Differential susceptibility of blastospores and aerial conidia of entomopathogenic fungi to heat and UV-B stresses,Fungal Biology

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Differential susceptibility of blastospores and aerial conidia of entomopathogenic fungi to heat and UV-B stresses
Fungal Biology ( IF 2.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.funbio.2020.04.003
Cíntia das Chagas Bernardo ₁ , Ronaldo Alves Pereira-Junior ₁ , Christian Luz ₁ , Gabriel Moura Mascarin ₂ , Éverton Kort Kamp Fernandes ₁

Affiliation

We investigated the comparative susceptibility to heat and UV-B radiation of blastospores and aerial conidia of Metarhizium spp. (Metarhizium robertsii IP 146, Metarhizium anisopliae s.l. IP 363 and Metarhizium acridum ARSEF 324) and Beauveria bassiana s.l. (IP 361 and CG 307). Conidia and blastospores were produced in solid or liquid Adámek-modified medium, respectively, and then exposed to heat (45 ± 0.2 °C) in a range of 0 (control) to 360 min; the susceptibility of fungal propagules to heat exposures was assessed to express relative viability. Similarly, both propagules of each isolate were also exposed to a range of 0 (control) to 8.1 kJ m-2 under artificial UV-B radiation. Our results showed that fungal isolates, propagule types and exposure time or dose of the stressor source play critical roles in fungal survival challenged with UV-B and heat. Conidia of ARSEF 324, IP 363, IP 146 and IP 361 exposed to heat survived significantly longer than their blastospores, except for blastospores of CG 307. Conidia and blastospores of IP 146 and IP 363 were equally tolerant to UV-B radiation. We claim that blastospores of certain isolates may be promising candidates to control arthropod pests in regions where heat and UV-B are limiting environmental factors.

中文翻译：

昆虫病原真菌芽孢子和气生分生孢子对热和 UV-B 胁迫的不同敏感性

我们研究了绿僵菌属的芽生孢子和气生分生孢子对热和 UV-B 辐射的相对敏感性。（绿僵菌 IP 146、绿僵菌 sl IP 363 和绿僵菌 ARSEF 324）和白僵菌 sl（IP 361 和 CG 307）。分生孢子和芽孢分别在固体或液体 Adámek 改良培养基中产生，然后在 0（对照）到 360 分钟的范围内加热（45±0.2°C）；真菌繁殖体对热暴露的敏感性被评估以表达相对活力。同样，在人工 UV-B 辐射下，每个分离株的两个繁殖体也暴露于 0（对照）至 8.1 kJ m-2 的范围内。我们的结果表明，真菌分离株，繁殖体类型和压力源的暴露时间或剂量在受到 UV-B 和热量挑战的真菌生存中起着关键作用。ARSEF 324、IP 363、IP 146 和 IP 361 的分生孢子暴露于高温下的存活时间明显长于它们的芽孢，除了 CG 307 的芽孢。 IP 146 和 IP 363 的分生孢子和芽孢同样耐受 UV-B 辐射。我们声称，某些分离株的芽生孢子可能是在高温和 UV-B 限制环境因素的地区控制节肢动物害虫的有希望的候选者。

更新日期：2020-08-01

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