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Plant and Cell Physiology 2004 45(8):1105-1109; doi:10.1093/pcp/pch122
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© 2004 Oxford University Press

Short Communication

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

Hiroaki Shimada1,2,4, Hiroaki Koishihara1, Yayoi Saito1, Yuki Arashima1, Tomoyuki Furukawa2 and Hiroaki Hayashi3

1 Department of Biological Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, 278-8510 Japan
2 Tissue Engineering Research Center, Tokyo University of Science, Yamazaki 2641, Noda, 278-8510 Japan
3 Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo, Tokyo, 113-8657 Japan

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.

Footnotes

4 Corresponding author: E-mail, shimadah{at}rs.noda.tus.ac.jp; Fax, +81-4-7125-1841.


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