Fungal tissue per se is stronger as a UV-B screen than secondary fungal extrolites in Lobaria pulmonaria

被引：19

作者：

Gauslaa, Yngvar ^{[1
]}

Alam, Md. Azharul ^{[1
]}

Lucas, Pierre-Louis ^{[1
]}

Chowdhury, Dipa Paul ^{[1
]}

Solhaug, Knut Asbjorn ^{[1
,2
]}

机构：

[1] Norwegian Univ Life Sci, Fac Environm Sci & Nat Resource Management, POB 5003, NO-1432 As, Norway

[2] Norwegian Univ Life Sci, Fac Environm Sci & Nat Resource Management, CERAD, POB 5003, NO-1432 As, Norway

来源：

FUNGAL ECOLOGY | 2017年 / 26卷

关键词：

Carbon-based secondary compounds; Lobaria pulmonaria; Green algae; Stictic acid; Sun screens; UV-A; UV-B; UV tolerance; UV transmittance; LICHEN XANTHORIA-PARIETINA; SOLAR-RADIATION; USNIC-ACID; PROTECTION; FOREST; SNAILS; DAMAGE; LIGHT; PALATABILITY; SCROBICULATA;

D O I：

10.1016/j.funeco.2017.01.005

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

To test the hypotheses that (1) protective mycobiont tissues and/or (2) medullary UV-B-absorbing carbon -based secondary compounds (CBSCs) protect lichen photobionts against UV-B radiation, we quantified cortical UV-transmittance and ran a three-way factorial lab experiment with (1) three UV radiation regimes, (2) photobiont layers with/without a screening cortex, and (3) with natural/reduced CBSC-concentration. We used melanin-deficient Lobaria pulmonaria from shaded forests. Maximum photochemical efficiency of photosystem II (Fv/Fm) in photobionts inside thalli with natural CBSCconcentrations was not affected by any UV-regime, consistent with close to 0% measured cortical transmittance of wavelengths <325 nm. Exposing photobiont layers tb direct radiation strongly aggravated photoinhibition (P < 0.001), as did an increase in UV-exposure (P < 0.001). The effect of CBSCremoval was weaker (yet significant at P = 0.001), mainly affecting exposed photobiont layers given short-wavelength UV radiation. Based on these findings, we conclude that the primary role of extrolites in L pulmonaria is not to screen excess solar radiation. (C) 2017 Elsevier Ltd and British Mycological Society. All rights reserved.

引用

页码：109 / 113

页数：5

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