Cell Calcium
College of Horticulture, Qingdao Agricultural University, No. 700 Changcheng Road, Chengyang, Qingdao City 266109, Shandong Province, China. Electronic address:
Published: November 2016
In S-RNase-based self-incompatibility, S-RNase was previously thought to function as a selective RNase that inhibits pollen whose S-haplotype matches that in the pistil. In this study, we showed that S-RNase has a distinct effect on the regulation of Ca-permeable channel activity in the apical pollen tube in Pyrus pyrifolia. While non-self S-RNase has no effect, self S-RNase decreases the activity of Ca channels and disrupts the Ca gradient at the tip of the growing pollen tube during the gametophytic self-incompatibility (GSI) response. Extracellular Ca influx was suppressed 5min after self S-RNase treatment, and self-pollen tube growth was reduced at 50min after self S-RNase treatment. In the self-incompatible response, the expression of Ca-related genes was inhibited before RNA degradation. Therefore, self S-RNase suppresses Ca influx prior to arresting pollen tube growth via RNA degradation.
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http://dx.doi.org/10.1016/j.ceca.2016.06.006 | DOI Listing |
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