Plant Biostimulant Group, Shannon Applied Biotechnology Centre, Institute of Technology Tralee, Clash, Tralee, Co. Kerry, Ireland.
Plant Biostimulant Group, Shannon Applied Biotechnology Centre, Institute of Technology Tralee, Clash, Tralee, Co. Kerry, Ireland.
Plant Physiol Biochem. 2018 May;126:63-73. doi: 10.1016/j.plaphy.2018.02.024. Epub 2018 Mar 2.
Global changes in climate are leading to increased occurrence and duration of drought episodes with concurrent reduction in crop yields. Expansion of the irrigated land area does not appear to be a viable solution in many regions to deliver crop productivity. The development of crop drought tolerance traits by either genetic modification or plant breeding represent the principal approaches to meeting this challenge to date. Biostimulants are an emerging category of crop management products which can enhance crop productivity under abiotic stress conditions. The ability of some biostimulant products such as Ascophyllum nodosum extracts (ANE) to enhance the tolerance of crops to drought stress has been observed by growers. The objective of this study was to investigate if different commercial ANE biostimulants provided the same tolerance to tomato plants (cv. Moneymaker) subjected to a defined drought period. A compositional characterisation of the key macromolecules of ANEs was performed. In addition, the role of ANE biostimulants in inducing changes of chlorophyll and osmolytes levels, MDA production, dehydrin isoform pattern and dehydrin gene expression levels was assessed. The three ANE biostimulants evaluated were found to provide different levels of tolerance to drought stressed tomato plants. The level of drought tolerance provided was related to changes in the concentration of osmolytes and expression of tas14 dehydrin gene. Taken together, our results highlight that despite the fact all ANE biostimulants were manufactured from the same raw material, their ability to maintain crop productivity during and after drought stress was not the same.
全球气候变化导致干旱事件的发生频率和持续时间增加，同时作物产量下降。在许多地区，扩大灌溉土地面积似乎不是提高作物生产力的可行办法。到目前为止，通过基因改良或植物育种开发作物耐旱性特征是应对这一挑战的主要方法。生物刺激素是一类新兴的作物管理产品，可在非生物胁迫条件下提高作物生产力。一些生物刺激素产品（如泡叶藻提取物 (ANE)）能够增强作物对干旱胁迫的耐受性，这一点已经被种植者观察到。本研究的目的是研究不同商业 ANE 生物刺激素是否为经历特定干旱期的番茄植株 (cv. Moneymaker) 提供相同的耐受性。对 ANE 的关键大分子进行了组成特征分析。此外，还评估了 ANE 生物刺激素在诱导叶绿素和渗透物水平、MDA 产生、脱水素同工型模式和脱水素基因表达水平变化方面的作用。评估的三种 ANE 生物刺激素被发现为耐旱番茄植株提供了不同水平的耐受性。耐旱性水平与渗透物浓度的变化和 tas14 脱水素基因的表达有关。总之，我们的结果表明，尽管所有的 ANE 生物刺激素都是由相同的原料制成的，但它们在干旱胁迫期间和之后维持作物生产力的能力并不相同。
