Molecular regulation of sink-source transition in rice leaf sheaths during the heading period

• Autorzy: Chen H.-J. , Wang S.-J.
• Języki publikacji: EN

Abstrakty

EN

The upper leaf sheath of rice (Oryza sativa L.) serves as a temporary starch sink before heading, subsequently becoming a carbon source tissue to the growing panicle at the post-heading stage. The time of sink–source transition in upper leaf sheaths is highly correlated to the panicle exsertion. Here, we found that the expression profiles of starch synthesis genes such as ADP-glucose pyrophosphorylase large subunit 2, granule-bound starch synthase II, soluble starch synthase I, starch branching enzyme (SBE) I, SBEIII, and SBEIV were highly correlated with starch content changes during the heading period in the second leaf sheath below the flag leaf. In addition, the α-amylase2A and β-amylase were considered as major genes that were in charge of starch degradation at the postheading period. Of the five sucrose transporter (OsSUT) genes, OsSUT1 and OsSUT4 appeared to play an important role in sucrose loading into the phloem of source leaf sheaths. Moreover, the microarray-based data implied that the dominant processes associated with functional leaf sheath transition from sink to source were carbohydrate metabolism and the translocation of the carbon and nitrogen sources and inorganic phosphate.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2008
• Tom: 30
• Numer: 5
• Opis fizyczny: p.639-649,fig.,ref.

Twórcy

autor

Chen H.-J.

• Department of Agronomy, National Taiwan University, 1, Section 4, Roosevelt Rd., 106 Taipei, Taiwan

autor

Wang S.-J.

• Department of Agronomy, National Taiwan University, 1, Section 4, Roosevelt Rd., 106 Taipei, Taiwan

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