Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, B.O box 34, Al-Khoud, Muscat, 123, Oman.
J Plant Physiol. 2020 Jun;249:153163. doi: 10.1016/j.jplph.2020.153163. Epub 2020 Apr 18.
The effects of a newly discovered endophytic fungus, Talaromyces omanensis, on the drought tolerance of tomato is presented in this study. The fungus was obtained from a desert plant Rhazya stricta in Oman. Drought stress was induced by a 15% solution of Polyethylene glycol-6000 (PEG-6000). Several parameters were measured including pollen sterility, pollen tube length, growth, flowering, and yield characteristics, the biochemical analysis of the leaves and fruits, as well as other physiological and anatomical parameters. The results showed that T. omanensis provided multiple advantages to tomato grown under drought stress, including improved reproductive characteristics, chlorophyll fluorescence, and some anatomical characteristics such as increased phloem and cortex width and a reduction of pith autolysis that leads to hollow stem. In addition, T. omanensis significantly increased drought-stress related characteristics such as shoot dry weight, root length, the number of flowers, and fruit weight. A significantly higher concentration of gibberellic acid (GA) was found in tomato plants treated by T. omanensis, which may enhance their drought tolerance. These results suggest that T. omanensis is a potential biological anti-stress stimulator for important horticultural crops such as tomatoes. This study is the first to report the beneficial effects of T. omanensis in alleviating drought stress in tomatoes.
本研究介绍了一种新发现的内生真菌——阿曼拟青霉（Talaromyces omanensis）对番茄耐旱性的影响。该真菌从阿曼沙漠植物 Rhazya stricta 中获得。干旱胁迫通过 15%的聚乙二醇-6000（PEG-6000）溶液诱导。测量了包括花粉不育率、花粉管长度、生长、开花和产量特征、叶片和果实的生化分析以及其他生理和解剖参数在内的多个参数。结果表明，阿曼拟青霉为番茄在干旱胁迫下提供了多种优势，包括改善了繁殖特征、叶绿素荧光以及一些解剖特征，如增加韧皮部和皮层的宽度，减少空心茎的髓自溶。此外，阿曼拟青霉显著增加了与干旱胁迫相关的特征，如地上部干重、根长、花的数量和果实重量。在经阿曼拟青霉处理的番茄植株中发现了显著更高浓度的赤霉素（GA），这可能增强了它们的耐旱性。这些结果表明，阿曼拟青霉是一种潜在的生物抗应激刺激物，可用于重要的园艺作物，如番茄。本研究首次报道了阿曼拟青霉在缓解番茄干旱胁迫方面的有益效果。
