MALUS, THE BAD APPLE

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MALUS, THE BAD APPLE?

• Preston K. Andrews
• Department of Horticulture and Landscape
  Architecture
• Washington State University
• USA

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MEHLER-PEROXIDASE CYCLE
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TOMATO FRUIT MUTANTS

• Lycopersicon esculentum
• Dark green dg Chl persisting until maturity
• High pigment hp high Chl, carotenoids, AsA
• Unpigmented epidermis y colorless skin
• Delta Del increased ?-carotene, inhibited
  lycopene
• Ghost /gh incomplete Chl deficiency
• Ripening inhibitor rin green fruit at maturity
• L. pimpinellifolium
• Sunscald resistant sca
• Superoxide dismutase Sod isozyme 2

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BIOCHEMICAL METHODS

• Ascorbate - Ascorbate oxidase (Foyer et al.,
  1983)
• Glutathione - Glutathione reductase/
• 2-vinylpyridine (Griffith, 1980)
• Chlorophyll total carotenoids (Lancaster et
  al., 1994 Holden, 1976 Gross, 1991)
• Anthocyanins (Francis, 1982)