نتایج جستجو برای: ovule development

تعداد نتایج: 1416363  

Journal: :Cell 1995
Leonore Reiser Zora Modrusan Linda Margossian Alon Samach Nir Ohad George W. Haughn Robert L. Fischer

Ovule development in Arabidopsis involves the formation of three morphologically defined proximal-distal pattern elements. Integuments arise from the central pattern element. Analysis of Bell 1 (Bel 1) mutant ovules indicated that BEL1 was required for integument development. Cloning of the BEL1 locus reveals that it encodes a homeodomain transcription factor. Prior to integument initiation, BE...

Journal: :Plant physiology 2016
María Dolores Gomez Daniel Ventimilla Raquel Sacristan Miguel A Perez-Amador

Gibberellins (GAs) are plant hormones that regulate most plant life cycle aspects, including flowering and fruit development. Here, we demonstrate the implication of GAs in ovule development. DELLA proteins, negative GA response regulators, act as positive factors for ovule integument development in a mechanism that involves transcription factor ABERRANT TESTA SHAPE (ATS). The seeds of the dell...

Journal: :The Plant cell 2004
Hitoshi Nakagawa Silvia Ferrario Gerco C Angenent Akira Kobayashi Hiroshi Takatsuji

Arabidopsis (Arabidopsis thaliana) SUPERMAN (SUP) plays a role in establishing a boundary between whorls 3 and 4 of flowers and in ovule development. We characterized a Petunia hybrida (petunia) homolog of SUP, designated PhSUP1, to compare with SUP. Genomic DNA of the PhSUP1 partially restored the stamen number and ovule development phenotypes of the Arabidopsis sup mutant. Two P. hybrida line...

Journal: :American journal of botany 1999
T L Sage F Strumas W W Cole S C Barrett

Self-pollination results in significantly lower seed set than cross-pollination in tristylous Narcissus triandrus. We investigated structural and functional aspects of pollen-pistil interactions and ovule-seed development following cross- and self-pollination to assess the timing and mechanism of self-sterility. Ovule development within an ovary was asynchronous at anthesis. There were no signi...

Journal: :علوم باغبانی ایران 0
علی عبادی استاد، گروه علوم باغبانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران مصطفی عالی فر دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران محمدرضا فتاحی مقدم دانشیار، گروه علوم باغبانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران اصغر استاجی دانشجوی سابق کارشناسی ارشد، گروه علوم باغبانی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران

flame seedless is one of the most important and commercial table grape cultivar that is used for breeding program due to its specific characteristics of fruit high production. in order to breed new seedless grape cultivars and with considering importance of selecting seedless varieties as a female parent to increase the production rate of seedless offspring in a breeding cycle, embryo rescue te...

Journal: :Plant physiology 2013
Takashi Okada Yingkao Hu Matthew R Tucker Jennifer M Taylor Susan D Johnson Andrew Spriggs Tohru Tsuchiya Karsten Oelkers Julio C M Rodrigues Anna M G Koltunow

Hieracium praealtum forms seeds asexually by apomixis. During ovule development, sexual reproduction initiates with megaspore mother cell entry into meiosis and formation of a tetrad of haploid megaspores. The sexual pathway ceases when a diploid aposporous initial (AI) cell differentiates, enlarges, and undergoes mitosis, forming an aposporous embryo sac that displaces sexual structures. Embry...

2002
Gerco C. Angenent John Franken Marco Busscher Anja van Dijken

We isolated and characterized two ovule-specific MADS box cDNAs from petunia, designated floral binding protein (fbp) genes 7 and 11. The putative protein products of these genes have -90% of their overall amino acid sequence in common. In situ RNA hybridization experiments revealed that both genes are expressed in the center of the developing gynoecium before ovule primordia are visible. At la...

Journal: :Current opinion in plant biology 2014
Matthew R Tucker Anna M G Koltunow

The formation of female gametes in plants occurs within the ovule, a floral organ that is also the precursor of the seed. Unlike animals, plants lack a typical germline separated from the soma early in development and rely on positional signals, including phytohormones, mobile mRNAs and sRNAs, to direct diploid somatic precursor cells onto a reproductive program. In addition, signals moving bet...

Journal: :Development 2012
Dior R Kelley Alexandra Arreola Thomas L Gallagher Charles S Gasser

KANADI (KAN) transcription factors promote abaxial cell fate throughout plant development and are required for organ formation during embryo, leaf, carpel and ovule development. ABERRANT TESTA SHAPE (ATS, or KAN4) is necessary during ovule development to maintain the boundary between the two ovule integuments and to promote inner integument growth. Yeast two-hybrid assays identified ETTIN (ETT,...

2016
Jia-Gang Wang Chong Feng Hai-Hong Liu Fu-Rong Ge Sha Li Hong-Ju Li Yan Zhang

Planar morphogenesis, a distinct feature of multicellular organisms, is crucial for the development of ovule, progenitor of seeds. Both receptor-like kinases (RLKs) such as STRUBBELIG (SUB) and auxin gradient mediated by PIN-FORMED1 (PIN1) play instructive roles in this process. Fine-tuned intercellular communications between different cell layers during ovule development demands dynamic membra...

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