نتایج جستجو برای: ovule development

تعداد نتایج: 1416363  

Journal: :Genetics 1998
S J Lolle W Hsu R E Pruitt

Postgenital organ fusion occurs most commonly during reproductive development and is important in many angiosperms during genesis of the carpel. Although a number of mutants have been described that manifest ectopic organ fusion, little is known about the genes involved in regulating this process. In this article we describe the characterization of a collection of 29 Arabidopsis mutants showing...

2006
Lars Götzenberger Walter Durka Ingolf Kühn Stefan Klotz

Hypothesis: Sex allocation theory predicts that the pollen–ovule ratio should increase linearly with increasing seed size among seed plants (Charnov, 1982). Data examined: We retrieved data for the pollen–ovule ratio, seed size, and possible confounding variables (ovule number, plant height, mating system) from a database and additional literature for 299 gymnosperm plant species of the German ...

2008
Lars Götzenberger Ingolf Kühn Walter Durka Stefan Klotz

Hypothesis: Sex allocation theory predicts that the pollen-ovule ratio should increase linearly with increasing seed size among seed plants (Charnov 1982). Data examined: We retrieved data for pollen-ovule ratio, seed size and possible confounding variables (ovule number, plant height, mating system) from a database and additional literature for 299 angyosperm plant species of the German flora....

Journal: :Annals of botany 2008
Zi-Fen Wang Yi Ren

BACKGROUND AND AIMS Ranunculaceae has a prominent phylogenetic position in Ranunculales which appears at the base of eudicots. The aims of the present paper are to reveal the features of ovule morphogenesis in different taxa and gain a better understanding of the systematics of Ranunculaceae. METHODS Flowers of 17 species from three subfamilies, nine tribes and 16 genera of Ranunculaceae, at ...

Journal: :Plant physiology 2014
Agustin Zsögön Dóra Szakonyi Xiuling Shi Mary E Byrne

Ribosomal protein mutations in Arabidopsis (Arabidopsis thaliana) result in a range of specific developmental phenotypes. Why ribosomal protein mutants have specific phenotypes is not fully known, but such defects potentially result from ribosome insufficiency, ribosome heterogeneity, or extraribosomal functions of ribosomal proteins. Here, we report that ovule development is sensitive to the l...

Journal: :The Plant journal : for cell and molecular biology 2015
Maxwell S Bush Natalie Crowe Tao Zheng John H Doonan

eIF4A is a highly conserved RNA-stimulated ATPase and helicase involved in the initiation of mRNA translation. The Arabidopsis genome encodes two isoforms, one of which (eIF4A-1) is required for the coordination between cell cycle progression and cell size. A T-DNA mutant eif4a1 line, with reduced eIF4A protein levels, displays slow growth, reduced lateral root formation, delayed flowering and ...

2017
Peter Goldblatt T. Jonathan Davies John C. Manning Michelle van der Bank Vincent Savolainen

The phylogeny of Crocoideae, the largest of four subfamilies currently recognized in Tridaceae, has eluded resolution until sequences of two more plastid DNA regions were added here to a previously published matrix containing sequences from four DNA plastid regions. Sister to the core Nivenioideae, the woody Klattia, Nivenia, and Witsenia, Crocoideae are a climax group in lridaceae, comprising ...

Journal: :The Plant cell 2014
Yuan Qin Lihua Zhao Megan I Skaggs Sebastien Andreuzza Tatsuya Tsukamoto Aneesh Panoli Kirsten N Wallace Steven Smith Imran Siddiqi Zhenbiao Yang Ramin Yadegari Ravishankar Palanivelu

In flowering plants, meiocytes develop from subepidermal cells in anthers and ovules. The mechanisms that integrate gene-regulatory processes with meiotic programs during reproductive development remain poorly characterized. Here, we show that Arabidopsis thaliana plants deficient in ACTIN-RELATED PROTEIN6 (ARP6), a subunit of the SWR1 ATP-dependent chromatin-remodeling complex, exhibit defects...

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