Angiosperm Flora of India

The SPOROCYTELESS/NOZZLE Gene Is Involved in Controlling Stamen Identity in Arabidopsis

Publication Type:Journal Article
Year of Publication:2009
Authors:Liu, X, Huang, J, Parameswaran, S, Ito, T, Seubert, B, Auer, M, Rymaszewski, A, Jia, G, Owen, HA, Zhao, D
Journal:Plant Physiology
Date Published:2009
ISBN Number:00320889

The stamen, which consists of an anther and a filament, is the male reproductive organ in a flower. The specification of stamen identity in Arabidopsis (Arabidopsis thaliana) is controlled by a combination of the B genes APETALA3 (AP3) and PISTILLATA, the C gene AGAMOUS (AG), and the E genes SEPALLATA1 (SEP1) to SEP4. The "floral organ-building" gene SPOROCYTELESS/NOZZLE (SPL/NZZ) plays a central role in regulating anther cell differentiation. However, much less is known about how "floral organ identity" and floral organ-building genes interact to control floral organ development. In this study, we report that ectopie expression of SPL/NZZ not only affects flower development in the wild-type background but also leads to the transformation of petal-like organs into stamen-like organs in flowers of ap2-1, a weak ap2 mutant alíele. Moreover, our loss-offunction analysis indicates that the spl/nzz mutant enhances the phenotype of the ag weak alíele ag-4. Furthermore, ectopie expression and overexpression of SPL/NZZ altered expression of AG, SEP3, and API in rosette leaves and flowers, while ectopie expression of SPL/NZZ resulted in ectopie expression of AG and SEP3 in the outer whorls of flowers. Our results indicate that the SPL/NZZ gene is engaged in controlling stamen identity via interacting with genes required for stamen identity in Arabidopsis.

Short Title:Plant Physiology
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