نتایج جستجو برای: vegetative and generative traits

تعداد نتایج: 16840975  

2016
Vladimir Kricsfalusy

Based on a study of a perennial herb Anemone patens L. (Ranunculaceae) in a variety of natural habitats in Saskatchewan, Canada, eight life stages (seed, seedling, juvenile, immature, vegetative, generative, subsenile, and senile) are distinguished and characterized in detail. The species ontogenetic growth patterns are investigated. A. patens has a long life cycle that may last for several dec...

2017
Sergey Rosbakh Annette Leingärtner Bernhard Hoiss Jochen Krauss Ingolf Steffan-Dewenter Peter Poschlod

Despite the evidence that increased frequency and magnitude of extreme climate events (ECE) considerably affect plant performance, there is still a lack of knowledge about how these events affect mountain plant biodiversity and mountain ecosystem functioning. Here, we assessed the short-term (one vegetation period) effects of simulated ECEs [extreme drought (DR), advanced and delayed snowmelt (...

2016
Ana M. González Fernando J. Yuste-Lisbona Soledad Saburido Sandra Bretones Antonio M. De Ron Rafael Lozano Marta Santalla

Determinacy growth habit and accelerated flowering traits were selected during or after domestication in common bean. Both processes affect several presumed adaptive traits such as the rate of plant production. There is a close association between flowering initiation and vegetative growth; however, interactions among these two crucial developmental processes and their genetic bases remain unex...

Journal: :Plant physiology 2005
Michele L Engel Rachel Holmes-Davis Sheila McCormick

Previously, in an effort to better understand the male contribution to fertilization, we completed a maize (Zea mays) sperm expressed sequence tag project. Here, we used this resource to identify promoters that would direct gene expression in sperm cells. We used reverse transcription-polymerase chain reaction to identify probable sperm-specific transcripts in maize and then identified their be...

Journal: :Current Biology 2005
Nicolas Rotman Anjusha Durbarry Anthony Wardle Wei Cai Yang Annie Chaboud Jean-Emmanuel Faure Frédéric Berger David Twell

In contrast to animals, the plant male germline is established after meiosis in distinctive haploid structures, termed pollen grains. The germline arises by a distinct asymmetric division of the meiotic products . The fates of the resulting vegetative and generative cells are distinct. In contrast to the larger vegetative cell, arrested in the G1 phase of the cell cycle, the smaller generative ...

2014
Sarah Schiessl Birgit Samans Bruno Hüttel Richard Reinhard Rod J. Snowdon

Flowering, the transition from the vegetative to the generative phase, is a decisive time point in the lifecycle of a plant. Flowering is controlled by a complex network of transcription factors, photoreceptors, enzymes and miRNAs. In recent years, several studies gave rise to the hypothesis that this network is also strongly involved in the regulation of other important lifecycle processes ran...

2005
LIANG SHI H. LLOYD MOGENSEN TONG ZHU STEVEN E. SMITH

Quantitative transmission electron microscopy was used to study pore density (mean pore number ± standard deviation/nuclear envelope area) on developing pollen nuclei of alfalfa. We found that pore density is essentially uniform around the vegetative nucleus (VN) at an early developmental stage (29 ±6 pores fan'), but later, •when the VN forms a close physical association with the generative ce...

Journal: :Journal of cell science 1972
P Echlin

The final stages of Helleborus pollen-grain ontogeny, which culminate in maturation and germination of the grain, have been investigated at the ultrastructural level. Following the deposition of primary and secondary exine, and during the early stages of intine formation, the microspore passes through a vacuolate phase, in which the cytoplasm appears devoid of most organelles other than the pro...

Journal: :journal of rangeland science 2013
ebrahim baghdadi ali ashraf jafari mohammad ali alizadeh amir hossain gorji

poa genus has a high value for grazing and forage conservation concerning thelivestock. in order to study the impacts of cold temperature and growing degree days(gdd) on seedling morphological trait and phonological development of two speciesinvolving poa pratensis and poa trivialis, this research was conducted in laboratory andgreenhouse and outdoor of research institute of forest and rangelan...

Journal: :The Plant cell 2004
Sheila McCormick

In a previous review of male gametophyte development (McCormick, 1993), it was noted that the two areas posed by Mascarenhas (1975) as fruitful areas for future research were the following. What are the differences in the two cytoplasms that determine the different cell fates of the generative and vegetative cells? And what are the functions of pollen-specific proteins? Now, 10 years later, the...

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