Fig 8.

Putative pathway of starch synthesis (a) and degradation (b) in Oryza sativa stems at early ripening stage. Italicized indicate genes analyzed in this work (see S3 Table). For genes, BE1, GWD1, AMY2A, and BAM2 shown in red, there were significant varietal difference among two HYVs. Water entry into amyloplast (shown in blue) caused by an increase in turgor pressure may be required for the initiation of starch phosphorylation by the activation of GWD, but not for PWD, followed by the elevated amylase activity to degrade starch. In b, putative water-transporting proteins (AQP) localized on the amyloplasts envelope membrane is also indicated.