Ecotypes of Hypnea pseudomusciformis (Cystocloniaceae, Rhodophyta) revealed by physiological, morphological, and molecular data

Author(s)

Nauer, Fabio ^[1] ; Naves, Matheus ^[2] ; Plastino, Estela Maria ^[2] ; Oliveira, Mariana Cabral ^[2] ; Fujii, Mutue Toyota ^[1]

Affiliation

^[1] Inst Bot, Nucleus Res Phycol, Av Miguel Estefano 3687, BR-04301902 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Biosci, Dept Bot, Rua Matao 277, BR-05508090 Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF APPLIED PHYCOLOGY; v. 32, n. 6, p. 4399-4409, DEC 2020.
• Web of Science Citations: 0

Abstract

The red seaweed Hypnea pseudomusciformis has economic potential for mariculture as a source of carrageenan and other products. This work investigates this species along the Brazilian coastline by evaluating the effects of irradiance (40, 70, and 100 mu mol photons m(-)(2) s(-1)) on the number of differentiated branches (Br), growth rates (GR), photosynthesis parameters, and pigment content of tetrasporophytes from five distinct geographical populations extending from 5 degrees to 27 degrees S of latitude. The specimens showed intraspecific divergence for COI-5P marker, divided into three haplotypes with distinct geographical distribution. Although irradiance effects were significant only for GR and Br, intraspecific diversity was significant in all variables analyzed, with the haplotype of the tropical zone (5 degrees to 12 degrees S) displaying higher GR, Br, and maximum quantum yield (F-v/F-m) than the haplotype of the subtropical zone (23 degrees to 27 degrees S), which displayed higher pigment concentration. The geographic intermediate haplotype (19 degrees S) displayed similar GR, Br, and F-v/F-m to the tropical haplotype, but similar pigment content to the subtropical haplotype. Our results indicate the presence of ecotypes within H. pseudomusciformis throughout its geographic distribution. Considering the set of physiological attributes, specimens from the tropical zone have higher potential for mariculture. (AU)

• FAPESP's process: 18/11445-7 - Elucidating the effects of global climate change on macroalgae: effects of marine heat waves on populations of Hypnea pseudomusciformis (Gigartinales, Rhodophyta)
• Grantee: Fábio Nauer da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/08734-0 - Effect of temperature and nutrients on color variants of Hypnea pseudomusciformis (Rhodophyta) and verification of genetic pattern for color inheritance
• Grantee: Matheus Naves de Almeida
• Support Opportunities: Scholarships in Brazil - Scientific Initiation