نتایج جستجو برای: days after pollination

تعداد نتایج: 1846585  

2014
Björn K. Klatt Andrea Holzschuh Catrin Westphal Yann Clough Inga Smit Elke Pawelzik Teja Tscharntke

Pollination improves the yield of most crop species and contributes to one-third of global crop production, but comprehensive benefits including crop quality are still unknown. Hence, pollination is underestimated by international policies, which is particularly alarming in times of agricultural intensification and diminishing pollination services. In this study, exclusion experiments with stra...

2017
Lucía Salas-Arcos Carlos Lara Juan Francisco Ornelas

BACKGROUND In many plant species, pollination syndromes predict the most effective pollinator. However, other floral visitors may also offer effective pollination services and promote mixed pollination systems. Several species of the species-rich Penstemon (Plantaginaceae) exhibit a suite of floral traits that suggest adaptation for pollination by both hymenopterans and hummingbirds. Transition...

2013
S Jha

4.11.1 Ecological Interactions 118 4.11.1.1 Pollination Services 118 4.11.1.2 Sensitivity/Vulnerability of Pollination Services 119 4.11.1.2.1 Temporal Mismatch 119 4.11.1.2.2 Spatial Mismatch 120 4.11.1.2.3 Alteration of Pollinator Networks 121 4.11.1.2.4 Simulated Biodiversity Loss or Phenological Mismatch 121 4.11.1.2.5 Network Comparison Post Habitat-Alteration 122 4.11.2 Ecosystem Service ...

Journal: :Molecular phylogenetics and evolution 2012
Valerie L Soza Johanne Brunet Aaron Liston Patricia Salles Smith Verónica S Di Stilio

Numerous studies have examined the evolution of sexual systems in angiosperms, but few explore the interaction between these and the evolution of pollination mode. Wind pollination is often associated with unisexual flowers, but which evolved first and played a causative role in the evolution of the other is unclear. Thalictrum, meadow-rues (Ranunculaceae), provides a unique opportunity to stud...

Journal: :Annals of botany 2004
Ramakrishnan M Nair Ian S Dundas Meredith Wallwork Dawn C Verlin Lyn Waterhouse Kate Dowling

BACKGROUND AND AIMS Although some taxonomic studies in the genus Trigonella have been conducted, there has been no concerted effort to study the breeding system. This paper examines the floral structure and pollination system in a population of T. balansae, an annual pasture legume. METHODS Floral morphology, hand and vector pollination, stigma receptivity, pollen tube growth, using scanning ...

2016
Dongping Tu Xiaojun Ma Huan Zhao Changming Mo Qi Tang Liuping Wang Jie Huang Limei Pan

CYP450 plays an essential role in the development and growth of the fruits of Siraitia grosvenorii. However, little is known about the SgCYP450-4 gene in S. grosvenorii. Here, based on transcriptome data, a full-length cDNA sequence of SgCYP450-4 was cloned by reverse transcriptase-polymerase chain reaction (RT-PCR) and rapid-amplification of cDNA ends (RACE) strategies. SgCYP450-4 is 1677 bp i...

Journal: :The American naturalist 2010
Giovanni Scopece Salvatore Cozzolino Steven D Johnson Florian P Schiestl

The ultimate causes of evolution of highly specialized pollination systems are little understood. We investigated the relationship between specialization and pollination efficiency, defined as the proportion of pollinated flowers relative to those that experienced pollen removal, using orchids with different pollination strategies as a model system. Rewarding orchids showed the highest pollinat...

ژورنال: :زیست شناسی گیاهی ایران 0
فرخنده رضانژاد گروه زیست شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران مهدیه شکاری گروه زیست شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران

پسته خوراکی (pistacia vera l.)، با سطح زیر کشت وسیع در ایران، اهمیت اقتصادی و تغذیه ای دارد. در پژوهش حاضر، ویژگی های ریخت شناسی و تشریحی گل ماده، اندوسپرم و لپه ها با روش سلول - بافت شناسی معمول با میکروسکوپ نوری بررسی شد. به علاوه، نمو میوه در فرایند بلوغ نیز بررسی شد. نتایج نشان داد هریک از گل های ماده در گل آذین خوشه مرکب، دارای کلاله سه بخشی، خامه کوتاه، تک پایه و مادگی نسبتا درشت است. برا...

2007
Jannice Friedman Spencer C. H. Barrett

Wind pollination is predominantly a derived condition in angiosperms and is thought to evolve in response to ecological conditions that render animal pollination less advantageous. However, the specific ecological and evolutionary mechanisms responsible for transitions from animal to wind pollination are poorly understood in comparison with other major reproductive transitions in angiosperms, i...

Journal: :Trends in plant science 2011
Myles H M Menz Ryan D Phillips Rachael Winfree Claire Kremen Marcelo A Aizen Steven D Johnson Kingsley W Dixon

Ecological restoration of plant-pollinator interactions has received surprisingly little attention, despite animal-mediated pollination underpinning reproduction of the majority of higher plants. Here, we offer a conceptual and practical framework for the ecological restoration of pollination mutualisms. Through the use of targeted restoration plantings to attract and sustain pollinators and in...

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