Reference "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"

Reference ID

11502

Title

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

Source

Plant & cell physiology, 2004, vol. 45, pp. 1105-1109

Authors (6)

Shimada-H	Koishihara-H
Saito-Y	Arashima-Y
Furukawa-T	Hayashi-H

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.