Calreticulin is required for calcium homeostasis and proper pollen tube tip growth in Petunia.

ABSTRACT:

Main conclusion

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 calcium (Ca²⁺) gradient seems to be critical for pollen germination and pollen tube growth. We hypothesize that calreticulin (CRT), a Ca²⁺-binding/buffering chaperone typically residing in the lumen of the endoplasmic reticulum (ER) of eukaryotic cells, is an excellent candidate to fulfill this role. We previously showed that in Petunia pollen tubes growing in vitro, CRT is translated on ER membrane-bound ribosomes that are abundant in the subapical zone

SUBMITTER: Suwinska A 

PROVIDER: S-EPMC5391374 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature