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 | Zendy

Hiroaki Shimada | Zendy; Hiroaki Koishihara | Zendy; Yayoi Saito | Zendy; Yuki Arashima | Zendy; Tomoyuki Furukawa | Zendy; Hiroaki Hayashi | Zendy

Open Access

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

Author(s) -

Hiroaki Shimada,

Hiroaki Koishihara,

Yayoi Saito,

Yuki Arashima,

Tomoyuki Furukawa,

Hiroaki Hayashi

Publication year - 2004

Publication title -

plant and cell physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.975

H-Index - 152

eISSN - 1471-9053

pISSN - 0032-0781

DOI - 10.1093/pcp/pch122

Subject(s) - sucrose , phloem , sink (geography) , starch , botany , chemistry , carbohydrate , biology , biochemistry , food science , cartography , geography

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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