Abstract
Little is known about factors affecting anthocyanin biosynthesis in red-fleshed apples (Malus × domestica Borkh.). The objective was to establish the effects of orchard management factors on flesh anthocyanin content of dark-colored (DC) and light-colored (LC) apple clones. Flesh color was assessed by measuring color in the L, a, b mode using a spectrophotometer and predicting the anthocyanin content based on relationships between the absorption of a flesh extract at 530 nm and the L-value determined using a spectrophotometer (r2 = 0.99 ***). Fruit from the DC clone were red by 86 days after full bloom (DAFB), whereas the LC clone began to color at 136 DAFB. Color intensity in both clones decreased from the top of the tree to the base. Further, the intensity of the flesh color of the DC clone decreased with shading (94% absorption of incident photosynthetic active radiation). Covering a fruit with a UV absorbing film (100% UV absorption) had no effect on flesh color in the DC clone but decreased color in the LC clone. Fruit thinning increased color in DC and LC fruit. There was little change in flesh color during storage. However, the DC clone developed severe flesh browning as storage progressed beyond 30 days. The results demonstrated that light (visible and UV wavelength) stimulated, whereas shade inhibited, anthocyanin biosynthesis in the flesh under orchard conditions.
Highlights
IntroductionSome apple genotypes have become available that have red-flesh
The red blush of apple fruit skin is an important quality attribute
We focused on factors related to light exposure because light affects anthocyanin biosynthesis in the skin and may, play a role in the flesh
Summary
Some apple genotypes have become available that have red-flesh. In these genotypes, the red color in the skin extends into the flesh of the fruit. Red fleshed genotypes fall into two categories, types 1 and 2. Type 1 genotypes are strongly pigmented and dark-colored. The flesh color forms early during fruit development and the leaves and shoots are colored. In type 1 genotypes, the transcription factor MdMYB10 is involved in regulating the biosynthesis of anthocyanins. Type 2 genotypes are less color intensive. Coloration begins late in development, and leaves and shoots are without red color. In type 2 genotypes the transcription factor MdMYB110a is involved in the regulation of biosynthesis of anthocyanin [4,5,6]
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