A rice antisense SPK transformant that lacks the accumulation of seed storage substances shows no correlation between sucrose concentration in phloem sap and demand for carbon sources in the sink organs.
Plant Cell Physiol
; 45(8): 1105-9, 2004 Aug.
Article
em En
| MEDLINE
| ID: mdl-15356337
ABSTRACT
Rice SPK is a calmodulin-like domain protein kinase specific to immature seeds and promotes the degradation of sucrose. Therefore, antisense SPK transformants showed a defective production of storage starch, but accumulated sucrose in watery seeds. Despite a reduced sink strength, no difference was found in the sucrose concentration in phloem sap of the transformants and wild-type plants, which increased after floral organ induction to levels greater than 500 mM. However, sucrose was detected at relatively lower levels in the watery seed sap. These results suggest that sucrose content in the phloem is regulated independently from the demand for carbon sources in the sink organs.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas Quinases
/
Oryza
/
Sacarose
/
Transformação Genética
/
Oligonucleotídeos Antissenso
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article