Heat stress causes alterations in the cell-wall polymers and anatomy of coffee leaves (Coffea arabica L.).
Carbohydr Polym
; 93(1): 135-43, 2013 Mar 01.
Article
en En
| MEDLINE
| ID: mdl-23465912
Coffee plants were subjected to heat stress (37 °C) and compared with control plants (24 °C). Cell wall polysaccharides were extracted using water (W), EDTA (E) and 4M NaOH (H30 and H70). In addition, monolignols were analyzed, and the leaves were observed by microscopy. Plants under heat stress accumulated higher contents of arabinose and galactose in fraction W. Xylose contents were observed to decrease in H30 fractions after the heat stress, whereas galactose and uronic acid increased. H70 fractions from plants exposed to heat stress showed increased xylose contents, whereas the contents of arabinose and glucose decreased. Differences in the molar-mass profiles of polysaccharides were also observed. The primary monolignol contents increased after the heat stress. Structural alterations in palisade cells and ultrastructural damage in chloroplasts were also observed. Our results demonstrate that the chemical profile of coffee cell-wall polymers and structural cell anatomy change under heat stress.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Estrés Fisiológico
/
Pared Celular
/
Hojas de la Planta
/
Coffea
Tipo de estudio:
Etiology_studies
Idioma:
En
Revista:
Carbohydr Polym
Año:
2013
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Reino Unido