Pectin Esterase in Relation to Leaf Abscission in Coleus and Phaseolus1
AUTOR(ES)
Lamotte, Clifford E.
RESUMO
Pectin esterase (PE) activities in abscission zones, other portions of leaves, and adjacent stem tissues were compared in attached leaves and abscissing petioles (previously debladed) of Coleus blumei Benth. and Phaseolus vulgaris L., cv. Canadian Wonder. Earlier findings of Osborne in bean were confirmed and changes in PE activity in coleus were shown to resemble those in bean in some respects. In both plants PE was lower in the distal portion of abscission zones of abscissing petioles than in that portion of attached leaves but this difference was not as large or as consistently clear-cut in coleus as in bean. The general level of PE activity was an order of magnitude lower and changes associated with abscission were smaller in coleus than in bean. Auxin treatment of debladed petioles of coleus prevented abscission and resulted in small increases in PE activity in abscission zones and most of the other regions sampled. The largest increase was observed in the stem tissue adjacent to the attached leaf opposite the debladed, auxin treated one.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=396033Documentos Relacionados
- Further Comparative Studies of Pectin Esterase in Relation to Leaf and Flower Abscission 1
- Activity of Pectin Esterase and Cellulase in the Abscission Zone of Citrus Leaf Explants
- AUXIN IN RELATION TO LEAF BLADE ABSCISSION
- Mercury-induced Ethylene Formation and Abscission in Citrus and Coleus Explants 1
- Relationships between Root System Water Transport Properties and Plant Size in Phaseolus1