Dryopteris crassirhizomaDryocrassinABBAfor Postharvest Control of the Potato Dry Rot PathogenFusarium solanivar. coeruleum

Abstract

Dryopteris crassirhizoma dryocrassin ABBA treatment was tested for its effectiveness in controlling Fusarium solani var. coeruleum growth in vitro and for prevention of postharvest dry rot of potato tubers and slices. Dryocrassin ABBA strongly inhibited mycelial growth, resulting in reductions in both mycelium dry weight and per cent spore germination of F. solani var. coeruleum at concentrations of 2.0, 0.5 and 0.1 mg/ml. Scanning electron microscopy (SEM) observations showed that treatment induced abnormal, tightly twisted morphological changes in hyphae. Moreover, in vivo experiments demonstrated that dryocrassin ABBA treatment at 2 mg/ml effectively controlled dry rot of potato tubers inoculated with mycelial discs of F. solani var. coeruleum. After dryocrassin ABBA treatment, the content of soluble proteins, peroxidase (POD) and superoxide dismutase (SOD) activity increased, and malondialdehyde (MDA) content remained the stable situation. In addition, the expression level of plant lipid‐transfer proteins (LTPs) genes – StLTPa1, StLTPa7, StLTPb1 and StLTPb3 – was upregulated. These results collectively demonstrate that dryocrassin ABBA can inhibit growth of Fusarium pathogens to induce disease resistance. On the other side, dryocrassin ABBA maybe induce potato defence responses.

Preservation activity of Artemisia essential oils and a monomer in treating pepper bacterium and fungus diseases

“…Phomopsis sp, Botryosphaeria dothidea, Alternaria alternata and Pestalotiopsis micropora were the main pathogens of kiwifruit in Shanxi, Sichuan and Hunan (Li et al, 2017), Colletotrichum asianum, C. fucticola and C. siamense were the pathogens of mango leaf anthracnose in Guangxi (Mo et al, 2018). Bacillus, Pedtobacterium, Alternaria alternata and Fusarium isolated in this experiment were postharvest pathogens of pepper, Alternaria alternata was the pathogen of pomegranate, grape, citrus and other fruits and vegetables (Katoh et al, 2006;Tziros et al, 2008), and Fusarium was a soil-borne disease It often appeared in Medicago truncatula (Ramírez-Suero et al, 2010), potato, tomato (Wang et al, 2017) and onion (Someya et al, 2000). Bacillus was isolated in ginger (Peng et al, 2013), pepper and tomato.…”