Abstract
Abnormal temperatures induce physiological and biochemical changes resulting in the loss of yield. The present study investigates the impact of the PsJN strain of Paraburkholderia phytofirmans on tomato (Lycopersicon esculentum Mill.) in response to heat stress (32°C). The results of this work showed that bacterial inoculation with P. phytofirmans 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 P. phytofirmans and highlight in particular its ability to alleviate the harmful effects of high temperatures by stimulating the growth and tolerance of tomato plants.
Highlights
The biggest challenge facing the world at present is climate change as it will affect the geographical distribution of vegetation types, ecosystem processes, primary production, and abundance of plant species (Malcolm et al, 2006; Lesk et al, 2016)
The present study suggests that the Paraburkholderia phytofirmans strain PsJN (PsJN) strain of P. phytofirmans induces adaptive mechanisms to avoid negative impacts at high temperatures in tomato plants
The rhizoplane of tomato roots was colonized by P. phytofirmans strain PsJN cells immediately after the inoculation of the soil, reaching 6.85 ± 04 log10 CFU/g FW of the root tissue
Summary
The biggest challenge facing the world at present is climate change as it will affect the geographical distribution of vegetation types, ecosystem processes, primary production, and abundance of plant species (Malcolm et al, 2006; Lesk et al, 2016). High temperature is a main environmental factor that often limits the growth and productivity of important crop species and lead to a great. Rising temperature can cause a change in growth periods and crops, leading to a high risk of survival of specific species (Mendelsohn et al, 2016). Extreme temperature is one of the most severe and damaging environmental factors that affect the integrity of plant cells. The increase in temperature adversely affects the quantity and quality of all plant species, including tomatoes (Rodriguez-Ortega et al, 2016). The exposure of plants to long- or short-term high temperatures has a negative impact on the fruits by altering specific physiological processes in male reproductive development (Sato et al, 2000, 2006) and reducing crop production (Mohammed and Tarpley, 2011)
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