Effects of abiotic factors on growth and chemical defenses in cultivated clones of <Emphasis Type="Italic">Laurencia dendroidea</Emphasis> J. Agardh (Ceramiales,Rhodophyta) |
| |
Authors: | Daniela Bueno Sudatti Mutue Toyota Fujii Silvana Vianna Rodrigues Alexander Turra Renato Crespo Pereira |
| |
Institution: | 1.Departamento de Biologia Marinha, Instituto de Biologia,Universidade Federal Fluminense (UFF),Niterói, Rio de Janeiro,Brazil;2.Departamento de Ficologia,Instituto de Botanica,S?o Paulo,Brazil;3.Departamento de Química Analítica,Universidade Federal Fluminense,Niterói, Rio de Janeiro,Brazil;4.Departamento de Oceanografia Biológica, Instituto Oceanográfico,Universidade de S?o, Paulo,S?o Paulo,Brazil |
| |
Abstract: | Laurencia dendroidea shows high inter- and intrapopulation variability in the amount of the sesquiterpene elatol, caused by genetic variation
as well as environmental factors. To test the independent effect of physical and nutritional conditions, the growth and the
levels of elatol in L. dendroidea clones were evaluated under different conditions of temperature, salinity, irradiance, and culture medium in the laboratory.
Growth of L. dendroidea was clearly affected by all these factors, but elatol levels were influenced only by temperature and salinity. Better conditions
for growth did not produce a similar effect on elatol production in L. dendroidea, contradicting the carbon/nutrient balance and growth/differentiation balance models. On the contrary, severe conditions
of temperature and salinity promoted a decrease in elatol levels, as predicted by the environmental stress model. Our results
using clones indicated that abiotic factors clearly take part in fostering chemical variations observed in natural populations,
in addition to genetic factors, and can promote differential susceptibility of plant specimens to natural enemies. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|