Codominant inheritance of polymorphic color variants of Gracilaria domingensis (Gracilariales, Rhodophyta)
Agar is the most valuable phycocoloid in the world market. Currently, about half of its production is obtained from the red alga Gracilaria (Gracilariales, Rhodophyta). Consequently, this genus has been the subject of many studies worldwide. A common green color variant of G. domingensis (Kützing) Sonder ex Dickie was found in a natural population on the northeastern coast of Brazil. Crosses were performed to determine the mode of color inheritance. The results can be interpreted as the expression of a pair of codominant alleles, where the green and red phenotypes are homozygous, and the heterozygotes present a brownish color. Heterozygous tetrasporophytes, at least until they are 4-5 cm long, exhibit a parental influence on the female gametophyte, since the reddish-brown or greenish-brown color is dependent on the female parent color (red or green). Mixed reproductive phases, as well as specimens with patches of different colors bearing spermatangia or cystocarps, were observed in laboratory cultures. Gametophytes that resulted from in situ germination of meiospores were also observed, and could be easily detected when red or green gametophytes were grown on brown tetrasporophytes.
Main Authors: | Plastino,Estela M., Guimarães,Melina, Matioli,Sergio R., Oliveira,Eurico C. |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Sociedade Brasileira de Genética
1999
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000100020 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Seasonal changes in the pigment composition of natural population of Gracilaria domingensis (Gracilariales, Rhodophyta)
by: Pereira,Dinaelza Castelo, et al.
Published: (2012) -
Histórico de vida de espécimens selvagens e variantes cromáticas de Gracilaria birdiae (Gracilariales, Rhodophyta)
by: VIVIANE L.,COSTA, et al.
Published: (2001) -
Efeitos do ágar no crescimento de explantes e na formação de calos em morfos pigmentares de Gracilaria domingensis (Kützing) Sonder ex Dickie (Gracilariales, Rhodophyta)
by: Ramlov,Fernanda, et al.
Published: (2009) -
Deleterious effect of TRIS buffer on growth rates and pigment content of Gracilaria birdiae Plastino & E.C. Oliveira (Gracilariales, Rhodophyta)
by: Ursi,Suzana, et al.
Published: (2008) -
Phenology of an agarophyte Gracilaria birdiae Plastino and E.C. Oliveira (Gracilariales, Rhodophyta) in Northeastern Brazil
by: Carneiro,Marcella A. A., et al.
Published: (2011)