Source-sink foliar boron (10B) mobility modulated by carbohydrate synthesis and confers antioxidative defense in sugar beet (Beta vulgaris L.) under water deficit conditions

IF 6.8 Q1 PLANT SCIENCES
Md. Shah Newaz Chowdhury , Britta Pitann , Md. Sazzad Hossain , Karl H. Mühling
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Abstract

Drought is a global abiotic stressor which affects boron (B) availability due to reduced mobility. This is particularly affecting B-demanding crops such as sugar beet. However, linking B translocation dynamics and drought-mitigating factors is largely unknown. Therefore, we hypothesize that foliar B application facilitates B long-distance transport, triggering, e.g., osmoregulation and the antioxidant defense system. Plants were grown under sufficient (2.5 mg kg−1) and deficient (0.25 mg kg−1) conditions of 11B-boric acid for 28 days after sowing, then 24 days of ample and limited water, with or without foliar 10B-boric acid of 300 mg L−1. In this study, it was observed that foliar-applied 10B translocates from source to sink tissue and increases mobility at sufficient 11B supply under water-deficit conditions. Conversely, B-induced accumulation of sucrose and osmolality (ψs) indicates lower foliar 10B transport failure from source to sink tissue. Further, higher levels of H2O2 and MDA under B deficiency and limited water supply cause a reduction of dry matter. However, foliar-applied 10B at sufficient 11B resulted in the upregulation of the antioxidant defense systems, as reflected by enzyme activities, e.g., CAT, and AsA-GSH cycle enzymes. In contrast, it leads to a decrease in SOD activity, indicating the cellular redox balance. Our findings highlight and provide unprecedented insights into understanding the dynamics of B translocation from source to sink using B tracers (10B and 11B), where B status delineates the distribution and mobility of foliar B. This suggests protection against ROS and coordination of carbohydrate metabolism while mitigating antioxidative stress.
水分亏缺条件下,碳水化合物合成对甜菜源库硼(10B)迁移的调节及其抗氧化防御作用
干旱是一种全球性的非生物胁迫源,由于流动性降低而影响硼(B)的有效性。这尤其影响到甜菜等需要维生素b的作物。然而,B转运动态与干旱缓解因素之间的联系在很大程度上是未知的。因此,我们假设叶面B的施用促进了B的远距离运输,触发了渗透调节和抗氧化防御系统。播种后,植株在11b -硼酸充足(2.5 mg kg - 1)和不足(0.25 mg kg - 1)的条件下生长28天,然后进行24天的丰水和限水,叶面有或没有300 mg L - 1的10b -硼酸。本研究发现,在水分不足的条件下,叶面施用的10B从源组织向汇组织转运,增加了11B供应充足时的移动性。相反,b诱导的蔗糖积累和渗透压(ψs)表明叶片从源组织到汇组织的10B运输失败较低。此外,在B缺乏和供水有限的情况下,较高的H2O2和MDA水平导致干物质减少。然而,在足够的11B条件下,叶面施用10B会导致抗氧化防御系统的上调,这反映在酶活性上,例如CAT和AsA-GSH循环酶。相反,它导致SOD活性降低,表明细胞氧化还原平衡。我们的研究结果强调并提供了前所未有的见解,通过B示踪剂(10B和11B)来理解B从源到汇的转运动力学,其中B状态描述了叶片B的分布和流动性,这表明在减轻抗氧化应激的同时保护了活性氧和碳水化合物代谢的协调。
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来源期刊
Plant Stress
Plant Stress PLANT SCIENCES-
CiteScore
5.20
自引率
8.00%
发文量
76
审稿时长
63 days
期刊介绍: The journal Plant Stress deals with plant (or other photoautotrophs, such as algae, cyanobacteria and lichens) responses to abiotic and biotic stress factors that can result in limited growth and productivity. Such responses can be analyzed and described at a physiological, biochemical and molecular level. Experimental approaches/technologies aiming to improve growth and productivity with a potential for downstream validation under stress conditions will also be considered. Both fundamental and applied research manuscripts are welcome, provided that clear mechanistic hypotheses are made and descriptive approaches are avoided. In addition, high-quality review articles will also be considered, provided they follow a critical approach and stimulate thought for future research avenues. Plant Stress welcomes high-quality manuscripts related (but not limited) to interactions between plants and: Lack of water (drought) and excess (flooding), Salinity stress, Elevated temperature and/or low temperature (chilling and freezing), Hypoxia and/or anoxia, Mineral nutrient excess and/or deficiency, Heavy metals and/or metalloids, Plant priming (chemical, biological, physiological, nanomaterial, biostimulant) approaches for improved stress protection, Viral, phytoplasma, bacterial and fungal plant-pathogen interactions. The journal welcomes basic and applied research articles, as well as review articles and short communications. All submitted manuscripts will be subject to a thorough peer-reviewing process.
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