Heavy metals alter photosynthetic pigment profiles as well as activities of chlorophyllase and 5-aminolevulinic acid dehydratase (ALAD) in Amaranthus lividus seedlings.
J Environ Biol
;
2003 Oct; 24(4): 395-9
Artigo
em Inglês
| IMSEAR
| ID: sea-113728
ABSTRACT
Varied concentrations of PbCl2 and CdCl2 in the germinating media reduced the total chlorophyll and carotenoid contents in primary leaves of Amaranthus lividus seedlings (168 h old). When chlorophyll a and chlorophyll b contents were measured separately, greater loss of chl b than chl a under the identical conditions of heavy metal treatment was observed In addition, the loss of total chlorophyll was more than carotenoids under the same magnitude of heavy metal treatment. The effect of heavy metal treatment at germination stage was further studied on chlorophyll accumulation in primary leaves in relation to the activities of 5-aminolevulinic acid dehydratase (ALAD) and chlorophyllase. The activities of ALAD gradually diminished in response to both the heavy metals in a concentration-guided manner, while the activities of chlorophyllase did not exhibit any significant change.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Espectrofotometria Ultravioleta
/
Fatores de Tempo
/
Hidrolases de Éster Carboxílico
/
Carotenoides
/
Clorofila
/
Folhas de Planta
/
Metais Pesados
/
Amaranthus
/
Relação Dose-Resposta a Droga
/
Sintase do Porfobilinogênio
Idioma:
Inglês
Revista:
J Environ Biol
Ano de publicação:
2003
Tipo de documento:
Artigo
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