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. 2018 Aug 8;9:1060. doi: 10.3389/fpls.2018.01060

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Copyright © 2018 Schmitt, Roy, Klinkenberg, Jia and Carter.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Proposed model of jasmonic acid migration after synthesis in the filament and regulation of nectar secretion. (A) JA synthesized in the anther filament migrates down the filament to the nectary to promote nectar secretion, and travels to the anther where it promotes the dehiscence of anthers and pollen maturation. (B) JA regulation of nectar secretion. Under standard conditions, JA or its precursors are synthesized in the filament leading to the induction of MYB21 expression which in turn is required for nectar secretion via the expression of SWEET9 and CWINV4. JA also regulates auxin responses within the nectaries, another hormonal factor involved in nectar secretion. A possible role for a JA- and COI1-dispensible pathway via OPDA for nectar secretion is indicated; dashed arrows represent hypothetical interactions based on limited data.