Genetic regulation of fruit development and ripening.

Fruit development and ripening are unique to plants and represent an important component of human and animal diets. Recent discoveries have shed light on the molecular basis of developmental ripening control, suggested common regulators of climacteric and nonclimacteric ripening physiology, and defined a new role for MADS box genes in this late stage of floral development. Analyses of fruit-ripening mutants and ripening-related gene expression suggest higher levels of a developmental regulatory cascade that remain to be defined. Examination of the molecular basis of ethylene signaling in tomato has demonstrated conservation of the basic model defined in Arabidopsis, yet with modifications in gene family composition and expression that may represent adaptations to promote successful fruit development and seed dispersal. The role of light signaling in fruit carotenoid accumulation is being examined and may represent a target for practical manipulation of fruit pigmentation and nutrient content. The continuing development of genomics tools, including ESTs and cDNA microarrays, for important fruit crops should foster accelerated discovery in fruit development and ripening research.