Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt.
Cytogenetics and Molecular Genetics Unit, Botany and Microbiology Department, Faculty of Science, Helwan University, Helwan, 11795, Egypt.
BMC Plant Biol. 2024 Jul 11;24(1):662. doi: 10.1186/s12870-024-05340-w.
Enhancing crops' drought resilience is necessary to maintain productivity levels. Plants interact synergistically with microorganisms like Beauveria bassiana to improve drought tolerance. Therefore, the current study investigates the effects of biopriming with B. bassiana on drought tolerance in Malva parviflora plants grown under regular irrigation (90% water holding capacity (WHC)), mild (60% WHC), and severe drought stress (30% WHC).
The results showed that drought stress reduced the growth and physiological attributes of M. parviflora. However, those bioprimed with B. bassiana showed higher drought tolerance and enhanced growth, physiological, and biochemical parameters: drought stress enriched malondialdehyde and HO contents. Conversely, exposure to B. bassiana reduced stress markers and significantly increased proline and ascorbic acid content under severe drought stress; it enhanced gibberellic acid and reduced ethylene. Bioprimed M. parviflora, under drought conditions, improved antioxidant enzymatic activity and the plant's nutritional status. Besides, ten Inter-Simple Sequence Repeat primers detected a 25% genetic variation between treatments. Genomic DNA template stability (GTS) decreased slightly and was more noticeable in response to drought stress; however, for drought-stressed plants, biopriming with B. bassiana retained the GTS.
Under drought conditions, biopriming with B. bassiana enhanced Malva's growth and nutritional value. This could attenuate photosynthetic alterations, up-regulate secondary metabolites, activate the antioxidant system, and maintain genome integrity.
提高作物的耐旱性对于维持生产力水平是必要的。植物与白僵菌等微生物协同作用，提高耐旱性。因此，本研究调查了在常规灌溉（90%水分保持能力（WHC））、轻度（60%WHC）和重度干旱胁迫（30%WHC）下，用白僵菌生物引发对生长的影响马尔瓦矮小植物对干旱的耐受性。
结果表明，干旱胁迫降低了矮小紫茉莉的生长和生理特性。然而，用白僵菌生物引发的矮小紫茉莉表现出更高的耐旱性和增强的生长、生理和生化参数：干旱胁迫使丙二醛和羟基含量丰富。相反，暴露于白僵菌在重度干旱胁迫下降低了应激标志物，显著增加脯氨酸和抗坏血酸含量；它增强了赤霉素，降低了乙烯。在干旱条件下，生物引发的矮小紫茉莉提高了抗氧化酶活性和植物的营养状况。此外，10 个简单序列重复引物检测到处理之间存在 25%的遗传变异。基因组 DNA 模板稳定性（GTS）略有下降，对干旱胁迫更为明显；然而，对于受干旱胁迫的植物，用白僵菌生物引发可以保持 GTS。
在干旱条件下，用白僵菌生物引发可以增强矮小紫茉莉的生长和营养价值。这可以减轻光合作用的改变，上调次生代谢物，激活抗氧化系统，维持基因组完整性。
