scholarly journals A Comparison of Two Nicotiana attenuata Accessions Reveals Large Differences in Signaling Induced by Oral Secretions of the Specialist Herbivore Manduca sexta

2008 ◽  
Vol 146 (3) ◽  
pp. 927-939 ◽  
Author(s):  
Jianqiang Wu ◽  
Christian Hettenhausen ◽  
Meredith C. Schuman ◽  
Ian T. Baldwin
Keyword(s):  
Manduca Sexta ◽  
Nicotiana Attenuata ◽  
Oral Secretions ◽  
Specialist Herbivore

scholarly journals Shifting Nicotiana attenuata 's diurnal rhythm does not alter its resistance to the specialist herbivore Manduca sexta

2016 ◽  
Vol 58 (7) ◽  
pp. 656-668 ◽  
Author(s):  
Jasmin Herden ◽  
Stefan Meldau ◽  
Sang-Gyu Kim ◽  
Grit Kunert ◽  
Youngsung Joo ◽  
...  
Keyword(s):  
Manduca Sexta ◽  
Diurnal Rhythm ◽  
Nicotiana Attenuata ◽  
Specialist Herbivore

scholarly journals Molecular Interactions between the Specialist Herbivore Manduca sexta (Lepidoptera, Sphingidae) and Its Natural Host Nicotiana attenuata. VII. Changes in the Plant's Proteome

2006 ◽  
Vol 142 (4) ◽  
pp. 1621-1641 ◽  
Author(s):  
Ashok P. Giri ◽  
Hendrik Wünsche ◽  
Sirsha Mitra ◽  
Jorge A. Zavala ◽  
Alexander Muck ◽  
...  
Keyword(s):  
Manduca Sexta ◽  
Molecular Interactions ◽  
Natural Host ◽  
Nicotiana Attenuata ◽  
Specialist Herbivore

scholarly journals Hawkmoths evaluate scenting flowers with the tip of their proboscis

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Alexander Haverkamp ◽  
Felipe Yon ◽  
Ian W Keesey ◽  
Christine Mißbach ◽  
Christopher Koenig ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Manduca Sexta ◽  
Ecosystem Service ◽  
Floral Scent ◽  
Nicotiana Attenuata ◽  
Floral Volatiles ◽  
Pollen Transfer ◽  
Olfactory Neurons ◽  
Molecular Analyses ◽  
Choice Tests

Pollination by insects is essential to many ecosystems. Previously, we have shown that floral scent is important to mediate pollen transfer between plants (<xref ref-type="bibr" rid="bib16">Kessler et al., 2015</xref>). Yet, the mechanisms by which pollinators evaluate volatiles of single flowers remained unclear. Here, Nicotiana attenuata plants, in which floral volatiles have been genetically silenced and its hawkmoth pollinator, Manduca sexta, were used in semi-natural tent and wind-tunnel assays to explore the function of floral scent. We found that floral scent functions to increase the fitness of individual flowers not only by increasing detectability but also by enhancing the pollinator's foraging efforts. Combining proboscis choice tests with neurophysiological, anatomical and molecular analyses we show that this effect is governed by newly discovered olfactory neurons on the tip of the moth's proboscis. With the tip of their tongue, pollinators assess the advertisement of individual flowers, an ability essential for maintaining this important ecosystem service.

scholarly journals An evolutionary hourglass of herbivore-induced transcriptomic responses in Nicotiana attenuata

2015 ◽  
Author(s):  
Matthew Durrant ◽  
Justin Boyer ◽  
Ian T. Baldwin ◽  
Shuqing Xu
Keyword(s):  
Nicotiana Attenuata ◽  
Biological Processes ◽  
Oral Secretions ◽  
Middle Stage ◽  
Signal Perception ◽  
Induced Defences ◽  
Elicitation Process ◽  
Transcriptomic Responses

Herbivore induced defences are robust, evolve rapidly and activated in plants when specific elicitors, frequently found in the herbivores' oral secretions (OS) are introduced into wounds during attack. How these complex induced defences evolve remains unclear. Here, we show that herbivore-induced transcriptomic responses in a wild tobacco, Nicotiana attenuata, display an evolutionary hourglass: the pattern that characterises the transcriptomic evolution of embryogenesis in animals, plants, and fungi. While relatively young and rapidly evolving genes involved in signal perception and processing to regulate defence metabolite biosynthesis are recruited both early (1 h) and late (9-21 h) in the defence elicitation process, a group of highly conserved and older genes involved in transcriptomic regulation are activated in the middle stage (5 h). The appearance of the evolutionary hourglass architecture in both developmental and defence elicitation processes may reflect the importance of robustness and evolvability in the signalling of these important biological processes.

scholarly journals Variation in Manduca sexta Pollination-Related Floral Traits and Reproduction in a Wild Tobacco Plant

2021 ◽  
Vol 9 ◽  
Author(s):  
Julia Bing ◽  
Xiang Li ◽  
Alexander Haverkamp ◽  
Ian T. Baldwin ◽  
Bill S. Hansson ◽  
...  
Keyword(s):  
Manduca Sexta ◽  
Seed Set ◽  
Tobacco Plant ◽  
The Other ◽  
Floral Traits ◽  
Nicotiana Attenuata ◽  
Pollination Syndromes ◽  
Pollination Services ◽  
Flower Opening ◽  
Local Adaptations

Most flowering plants depend on animal pollination for successful sexual reproduction. Floral signals such as color, shape, and odor are crucial in establishing this (often mutualistic) interaction. Plant and pollinator phenotypes can vary temporally but also spatially, thus creating mosaic-like patterns of local adaptations. Here, we investigated natural variation in floral morphology, flower volatile emission, and phenology in four accessions of a self-compatible wild tobacco, Nicotiana attenuata, to assess how these traits match the sensory perception of a known pollinator, the hawkmoth Manduca sexta. These accessions differ in floral traits and also in their habitat altitudes. Based on habitat temperatures, the accession occurring at the highest altitude (California) is less likely to be visited by M. sexta, while the others (Arizona, Utah 1, and Utah 2) are known to receive M. sexta pollinations. The accessions varied significantly in flower morphologies, volatile emissions, flower opening, and phenology, traits likely important for M. sexta perception and floral handling. In wind tunnel assays, we assessed the seed set of emasculated flowers after M. sexta visitation and of natural selfed and hand-pollinated selfed flowers. After moth visitations, plants of two accessions (Arizona and Utah 2) produced more capsules than the other two, consistent with predictions that accessions co-occurring with M. sexta would benefit more from the pollination services of this moth. We quantified flower and capsule production in four accessions in a glasshouse assay without pollinators to assess the potential for self-pollination. The two Utah accessions set significantly more seeds after pollen supplementation compared with those of autonomous selfing flowers, suggesting a greater opportunistic benefit from efficient pollinators than the other two. Moreover, emasculated flowers of the accession with the most exposed stigma (Utah 2) produced the greatest seed set after M. sexta visitation. This study reveals intraspecific variation in pollination syndromes that illuminate the potential of a plant species to adapt to local pollinator communities, changing environments, and altered pollination networks.

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