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Xiaoying Zhang,Min Lu,Richard A. Ludlow,Wentao Ma,Huaming An 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.5
The fruit of the perennial rosebush Rosa roxburghii were valued for their high levels of ascorbic acid, superoxide dismutaseactivity, and cancer preventing eff ects. The high cellulose and low pectin content of Rosa roxburghii fruit results in an undesirablefi brous texture and hence needs to be addressed. However, little is known about the molecular mechanisms underlyingdietary fi ber metabolism in this fruit. Here, we report that the contents of cellulose, pectin, and lignin were increased byshading treatments at the maturation stage of fruit development. Under 50% shading, the soluble pectin content increased by16.39%, which may improve the fruit palatability. However, deeper shading of 100% caused the lignin content to increase by28.86%, which conversely may lower fruit quality. Based on transcriptome analysis, we identifi ed candidate genes involvedin dietary fi ber metabolism, including cellulose synthase (CesA) 1, 2, 3, and 5 , â-1,4-xylosyltransferase (IRX) , arabinosyltransferase(ARAD) 1 and 2 , galacturonosyltransferase (GAUT) , cellulolytic enzyme (Cx) , and pectin methylesterase , inwhich CesA1, CesA2, CesA3, IRX, ARAD2 , and GAUT3 signifi cantly responded to shading and positively correlated withthe content of their corresponding component. Furthermore, cinnamyl alcohol dehydrogenase was signifi cantly regulatedby shading treatment and positively correlated with increasing lignin concentration. These results may facilitate a betterunderstanding of the molecular mechanisms of dietary fi ber metabolism in R. roxburghii fruit under low light conditionsand provide a framework for future crop improvement.