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, Hiroaki Hayashi

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1105-1109
Number of pages5
JournalPlant and Cell Physiology
Volume45
Issue number8
DOIs
Publication statusPublished - Aug 2004

Keywords

  • Antisense SPK transformant
  • Phloem sap
  • Rice
  • Sink-source interaction
  • Sucrose transport
  • Watery seeds

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