petunia axillaris/rupture

A mature stigma of Petunia hybrida ready for pollination shows 4-6 large shining drops of the exudate along with numerous smaller ones. A developing style and stigma have a columnar tissue that flares at the top. In the stigma there can be distinguished a secretory and a storage zone. In the former,

UNASSIGNED Calreticulin is involved in stabilization of the tip-focused Ca 2+ gradient and the actin cytoskeleton arrangement and function that is required for several key processes driving Petunia pollen tube tip growth. Although the precise mechanism is unclear, stabilization of a tip-focused