beta-Cyclodextrin-Based Nitrosoglutathione Improves the Storage Quality of Peach by Regulating the Metabolism of Endogenous Nitric Oxide, Hydrogen Sulfide, and Phenylpropane

Nitrosoglutathione (GSNO) andP-cyclodextrin (P-CD) exhibit positive roles in regulating fruit quality. However, there are few reports about the effects of GSNO andP-CD on enhancing storability and boosting nitric oxide (NO), hydrogen sulfide (H2S), and phenylpropane metabolism in fruits during storage. "Xintaihong" peach were treated with 0.5, 1.0, 1.5 mmol L-1 GSNO in 0.5% (w/v)P-CD solution (GSNO/P-CD). The effects of GSNO/P-CD on endogenous NO, H2S, and phenylpropane metabolism were investigated. Treatment with GSNO/P-CD increased the color difference of peach and inhibited the increase of respiratory intensity, weight loss, and relative conductivity. Treatment with 1.0 mmol L-1 GSNO/P-CD increased the nitric oxide synthase (NOS-like) activity and L-arginine content, thereby promoting the accumulation of endogenous NO. By improving the activities of L-cysteine desulf-hydrylase (L-CD), O-acetylserine sulfur lyase (OAS-TL), serine acetyltransferase (SAT), GSNO/P-CD increased the content of endogenous H2S in peach. Treatment with GSNO/P-CD increased the activities of phenylalanine ammonia-lyase (PAL), 4-coumarate-CoA ligase (4CL), and cinnamic acid-4-hydroxylase (C4H), promoted the increase of total phenols, flavonoids, and lignin in peach. These results indicated that GSNO/P-CD treatment better maintained the quality of peach by improving the metabolism of endogenous NO, H2S, and phenylpropane during storage.