Mihaljević I, Viljevac Vuletić M, Tomaš V, Zdunić Z, Vuković D
Agricultural Institute Osijek, Južno predgrađe 17, HR-31000 Osijek, Croatia.
Photosynthetica. 2024 Feb 5;62(1):79-89. doi: 10.32615/ps.2024.006. eCollection 2024.
High temperatures have significant impacts on fruit tree production. Foliar spraying application of promoting agents can be a sustainable approach to managing high-temperature stress in orchards. The mechanism of certain improving agents on photosynthesis is not yet well understood, particularly in fruit trees. Photosynthesis, as a vital and very sensitive process in plants, is a pivotal component in fruit production. Therefore, in this study, we explored the potential of two different promoting agents, salicylic acid (SA) and ascorbic acid (AsA), to alleviate oxidative stress caused by high temperature in controlled conditions (37°C for 1 h) at the photosynthetic level. For studying photosynthetic responses, we used chlorophyll fluorescence measurements. According to our findings, foliar application of promoting agents effectively increased the high-temperature tolerance of apple leaves, when compared to sole heat stress treatment. Both promoting agents significantly increased photosynthetic efficiency under stress, while the maximum was observed with AsA. In general, AsA and SA applications had a positive effect on the photosynthesis of apple leaves at high temperatures.
高温对果树生产有重大影响。叶面喷施促进剂可能是一种可持续的果园高温胁迫管理方法。某些改善剂对光合作用的机制尚未完全了解，尤其是在果树中。光合作用是植物中一个至关重要且非常敏感的过程，是果实生产的关键组成部分。因此，在本研究中，我们探讨了两种不同促进剂水杨酸（SA）和抗坏血酸（AsA）在可控条件下（37°C处理1小时）光合水平上缓解高温引起的氧化应激的潜力。为了研究光合响应，我们使用了叶绿素荧光测量。根据我们的研究结果，与单独的热应激处理相比，叶面喷施促进剂有效地提高了苹果叶片的高温耐受性。两种促进剂在胁迫下均显著提高了光合效率，其中AsA的效果最为显著。总体而言，AsA和SA处理对高温下苹果叶片的光合作用有积极影响。
