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AUTHOR
  J-I Cho, S-K Lee, S Ko, H-K Kim, S-H Jun, Y-H Lee, S H Bhoo, K-W Lee, G An, T-R Hahn, J-S Jeon (2005)
TITLE   Molecular cloning and expression analysis of the cell-wall invertase gene family in rice (Oryza sativa L.)
JOURNAL   Plant Cell Reports 24: 225–236
File
   OsCINs.pdf (907.2 KB) Download : 775
  The Abstract Of The Paper
Cell-wall invertase (CIN) catalyzes the hydrolysis of sucrose into glucose and fructose for supplying carbohydrates to sink organs via an apoplastic pathway. To study the CIN genes in rice (Oryza sativa L.), we isolated cDNA clones showing amino acid similarity to the plant cell wall invertase proteins from a search of rice sequence databases. Profile analyses revealed that the cloned genes are expressed in unique patterns in various organs. For example, transcripts of OsCIN1, OsCIN2, OsCIN4, and OsCIN7 were detected in immature seeds whereas OsCIN3 gene expression was flower-specific. Further transcript analysis of those genes expressed in developing seeds indicated that OsCIN1, OsCIN2, and OsCIN7 might play an important role involving sucrose partitioning to the embryo and endosperm. Sucrose, a substrate of cell-wall invertases, induced the accumulation of OsCIN1 transcripts in excised leaves and OsCIN2 in immature seeds, while the level of OsCIN5 was significantly down-regulated in excised leaves treated with sucrose. Infecting the tissues with rice blast (Magnaporthe grisea) as a biotic stressor increased the expression of OsCIN1, OsCIN4, and OsCIN5, suggesting that those genes may participate in switching metabolism to resist pathogen invasion. These results demonstrate that OsCIN genes play diverse roles involving the regulation of metabolism, growth, development, and stress responses.
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