Citrus Fruit-Cracking: Causes and Occurrence

Citrus fruit creasing or cracking is a complex pre-harvest physiological disorder that causes significant economic losses. Recent studies have indicated that citrus fruit creasing or cracking is caused not only by genetic factors but also by environmental factors. By reviewing the relationship between citrus fruit creasing or cracking and peel mechanical properties, the cellular wall ultrastructure, cellular wall metabolism and modification, this paper summarized the mechanism of citrus creasing or cracking and further explained the effects of genetic factors and environmental factors (light, temperature, humidity, mineral nutrition and plant growth regulators) on citrus fruit creasing or cracking rate. Further studies were proposed to provide a sound theoretical basis on citrus fruit creasing or cracking.