Inhibition of hydrogen sulfide and hypotaurine on Monilinia fructicola disease in peach fruit

Hydrogen sulfide (H₂S) as a gasotransmitter and signal molecule plays prominent roles in plant response to biotic and abiotic stresses.
Hypotaurine (HT), another sulfur compound, can be used in food and proposed to reduce sulfide toxicity in deep-sea invertebrates’ cells.
The effects of H₂S and HT on resistance induction of peach [Prunus persica (L.) Batsch] fruit against brown rot caused by Monilinia fructicola were investigated.
It was found that fumigation with 50 mmol L^-1 NaHS solution (H₂S donor) for 2 h could effectively inhibit spore germination, mycelial development diameter and pathogenicity of M. fructicola, but only had an obvious effect on reducing disease incidence and lesion diameter of peach fruit during early storage.
On the contrary, 0.1 mmol L^-1 HT treatment had a better effect on reducing disease incidence and lesion diameter, but it had no significant inhibition on the pathogen.
The two sulfur-containing substances enhanced defense-related enzymes activities, such as chitinase (CHI), beta-1,3-glucanase (GNS) and phenylalanine ammonialyase (PAL). RT-PCR analysis showed that H₂S and HT stimulated the expression of three genes (CHI, GNS and PAL). By comprehensive analysis of the findings, HT is the primary choice to protect peach fruit from pathogen infection during storage period.

VIII International Postharvest Symposium: Enhancing Supply Chain and Consumer Benefits – Ethical and Technological Issues

Wenxue Wu, Chang Zhang, Lei Chen, Guangjin Li, Qingguo Wang, Jingying Shi

hydrogen sulfide, hypotaurine, peach fruit, Monilinia fructicola, defense-related enzymes

https://doi.org/10.17660/ActaHortic.2018.1194.38