Resveratrol production potential of grape flowers and green berries to screen genotypes for gray mold and powdery mildew resistance |
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| Authors: | Mikio Shiraishi Hiroyuki Chijiwa Hiroyuki Fujishima Koji Muramoto |
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| Institution: | (1) Fukuoka Agricultural Research Center, 587 Yoshiki, Fukuoka 818-8549, Japan |
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| Abstract: | The ability of grape cultivars to produce resveratrol in response to UV radiation is associated with their resistance to fungal
pathogens. In this study, we evaluated the UV-induced resveratrol production potential of grape flowers and green berries
of 72 grape genotypes. Their ability to produce resveratrol in response to UV radiation was used to establish a selection
criterion for screening genotypes for resistance to gray mold and powdery mildew. We quantified resveratrol in grape flower
extracts from pre-bloom and early bloom flowers after exposure to UV radiation. There was a strong negative correlation between
UV-induced resveratrol production and susceptibility to Botrytis infection. The grape genotype was considered to be susceptible to gray mold when the resveratrol content of whole flower
clusters was less than 10 μg g−1 FW after the UV treatment. We determined resveratrol production in response to UV radiation in whole grape berries from 0
to 30 days after full bloom. The ability to produce resveratrol in response to UV increased by 8- to 20-times during this
period, depending on the genotype. At 30 days after full bloom, Vitis
vinifera genotypes generally had low levels of resveratrol (<50 μg g−1 FW), while interspecific hybrids, especially the North American cultivars, had high levels (>50 μg g−1 FW). There were clear varietal differences in resistance to Erysiphe (powdery mildew) infection. Susceptibility to Erysiphe infection was strongly negatively correlated with UV-induced resveratrol production. |
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