Evidence for a common sex determination mechanism for pistil abortion in maize and in its wild relative 
            <i>Tripsacum</i>

Li, D; Blakey, C. A.; Dewald, C. L.; Dellaporta, S.L.

doi:10.1073/pnas.94.8.4217

Cited by 47 publications

(31 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although there is no previous organogenic study of inflorescence development in T. dactyloides, an examination of Camara-Hernandez and Gambino's (1992) structural study of T. dactyloides reveals a single photograph of an early spike-like raceme, and the investigation of Li et al (1997) exhibits photographic evidence showing late floret development in the wild type and the gynomonoecious mutant (gsf1) of gamagrass. Although there is no previous organogenic study of inflorescence development in T. dactyloides, an examination of Camara-Hernandez and Gambino's (1992) structural study of T. dactyloides reveals a single photograph of an early spike-like raceme, and the investigation of Li et al (1997) exhibits photographic evidence showing late floret development in the wild type and the gynomonoecious mutant (gsf1) of gamagrass.…”

mentioning

confidence: 99%

Analysis of inflorescence organogenesis in eastern gamagrass, Tripsacum dactyloides (Poaceae): the wild type and the gynomonoecious gsf1 mutant

Orr

Kaparthi

Dewald

et al. 2001

American J of Botany

View full text Add to dashboard Cite

Inflorescence organogenesis of a wild-type and a gynomonoecious (pistillate) mutant in Tripsacum dactyloides was studied using scanning electron microscopy. SEM (scanning electron microscope) analysis indicated that wild-type T. dactyloides (Eastern gamagrass) expressed a pattern of inflorescence organogenesis that is observed in other members of the subtribe Tripsacinae (Zea: maize and teosinte), family Poaceae. Branch primordia are initiated acropetally along the rachis of wild-type inflorescences in a distichous arrangement. Branch primordia at the base of some inflorescences develop into long branches, which themselves produce an acropetal series of distichous spikelet pair primordia. All other branch primordia function as spikelet pair primordia and bifurcate into pedicellate and sessile spikelet primordia. In all wild-type inflorescences development of the pedicellate spikelets is arrested in the proximal portion of the rachis, and these spikelets abort, leaving two rows of solitary sessile spikelets. Organogenesis of spikelets and florets in wild-type inflorescences is similar to that previously described in maize and the teosintes. Our analysis of gsf1 mutant inflorescences reveals a pattern of development similar to that of the wild type, but differs from the wild type in retaining (1) the pistillate condition in paired spikelets along the distal portion of the rachis and (2) the lower floret in sessile spikelets in the proximal region of the rachis. The gsf1 mutation blocks gynoecial tissue abortion in both the paired-spikelet and the unpaired-spikelet zone. This study supports the hypothesis that both femaleness and maleness in Zea and Tripsacum inflorescences are derived from a common developmental pathway. The pattern of inflorescence development is not inconsistent with the view that the maize ear was derived from a Tripsacum genomic background.

show abstract

mentioning

confidence: 99%

Analysis of inflorescence organogenesis in eastern gamagrass, Tripsacum dactyloides (Poaceae): the wild type and the gynomonoecious gsf1 mutant

Orr

Kaparthi

Dewald

et al. 2001

American J of Botany

View full text Add to dashboard Cite

show abstract

“…In addition, genes isolated from relatives of T. dactyloides (especially maize) might serve as markers to study, for example, the expression of cell cycle or regulatory genes during parthenogenesis. Genes from T. dactyloides are syntenic in maize (Blakey et al , 2001Li et al 1997;Grimanelli et al 1998;Takahashi et al 1999) and homologous genes of both species share a high degree of sequence identity (Li et al 1997;Hilton and Gaut 1998;J. Bantin and T. Dresselhaus, unpublished results), which suggests T. dactyloides as a good natural model system to analyze the molecular nature of parthenogenesis in a higher plant species in future experimentation.…”

Section: Introductionmentioning

confidence: 92%

Tripsacum dactyloides (Poaceae): a natural model system to study parthenogenesis

Bantin

Matzk

Dresselhaus³

2001

Sex Plant Reprod

View full text Add to dashboard Cite

Diplosporous apomeiosis, formation of unreduced embryo sacs primarily of the Antennaria type, followed by parthenogenetic embryo development and pseudogamy (fertilization of the central cell) describe gametophytic apomixis within the Tripsacum agamic complex. Tripsacum dactyloides (Eastern gamagrass) is a close relative of domesticated maize and was chosen as a natural model system to investigate gene expression patterns associated with parthenogenesis. The genome size of diploid sexual and polyploid apomictic T. dactyloides was estimated by flow cytometry to be 7.37 pg (2C), 14.74 pg (4C) and 22.39 pg (6C), respectively. The diploid genome size is thus approximately 1.35× larger than that of maize. The apomeiotic-pseudogamous pathway of seed formation was demonstrated at a rate of 92% by the flow cytometric seed screen (FCSS) with single mature seeds in tetraploid accessions. This number includes twin embryos which were detected in 13% of the seeds analyzed. Fertilization of unreduced egg cells (BIII hybrids) was measured in 10% of apomictic seeds. Autonomous (fertilization-independent) embryo development and fertilization-dependent endosperm formation were confirmed by pollination of tetraploid T. dactyloides with a diploid transgenic maize line carrying an actin:: β -glucuronidase (GUS) reporter construct. GUS expression was detected after pollination in the developing endosperm, but not in the embryo. In similar intraspecific crossing experiments with maize, GUS expression was detected in both the embryo and endosperm. A protocol was established for microdissection of embryo sacs and early parthenogenetic embryos of T. dactyloides. Together, these techniques provide new tools for future studies aimed at comparing gene expression patterns between sexual maize and sexual or apomictic T. dactyloides.

show abstract

“…TASSELSEED2 (TS2) encodes short-chain dehydrogenase/reductase and plays a role in programmed cell death of the carpel in the tassel flowers (DeLong et al 1993). TS2 cell death also occurs in a close relative of maize, Tripsacum (Li et al 1997). Programmed cell death in the gynoecium may be a characteristic pattern in diverse panicoid grasses (Le Roux and Kellogg 1999).…”

Section: Stamens and Carpelsmentioning

confidence: 99%

Grass Spikelet Genetics and Duplicate Gene Comparisons

Zanis

2007

International Journal of Plant Sciences

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences.The grass spikelet contains floral organs such as stamens and carpels, as well as additional organs, glumes, lemma, palea, and lodicules that are unique to the angiosperms. Recent work is beginning to shed light onto the genes that regulate the development of spikelet organs. Many of these genes are members of multigene families. These multigene families have formed through gene duplications, some of which are specific to the grass family. I review the recent progress made in understanding the genetics of grass spikelet development. As many of these genes begin to be isolated, they will likely be compared with homologous genes from other angiosperms. Given that some of these genes will be duplicate genes, I provide a set of examples showing how orthologues and paralogues should be compared.

show abstract

Evidence for a common sex determination mechanism for pistil abortion in maize and in its wild relative Tripsacum

Cited by 47 publications

References 24 publications

Analysis of inflorescence organogenesis in eastern gamagrass, Tripsacum dactyloides (Poaceae): the wild type and the gynomonoecious gsf1 mutant

Analysis of inflorescence organogenesis in eastern gamagrass, Tripsacum dactyloides (Poaceae): the wild type and the gynomonoecious gsf1 mutant

Tripsacum dactyloides (Poaceae): a natural model system to study parthenogenesis

Grass Spikelet Genetics and Duplicate Gene Comparisons

Contact Info

Product

Resources

About