Journal Article

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 Shimada, Hiroaki Koishihara, Yayoi Saito, Yuki Arashima, Tomoyuki Furukawa and Hiroaki Hayashi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 8, pages 1105-1109
Published in print August 2004 | ISSN: 0032-0781
Published online August 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch122
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

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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.

Keywords: Keywords: Antisense SPK transformant — Phloem sap — Rice — Sink–source interaction — Sucrose transport — Watery seeds.; Abbreviations: CDPK, calmodulin-like domain protein kinase.

Journal Article.  2994 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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