Distinct interactions of ericoid mycorrhizae and plant growth-promoting bacteria: impacts on blueberry growth and heat resilience.

Plant signaling & behavior Pub Date : 2024-12-31 Epub Date: 2024-03-17 DOI:10.1080/15592324.2024.2329842
Kaleb Fransgo, Lei-Chen Lin, Hyungmin Rho
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Abstract

Blueberries confront substantial challenges from climate change, such as rising temperatures and extreme heat, necessitating urgent solutions to ensure productivity. We hypothesized that ericoid mycorrhizal fungi (ErM) and plant growth-promoting bacteria (PGPB) would establish symbiotic relationships and increase heat stress tolerance in blueberries. A growth chamber study was designed with low (25/20°C) and high temperature (35/30°C) conditions with micropropagated blueberry plantlets inoculated with ErM, PGPB, and both. Gas exchange and chlorophyll fluorescence properties of the leaves were monitored throughout the growth. At harvest, biochemical assays and biomass analysis were performed to evaluate potential oxidative stress induced by elevated temperatures. ErM application boosted root biomass under 25/20°C conditions but did not impact photosynthetic efficiency. In contrast, PGPB demonstrated a dual role: enhancing photosynthetic capacity and reducing stomatal conductance notably under 35/30°C conditions. Moreover, PGPB showcased conflicting effects, reducing oxidative damage under 25/20°C conditions while intensifying it during 47°C heat shock. A significant highlight lies in the opposing effects of ErM and PGPB on root growth and stomatal conductance, signifying their reciprocal influence on blueberry plant behavior, which may lead to increased water uptake or reduced water use. Understanding these complex interactions holds promise for refining sustainable strategies to overcome climate challenges.

麦角菌根和植物生长促进菌的不同相互作用:对蓝莓生长和抗热能力的影响。
蓝莓面临着气候变化带来的巨大挑战,如气温升高和极端高温,因此需要迫切的解决方案来确保其生产力。我们假设,麦角菌根真菌(ErM)和植物生长促进细菌(PGPB)将建立共生关系,并提高蓝莓对热应力的耐受力。我们设计了一项生长室研究,在低温(25/20°C)和高温(35/30°C)条件下,将微繁殖蓝莓植株接种 ErM、PGPB 或两者。在整个生长过程中监测叶片的气体交换和叶绿素荧光特性。收获时,进行生化测定和生物量分析,以评估高温诱导的潜在氧化胁迫。在 25/20°C 的条件下,施用 ErM 提高了根的生物量,但对光合效率没有影响。相比之下,PGPB 表现出了双重作用:在 35/30°C 条件下显著提高光合能力并降低气孔导度。此外,PGPB 还表现出相互矛盾的作用,在 25/20°C 条件下,PGPB 可减少氧化损伤,而在 47°C 热冲击条件下,PGPB 则会加剧氧化损伤。一个重要的亮点在于 ErM 和 PGPB 对根系生长和气孔导度的相反作用,这表明它们对蓝莓植物行为的相互影响,可能会导致吸水增加或用水减少。了解这些复杂的相互作用为完善克服气候挑战的可持续战略带来了希望。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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