NDLI: The Maize MADS Box Gene ZmMADS3 Affects Node Number and Spikelet Development and Is Co-Expressed with ZmMADS1 during Flower Development, in Egg Cells, and Early Embryogenesis1

Content Provider	PubMed Central
Author	Heuer, Sigrid Hansen, Susanne Bantin, Jörg Brettschneider, Reinhold Kranz, Erhard Horst, Lörz Dresselhaus, Thomas
Copyright Year	2001
Abstract	MADS box genes represent a large gene family of transcription factors with essential functions during flower development and organ differentiation processes in plants. Addressing the question of whether MADS box genes are involved in the regulation of the fertilization process and early embryo development, we have isolated two novel MADS box cDNAs, ZmMADS1 and ZmMADS3, from cDNA libraries of maize (Zea mays) pollen and egg cells, respectively. The latter gene is allelic to ZAP1. Transcripts of both genes are detectable in egg cells and in in vivo zygotes of maize. ZmMADS1 is additionally expressed in synergids and in central and antipodal cells. During early somatic embryogenesis, ZmMADS1 expression is restricted to cells with the capacity to form somatic embryos, and to globular embryos at later stages. ZmMADS3 is detectable only by more sensitive reverse transcriptase-PCR analyses, but is likewise expressed in embryogenic cultures. Both genes are not expressed in nonembryogenic suspension cultures and in isolated immature and mature zygotic embryos. During flower development, ZmMADS1 and ZmMADS3 are co-expressed in all ear spikelet organ primordia at intermediate stages. Among vegetative tissues, ZmMADS3 is expressed in stem nodes and displays a gradient with highest expression in the uppermost node. Transgenic maize plants ectopically expressing ZmMADS3 are reduced in height due to a reduced number of nodes. Reduction of seed set and male sterility were observed in the plants. The latter was due to absence of anthers. Putative functions of the genes during reproductive and vegetative developmental processes are discussed.
Starting Page	33
File Format	PDF
ISSN	15322548
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	1
Volume Number	127
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2001-09-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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