Issa Alaa, Esmaeel Qassim, Sanchez Lisa, Courteaux Barbara, Guise Jean-Francois, Gibon Yves, Ballias Patricia, Clément Christophe, Jacquard Cédric, Vaillant-Gaveau Nathalie, Aït Barka Essaïd
SFR Condorcet FR CNRS 3417, Unité de Recherche Résistance Induite et BioProtection des Plantes, UFR Sciences Exactes et Naturelles, Université de Reims Champagne-Ardenne, Reims, France.
UMR 1332 Biologie du Fruit et Pathologie, INRA, Villenave-d'Ornon, France.
Front Plant Sci. 2018 Oct 18;9:1397. doi: 10.3389/fpls.2018.01397. eCollection 2018.
Abnormal temperatures induce physiological and biochemical changes resulting in the loss of yield. The present study investigates the impact of the PsJN strain of on tomato ( Mill.) in response to heat stress (32°C). The results of this work showed that bacterial inoculation with strain PsJN increased tomato growth parameters such as chlorophyll content and gas exchange at both normal and high temperatures (25 and 32°C). At normal temperature (25°C), the rate of photosynthesis and the photosystem II activity increased with significant accumulations of sugars, total amino acids, proline, and malate in the bacterized tomato plants, demonstrating that the PsJN strain had a positive effect on plant growth. However, the amount of sucrose, total amino acids, proline, and malate were significantly affected in tomato leaves at 32°C compared to that at 25°C. Changes in photosynthesis and chlorophyll fluorescence showed that the bacterized tomato plants were well acclimated at 32°C. These results reinforce the current knowledge about the PsJN strain of and highlight in particular its ability to alleviate the harmful effects of high temperatures by stimulating the growth and tolerance of tomato plants.
异常温度会引发生理和生化变化，从而导致产量损失。本研究调查了发根农杆菌PsJN菌株对番茄（Lycopersicon esculentum Mill.）应对热胁迫（32°C）的影响。这项工作的结果表明，接种PsJN菌株可提高番茄在正常温度和高温（25°C和32°C）下的生长参数，如叶绿素含量和气体交换。在正常温度（25°C）下，接种该菌株的番茄植株光合作用速率和光系统II活性增加，同时糖、总氨基酸、脯氨酸和苹果酸大量积累，这表明PsJN菌株对植物生长有积极影响。然而，与25°C时相比，32°C时番茄叶片中蔗糖、总氨基酸、脯氨酸和苹果酸的含量受到显著影响。光合作用和叶绿素荧光的变化表明，接种该菌株的番茄植株在32°C时能很好地适应环境。这些结果强化了目前关于发根农杆菌PsJN菌株的认识，尤其突出了其通过刺激番茄植株生长和耐受性来减轻高温有害影响的能力。
