Improvement of Hanseniaspora uvarum biocontrol activity against gray mold by the addition of ammonium molybdate and the possible mechanisms involved |
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| Authors: | HM Liu JH GuoL Luo P LiuBQ Wang YJ ChengBX Deng CA Long |
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| Institution: | National Centre of Citrus Breeding, Key Laboratory of Horticultural Plant Biology of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei 430070, PR China |
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| Abstract: | The efficacy of Hanseniaspora uvarum against gray mold by adding ammonium molybdate (NH4–Mo) and the mode of actions were evaluated. The results showed that H. uvarum at 1 × 106 CFU ml−1 plus 1 mmol l−1 NH4–Mo greatly reduced gray mold in grape fruits. NH4–Mo at concentrations of 1, 5, 10 and 15 mmol l−1 significantly inhibited spore germination and mycelium growth of Botrytis cinerea. Population growth of H. uvarum was markedly inhibited by NH4–Mo at 5 mmol l−1in vitro and not affected by addition of NH4–Mo at 1 and 5 mmol l−1 in wounds combination of NH4–Mo and H. uvarum induced higher activities of peroxidase (POD), polyphenoloxidase (PPO), phenylalanine ammonialyase (PAL), superoxide dismutase (SOD), catalase (CAT) and β-1,3-Glucanase than individual application of H. uvarum or NH4–Mo. The enhancement of disease control may be directly because of the inhibitory effects of NH4–Mo on spore germination and mycelial growth of B. cinerea in vitro, and indirectly because of the induced defense reactions by NH4–Mo in grape berries. |
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| Keywords: | Biocontrol Antagonistic yeast Ammonium molybdate Postharvest disease Grape berries |
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