کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5517650 1543639 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fungal tissue per se is stronger as a UV-B screen than secondary fungal extrolites in Lobaria pulmonaria
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Fungal tissue per se is stronger as a UV-B screen than secondary fungal extrolites in Lobaria pulmonaria
چکیده انگلیسی

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 CBSC-concentrations was not affected by any UV-regime, consistent with close to 0% measured cortical transmittance of wavelengths <325 nm. Exposing photobiont layers to direct radiation strongly aggravated photoinhibition (P < 0.001), as did an increase in UV-exposure (P < 0.001). The effect of CBSC-removal 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fungal Ecology - Volume 26, April 2017, Pages 109-113
نویسندگان
, , , , ,