Department of Horticulture, College of Agriculture, Isfahan University of Technology, Isfahan, Iran.
Mol Biol Rep. 2019 Feb;46(1):497-503. doi: 10.1007/s11033-018-4502-3. Epub 2018 Nov 27.
Pepper is mostly produced in greenhouses and fields in spring up to the end of summer. The reproductive stage coincides with high temperature of summer, which causes flowers to drop, leading to reduction in the yield, Se as a beneficial element can improved some stress indices. Control randomized design experiment was conducted to investigate the effect(s) of Se on heat stresses of pepper in control environment. Se in three concentrations of SeCl (4 (Se1), 6 (Se2) and 8 (Se3) mg L) was used at 35 ± 2 °C for 4 h a day, matching the high afternoon temperature. Growth, photosynthesis traits (Photosynthesis rate, transpiration and stomatal conductance), flower dropping and antioxidant changes were all measured. Results showed that Se1 decreased deleterious effects of heat stresses on vegetative traits (fresh and dry weight of fruit). Including dry weight of shoot, fresh and dry weight of root, and reproductive growth, such as Fresh weight and dry weight of fruit, flowers and fruit number. Photosynthesis rate, fruit antioxidant and phenol improved with the application of Se to heat stresses. POD and SOD activity increased, and MDA content decreased with Se application at the high temperature. Se also improved the P and S uptake. Generally, using 4 and 6 mg L of Se could improve growth and physiological and phytochemical parameters of pepper and decrease the flower dropping at high temperature.
辣椒主要在春季温室和露地种植，一直持续到夏末。生殖阶段恰逢夏季高温，导致花朵凋落，产量下降。硒作为一种有益元素，可以改善一些胁迫指标。在控制环境下，采用控制随机设计实验研究了硒对辣椒热胁迫的影响。在 35±2°C下，每天处理 4 小时，模拟午后高温，用三种浓度的亚硒酸钠（SeCl，4（Se1）、6（Se2）和 8（Se3）mg·L-1）处理。生长、光合作用特性（光合速率、蒸腾和气孔导度）、落花和抗氧化变化均进行了测量。结果表明，Se1 降低了热胁迫对营养生长特性（果实的鲜重和干重）的有害影响。包括地上部和根系的鲜重和干重，生殖生长，如果实、花和果实数的鲜重和干重。光合作用速率、果实抗氧化和酚类物质随着硒的应用而提高。在高温下，POD 和 SOD 活性增加，MDA 含量减少。硒还提高了 P 和 S 的吸收。一般来说，使用 4 和 6 mg·L-1 的硒可以改善辣椒的生长和生理生化参数，减少高温下的落花。
