Loading…

Characterization of Brazilian Cordyceps fumosorosea isolates: Conidial production, tolerance to ultraviolet-B radiation, and elevated temperature

[Display omitted] •Positive correlation between UV-B and heat tolerance.•High variation in conidia production among isolates.•Exposure to radiation for more than 4 h is harmful to most of the isolates.•Exposure to 45 °C for more than 30 min reduced conidial germination. Cordyceps fumosorosea is an e...

Full description

Saved in:
Bibliographic Details
Published in:Journal of invertebrate pathology 2023-03, Vol.197, p.107888-107888, Article 107888
Main Authors: Rojas, Víctor Manuel Arévalo, Iwanicki, Natasha Sant́Anna, D'Alessandro, Celeste Paola, Fatoretto, Maíra Blumer, Demétrio, Clarice Garcia Borges, Delalibera, Italo
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Positive correlation between UV-B and heat tolerance.•High variation in conidia production among isolates.•Exposure to radiation for more than 4 h is harmful to most of the isolates.•Exposure to 45 °C for more than 30 min reduced conidial germination. Cordyceps fumosorosea is an entomopathogenic fungus with a global distribution and is used for the biological control of agricultural pests. High conidial productivity and tolerance to abiotic stresses such as elevated temperature and ultraviolet radiation (UV-B) are desired characteristics in candidate isolates for commercial products. Our goal in this study was to characterize promising isolates of C. fumosorosea from five Brazilian biomes regarding conidial production, tolerance to UV-B, and elevated temperature (45°). Seventy-two isolates out of 172 were chosen visually, based on growth and sporulation in culture medium, and grown on parboiled rice. Next, fourteen isolates were selected, based on productivity on rice and origin of isolation, for production in polypropylene bags and submitted to UV-B for 2, 4, 6, and 8 h or to 45 °C for 30, 60, and 90 min. High variations in conidial production were observed among isolates, and a positive correlation was observed between UV-B and heat tolerance. The isolates ESALQ4556 and ESALQ4778 showed the highest yields of conidial production in polypropylene bags (3.51 × 109 conidia/g dry rice), while ESALQ1296, an isolate recovered from insects, was the most tolerant to UV-B and 45 °C. Exposure to radiation for more than 4 h and placed directly at 45 °C for more than 30 min significantly reduced conidial germination for all C. fumosorosea isolates. These results contribute to a better understanding of the tolerance to abiotic factors of Brazilian isolates of C. fumosorosea.
ISSN:0022-2011
1096-0805
DOI:10.1016/j.jip.2023.107888