| 词条 | Lessonia nigrescens |
| 释义 |
| image = Lessonia nigrescens at El Quisco beach.jpg | image_caption = Lessonia nigrescens at El Quisco beach, Chile | unranked_regnum = SAR | superphylum = Heterokonta | classis = Phaeophyceae | ordo = Laminariales | familia = Lessoniaceae | genus = Lessonia | species = L. nigrescens | binomial = Lessonia nigrescens | binomial_authority = Bory de Saint-Vincent, 1826 | subdivision_ranks = Subspecies | subdivision = }} Lessonia nigrescens, the grey weed or giant grey weed, is a South American kelp species in the genus Lessonia. There is at least two populations of the seaweed, marked by the difference in phenolic content. There is a subtidal population with higher phenol content and an intertidal population with a lighter phenol content. The difference in the phenolic content can be explained by the herbivory selection pressure due to the sea snail Tegula tridentata.[1] UV treatment induces the production of phlorotannins that accumulate in physodes.[2] This weed contains the phytosterol saringosterol that shows an inhibitory effect on Mycobacterium tuberculosis growth.[3] References1. ^Micropopulation differentiation in phenol content and susceptibility to herbivory in the Chilean kelp Lessonia nigrescenss (Phaeophyta, Laminariales). Enrique A. Martínez, Hydrobiologia, July 1996, Volume 326-327, Issue 1, pages 205-211, {{doi|10.1007/BF00047808}} 2. ^Induction of Phlorotannins During UV Exposure Mitigates Inhibition of Photosynthesis and DNA Damage in the Kelp Lessonia nigrescens. Ivan Gómez and Pirjo Huovinen, Photochemistry and Photobiology, September/October 2010, Volume 86, Issue 5, pages 1056–1063, {{doi|10.1111/j.1751-1097.2010.00786.x}} 3. ^Inhibition of Mycobacterium tuberculosis growth by saringosterol from Lessonia nigrescens. Wächter Gerald A, Franzblau Scott G, Montenegro Gloria, Hoffmann Joseph J, Maiese William M and Timmermann Barbara N, Journal of Natural Products, 2001, volume 64, number 11, pages 1463-1464, {{INIST|14134197}} External links
2 : Lessoniaceae|Species described in 1826 |
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