Arabidopsis CUP-SHAPED COTYLEDON3 Regulates Postembryonic Shoot Meristem and Organ Boundary Formation

Arabidopsis CUP-SHAPED COTYLEDON3 Regulates Postembryonic Shoot Meristem and Organ Boundary... Overall shoot architecture in higher plants is highly dependent on the activity of embryonic and axillary shoot meristems, which are produced from the basal adaxial boundaries of cotyledons and leaves, respectively. In Arabidopsis thaliana , redundant functions of the CUP-SHAPED COTYLEDON genes CUC1 , CUC2 , and CUC3 regulate embryonic shoot meristem formation and cotyledon boundary specification. Their functional importance and relationship in postembryonic development, however, is poorly understood. Here, we performed extensive analyses of the embryonic and postembryonic functions of the three CUC genes using multiple combinations of newly isolated mutant alleles. We found significant roles of CUC2 and CUC3 , but not CUC1 , in axillary meristem formation and boundary specification of various postembryonic shoot organs, such as leaves, stems, and pedicels. In embryogenesis, all three genes make significant contributions, although CUC3 appears to possess, at least partially, a distinct function from that of CUC1 and CUC2 . The function of CUC3 and CUC2 overlaps that of LATERAL SUPPRESSOR , which was previously shown to be required for axillary meristem formation. Our results reveal that redundant but partially distinct functions of CUC1 , CUC2 , and CUC3 are responsible for shoot organ boundary and meristem formation throughout the life cycle in Arabidopsis . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Arabidopsis CUP-SHAPED COTYLEDON3 Regulates Postembryonic Shoot Meristem and Organ Boundary Formation

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Publisher
American Society of Plant Biologist
Copyright
Copyright © 2015 by the American Society of Plant Biologists
ISSN
1040-4651
eISSN
1532-298X
D.O.I.
10.1105/tpc.106.045716
Publisher site
See Article on Publisher Site

Abstract

Overall shoot architecture in higher plants is highly dependent on the activity of embryonic and axillary shoot meristems, which are produced from the basal adaxial boundaries of cotyledons and leaves, respectively. In Arabidopsis thaliana , redundant functions of the CUP-SHAPED COTYLEDON genes CUC1 , CUC2 , and CUC3 regulate embryonic shoot meristem formation and cotyledon boundary specification. Their functional importance and relationship in postembryonic development, however, is poorly understood. Here, we performed extensive analyses of the embryonic and postembryonic functions of the three CUC genes using multiple combinations of newly isolated mutant alleles. We found significant roles of CUC2 and CUC3 , but not CUC1 , in axillary meristem formation and boundary specification of various postembryonic shoot organs, such as leaves, stems, and pedicels. In embryogenesis, all three genes make significant contributions, although CUC3 appears to possess, at least partially, a distinct function from that of CUC1 and CUC2 . The function of CUC3 and CUC2 overlaps that of LATERAL SUPPRESSOR , which was previously shown to be required for axillary meristem formation. Our results reveal that redundant but partially distinct functions of CUC1 , CUC2 , and CUC3 are responsible for shoot organ boundary and meristem formation throughout the life cycle in Arabidopsis .

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