The Nature of the Arabidopsis fon1 Mutations

The Nature of the Arabidopsis fon1 Mutations Hai Huang b and Hong Ma a a Cold Spring Harbor Laboratory Cold Spring Harbor, New York 11724 mah@cshl.org b Current address: Center for Life Sciences Academia Sinica Shanghai, China Recently, we described three similar Arabidopsis mutants, floral organ number ( fon ) 1-1 , fon1-2 , and fon1-3 , that each exhibit an increased number of stamens and carpels (Huang and Ma 1997 ). Although these phenotypes resemble those conditioned by weak alleles of superman ( sup ), on the basis of results from the experiments outlined below, we originally concluded that SUP and FON1 are closely linked but distinct genes that share related functions (Huang and Ma 1997 ). However, in light of recently obtained data (Jacobsen and Meyerowitz 1997 ; S.E. Jacobsen and E.M. Meyerowitz, personal communication), we now find that a more plausible explanation of our results is that fon1 mutations are actually epigenetic alleles of SUP. We determined that FON1 and SUP are closely linked during restriction fragment length polymorphism (RFLP) mapping experiments with 48 fon1 F 2 plants. These analyses indicated that FON1 is located on chromosome 3, ~15 cM from the marker GL1. Because previous studies had reported that GL1 is http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

The Nature of the Arabidopsis fon1 Mutations

Jan 1, 1998

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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.10.1.3
Publisher site
See Article on Publisher Site

Abstract

Hai Huang b and Hong Ma a a Cold Spring Harbor Laboratory Cold Spring Harbor, New York 11724 mah@cshl.org b Current address: Center for Life Sciences Academia Sinica Shanghai, China Recently, we described three similar Arabidopsis mutants, floral organ number ( fon ) 1-1 , fon1-2 , and fon1-3 , that each exhibit an increased number of stamens and carpels (Huang and Ma 1997 ). Although these phenotypes resemble those conditioned by weak alleles of superman ( sup ), on the basis of results from the experiments outlined below, we originally concluded that SUP and FON1 are closely linked but distinct genes that share related functions (Huang and Ma 1997 ). However, in light of recently obtained data (Jacobsen and Meyerowitz 1997 ; S.E. Jacobsen and E.M. Meyerowitz, personal communication), we now find that a more plausible explanation of our results is that fon1 mutations are actually epigenetic alleles of SUP. We determined that FON1 and SUP are closely linked during restriction fragment length polymorphism (RFLP) mapping experiments with 48 fon1 F 2 plants. These analyses indicated that FON1 is located on chromosome 3, ~15 cM from the marker GL1. Because previous studies had reported that GL1 is

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