Ceratocystis fimbriata Employs a Unique Infection Strategy Targeting Peltate Glandular Trichomes of Sweetpotato (Ipomoea batatas) Plants

• DOI: 10.1094/phyto-05-20-0165-r
• Publication Date: 2020-07-20T11:20:16Z
• Authors: Yong Sun; Mengqiu Li; Yansu Wang; Lianwei Li; Meng Wang; Xintong Li; Mengke Xu; Gary J. Loake; Ming Guo; Jihong Jiang
• Keywords: Trichome; Epidermis (zoology)

The infection processes of Ceratocystis fimbriata BMPZ13 (BMPZ13) was elucidated on vegetative tissues sweetpotato plants employing light and scanning electron microscopy. Vegetative infected with C. by either wounding or nonwounding inoculation methods developed typical disease symptoms, establishing black rot in stems necrosis buds, young leaves, sprouts, addition to wilt leaves shoot cuttings, vascular associated diseases. runner hyphae formed from germinated conidia were able directly penetrate the epidermal cuticle for initial invade peltate glandular trichomes, specialized secretory structures store secrete metabolites. A two-step biotrophic phase observed stems, featuring both intercellular intracellular invasive hyphae, latter found within living cells leaf epidermis. Subsequent a necrotrophic displaying cell death veins. Additionally, this an iron-associated ferroptosis, supporting notion that iron is involved infection. Significantly, we establish employs unique strategy: targeting trichomes. Collectively, our findings show plant fungal pathogen hemibiotrophic style tissues.