Abstract
Our results based on transcriptome data and physiological alterations give an account for enhancing high-pH tolerance in blueberry seedlings with AMF inoculation. To understand the responses occurring in leaves of arbuscular mycorrhizal fungi (AMF)-inoculated plants under high-pH stress, we combined physiological analyses with leaf transcriptome profiles of AMF-inoculated and non-inoculated blueberry (Vaccinium corymbosum) cultivar “O’Neal” under optimal-pH (pH 4.2) and high-pH (pH 6.2) conditions. Comparative transcriptome analysis revealed 250 differentially expressed genes (DEGs) in AMF-inoculated plants when compared with non-inoculated plants under high-pH stress. These DEGs were involved in 37 metabolic pathways, such as photosynthesis, hormone metabolism, carbohydrate metabolism, amino acid metabolism, stress response, signal transduction, and antioxidation. Physiological analyses revealed that AMF-inoculated plants presented lower respiration and higher photosynthesis efficiency under high-pH stress, along with accumulation of photosystem II reaction center PsbP family protein, enhancement of amino acids content, and stronger secondary metabolites biosynthesis ability, when compared with non-inoculated plants. These results provide new insights into a probable mechanism of protection of photosynthesis and enhancement of high-pH tolerance in blueberry seedlings with AMF inoculation.
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