Effects of light on the growth and photosynthesis of Egeria najas planchon
Braz. arch. biol. technol
;
46(2): 203-209, Mar. 2003. tab, graf
Article
in English
| LILACS
| ID: lil-351395
RESUMO
Photosynthesis and growth of Egeria najas (Hydrocharitaceae) from a subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay) were measured in response to low light intensities (0-124 æM m-2 s-1 PAR) in the laboratory. Photosynthesis approached saturation in the range of light intensities used and light compensation point was reached at ca. 6-22 æM m-2 s-1 PAR, indicating that this species had a low light requirement for growth. Light stimulated shoot and root relative growth rates (RGR) but it was not related to ratios between rootshoot RGR. Laboratory observations indicated that (i) both shoot and root growth were simultaneously stimulated by light and (ii) the low light requirements of E. najas may explain its incidence in the Itaipu Reservoir, where biogenic as well as abiogenic turbidity is high
Full text:
Available
Index:
LILACS (Americas)
Language:
English
Journal:
Braz. arch. biol. technol
Journal subject:
Biology
Year:
2003
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual de Maringá/BR
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