replications to assess the physiological and biochemical responses of safflower to different levels of water supply (100% and 40% field capacity) and spermine (0, 40 and 60 µM). Ascorbate peroxidase and peroxidase activities (POX), malondialdehyde (MDA), hydrogen peroxide (HO), anthocyanins, soluble protein, soluble sugars and proline contents in shoots increased, while total phenols, flavonoids, and photosynthetic pigments significantly decreased due to water deficit. Foliar spray of spermine mitigated the adverse effects of water deficit by increasing the catalase, superoxide dismutase, POX activities, soluble proteins and photosynthetic pigments, and by decreasing MDA and HO contents. Spermine could, therefore, play an important role in protecting photosynthetic system and cellular membranes during drought stress in safflower.
水分亏缺是影响植物生长和产量的最主要限制因子之一。多胺是具有渗透调节作用的化合物，在植物抵御水分胁迫方面具有重要作用。本试验采用完全随机区组设计，在温室盆栽条件下，以红花为材料，研究了不同水分供应（100%和 40%田间持水量）和不同施精胺水平（0、40 和 60μM）对其叶片生理生化特性的影响。结果表明，水分亏缺导致红花叶片中超氧化物歧化酶、过氧化物酶、过氧化氢酶、抗坏血酸过氧化物酶活性以及丙二醛、脯氨酸和可溶性糖含量增加，总酚、类黄酮和光合色素含量降低。叶面喷施精胺可提高叶片中抗氧化酶活性、可溶性蛋白和光合色素含量，降低 MDA 和 H2O2 含量，从而缓解水分亏缺对红花的伤害。因此，精胺可能在红花干旱胁迫下保护其光合系统和细胞膜中发挥重要作用。
