College of Breeding and Multiplication, Hainan University (Sanya Institute of Breeding and Multiplication), Sanya, 572022, China.
School of Life Sciences, Hainan University, Haikou, 570228, China.
Environ Sci Pollut Res Int. 2024 May;31(21):31287-31303. doi: 10.1007/s11356-024-33071-w. Epub 2024 Apr 17.
Aluminum (Al) toxicity poses a significant challenge to agricultural productivity, particularly in acidic soils. The banana crop, predominantly cultivated in tropical and subtropical climates, often grapples with low pH and Al toxicity. This study seeks to explore the differential responses of two banana genotypes with varying Al tolerance (Baodao and Baxi) to Al exposure (100 and 500 µM) for 24 h. Microscopic analysis uncovered distinctive structural modifications in root cells, with Baodao displaying more severe alterations in response to Al stress. There was higher superoxide (O) and hydrogen peroxide (HO) production and lipid peroxidation in Baodao indicating enhanced oxidative stress and membrane damage. Al accumulation in root tips was higher in Baxi than Baodao, while the roots of Baodao had a higher accumulation of callose. Nutrient content analysis revealed alterations in ion levels, highlighting the impact of Al exposure on nutrient uptake and homeostasis. In summary, Al differentially affects callose deposition, which, in turn, leads to Al uptake and nutrient homeostasis alteration in two contrasting banana genotypes. This intricate interplay is a key factor in understanding plant responses to aluminum toxicity and can inform strategies for crop improvement and soil management in aluminum-stressed environments.
铝（Al）毒性对农业生产力构成重大挑战，特别是在酸性土壤中。香蕉作物主要在热带和亚热带气候下种植，经常面临低 pH 值和 Al 毒性的问题。本研究旨在探索两种具有不同 Al 耐受性的香蕉基因型（宝岛和巴西）对 24 小时 Al 暴露（100 和 500µM）的差异反应。显微镜分析揭示了根细胞结构的明显变化，Baodao 对 Al 胁迫的反应更为严重。Baodao 中产生了更高的超氧化物（O）和过氧化氢（HO），脂质过氧化作用增强，表明氧化应激和膜损伤加剧。Baxi 根尖的 Al 积累量高于 Baodao，而 Baodao 的根中则积累了更多的几丁质。营养成分分析显示离子水平发生了变化，突出了 Al 暴露对养分吸收和体内平衡的影响。总的来说，Al 对几丁质沉积的影响存在差异，而这反过来又导致了两种对比鲜明的香蕉基因型对 Al 摄取和养分体内平衡的改变。这种复杂的相互作用是理解植物对铝毒性反应的关键因素，并为在铝胁迫环境中进行作物改良和土壤管理提供了策略。
