Department of Botany, Faculty of Chemical and Biological Sciences, The Islamia University of Bahawalpur, Bahawalpur, Pakistan.
Department of Horticulture, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan.
Sci Rep. 2024 Sep 17;14(1):21657. doi: 10.1038/s41598-024-72420-0.
Salinity stress adversely affects plant growth by disrupting water uptake, inducing ion toxicity, initiating osmotic stress, impairing growth, leaf scorching, and reducing crop yield. To mitigate this issue, the application of kaempferol (KP), caffeic acid (CA), and plant growth-promoting rhizobacteria (PGPR) emerges as a promising technology. Kaempferol, a flavonoid, protects plants from oxidative stress, while caffeic acid, a plant-derived compound, promotes growth by regulating physiological processes. PGPR enhances plant health and productivity through growth promotion, nutrient uptake, and stress mitigation, providing a sustainable solution. However, combining these compounds against drought requires further scientific justification. That's why the current study was conducted using 4 treatments, i.e., 0, 20 µM KP, 30 μM CA, and 20 µM KP + 30 μM CA without and with PGPR (Bacillus altitudinis). There were 4 replications following a completely randomized design. Results showed that 20 µM KP + 30 μM CA with PGPR caused significant enhancement in potato stem length (14.32%), shoot root, and leaf dry weight (16.52%, 11.04%, 67.23%), than the control. The enrichment in potato chlorophyll a, b, and total (31.86%, 46.05%, and 35.52%) was observed over the control, validating the potential of 20 µM KP + 30 μM CA + PGPR. Enhancement in shoot N, P, K, and Ca concentration validated the effective functioning of 20 µM KP + 30 μM CA with PGPR evaluated to control. In conclusion, 20 µM KP + 30 μM CA with PGPR is the recommended amendment to alleviate salinity stress in potatoes.
盐胁迫通过破坏水分吸收、诱导离子毒性、引发渗透胁迫、损害生长、叶片灼伤和降低作物产量，对植物生长产生不利影响。为了解决这个问题，应用山奈酚（KP）、咖啡酸（CA）和植物促生根际细菌（PGPR）成为一种有前途的技术。山奈酚是一种类黄酮，可保护植物免受氧化应激，而咖啡酸是一种植物衍生化合物，通过调节生理过程促进生长。PGPR 通过促进生长、吸收养分和减轻压力来增强植物的健康和生产力，提供了一种可持续的解决方案。然而，将这些化合物结合起来对抗干旱需要进一步的科学论证。这就是为什么当前的研究使用 4 种处理方法进行，即 0、20μM KP、30μM CA 和 20μM KP+30μM CA，没有和有 PGPR（Bacillus altitudinis）。采用完全随机设计，有 4 次重复。结果表明，与对照相比，20μM KP+30μM CA+PGPR 处理显著提高了马铃薯茎长（14.32%）、地上部和根干重（16.52%、11.04%、67.23%）。与对照相比，马铃薯叶绿素 a、b 和总含量（31.86%、46.05%和 35.52%）增加，验证了 20μM KP+30μM CA+PGPR 的潜力。增加地上部氮、磷、钾和钙浓度验证了 20μM KP+30μM CA+PGPR 的有效作用，可用于控制。综上所述，PGPR 处理 20μM KP+30μM CA 是缓解马铃薯盐胁迫的推荐改良措施。
