نتایج جستجو برای: pistil

تعداد نتایج: 670  

Journal: :Plant physiology 2010
Alexandra M Allen Christian Lexer Simon J Hiscock

Fertilization in angiosperms depends on a complex cellular "courtship" between haploid pollen and diploid pistil. These pollen-pistil interactions are regulated by a diversity of molecules, many of which remain to be identified and characterized. Thus, it is unclear to what extent these processes are conserved among angiosperms, a fact confounded by limited sampling across taxa. Here, we report...

Journal: :Development 1999
A Calderon-Urrea S L Dellaporta

The formation of unisexual flowers in maize requires the selective elimination and sexual maturation of floral organs in an initially bisexual floral meristem. Elimination of pistil primordia occurs in the primary and secondary florets of the tassel spikelets, and in the secondary florets of ear spikelets. Ill-fated pistil cells undergo a cell death process associated with nuclear degeneration ...

Journal: :Annals of botany 2011
Alexandra M Allen Christopher J Thorogood Matthew J Hegarty Christian Lexer Simon J Hiscock

BACKGROUND Pollen-pistil interactions are an essential prelude to fertilization in angiosperms and determine compatibility/incompatibility. Pollen-pistil interactions have been studied at a molecular and cellular level in relatively few families. Self-incompatibility (SI) is the best understood pollen-pistil interaction at a molecular level where three different molecular mechanisms have been i...

Journal: :Plant physiology 2009
Andréa C Quiapim Michael S Brito Luciano A S Bernardes Idalete Dasilva Iran Malavazi Henrique C DePaoli Jeanne B Molfetta-Machado Silvana Giuliatti Gustavo H Goldman Maria Helena S Goldman

The success of plant reproduction depends on pollen-pistil interactions occurring at the stigma/style. These interactions vary depending on the stigma type: wet or dry. Tobacco (Nicotiana tabacum) represents a model of wet stigma, and its stigmas/styles express genes to accomplish the appropriate functions. For a large-scale study of gene expression during tobacco pistil development and prepara...

Journal: :Wiley interdisciplinary reviews. Developmental biology 2012
Ravishankar Palanivelu Tatsuya Tsukamoto

Sexual reproduction in flowering plants is unique in multiple ways. Distinct multicellular gametophytes contain either a pair of immotile, haploid male gametes (sperm cells) or a pair of female gametes (haploid egg cell and homodiploid central cell). After pollination, the pollen tube, a cellular extension of the male gametophyte, transports both male gametes at its growing tip and delivers the...

Journal: :Biochemical Society transactions 2010
Ravishankar Palanivelu Mark A Johnson

The pollen tube represents an attractive model system for functional genomic analysis of the cell-cell interactions that mediate guided cellular growth. The pollen tube extends through pistil tissues and responds to guidance cues that direct the tube towards an ovule, where it releases sperm for fertilization. Pollen is readily isolated from anthers, where it is produced, and can be induced to ...

2017
Yanming Deng Xiaobo Sun Chunsun Gu Xinping Jia Lijian Liang Jiale Su

Crosses among single-, double- and multi-petal jasmine cultivars (Jasminum sambac Aiton) are unable to easily generate hybrids. To identify the reproductive barriers restricting hybrid set, dynamic changes in jasmine pollen viability and pistil receptivity were compared at different flowering stages. Pollen-pistil interactions in six reciprocal crosses were also investigated to characterize pol...

2017
Kentaro Ezura Kim Ji-Seong Kazuki Mori Yutaka Suzuki Satoru Kuhara Tohru Ariizumi Hiroshi Ezura

Fruit set involves the developmental transition of an unfertilized quiescent ovary in the pistil into a fruit. While fruit set is known to involve the activation of signals (including various plant hormones) in the ovary, many biological aspects of this process remain elusive. To further expand our understanding of this process, we identified genes that are specifically expressed in tomato (Sol...

2014
Jin Yu Swapan Kumar Roy Abu Hena Mostafa Kamal Kun Cho Soo-Jeong Kwon Seong-Woo Cho Yoon-Sup So James B. Holland Sun Hee Woo

Gametophytic factors mediate pollen-pistil interactions in maize (Zea mays L.) and play active roles in limiting gene flow among maize populations and between maize and teosinte. This study was carried out to identify proteins and investigate the mechanism of gametophytic factors using protein analysis. W22 (ga1); which did not carry a gametophytic factor and W22 (Ga1), a near iso-genic line, w...

2014
Ambika Chandra David R. Huff

Sex expression of dioecious buffalograss [Bouteloua dactyloides Columbus (syn. Buchloë dactyloides (Nutt.) Engelm.)] is known to be environmentally stable with approximate 1:1, male to female, sex ratios. Here we show that infection by the pistil smut fungus [Salmacisia buchloëana Huff & Chandra (syn. Tilletia buchloëana Kellerman and Swingle)] shifts sex ratios of buffalograss to be nearly...

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