نتایج جستجو برای: nicotiana

تعداد نتایج: 6422  

2015
Elizabeth W. McCarthy Sarah E. J. Arnold Lars Chittka Steven C. Le Comber Robert Verity Steven Dodsworth Sandra Knapp Laura J. Kelly Mark W. Chase Ian T. Baldwin Aleš Kovařík Corinne Mhiri Lin Taylor Andrew R. Leitch

BACKGROUND AND AIMS Speciation in angiosperms can be accompanied by changes in floral colour that may influence pollinator preference and reproductive isolation. This study investigates whether changes in floral colour can accompany polyploid and homoploid hybridization, important processes in angiosperm evolution. METHODS Spectral reflectance of corolla tissue was examined for 60 Nicotiana (...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2004
Shu-Jun Yang Shelly A Carter Anthony B Cole Ning-Hui Cheng Richard S Nelson

Nicotiana benthamiana often displays more intense symptoms after infection by RNA viruses than do other Nicotiana species. Here, we examined the role of RNA-dependent RNA polymerases (RdRPs) in N. benthamiana antiviral defense. cDNAs representing only two genes encoding RdRPs were identified in N. benthamiana. One RdRP was similar in sequence to SDE1/SGS2 required for maintenance of transgene s...

Journal: :Molecular plant-microbe interactions : MPMI 2004
Anthony B Cole Lóránt Király Leslie C Lane B Elizabeth Wiggins Kathleen Ross James E Schoelz

A new variety of Nicotiana edwardsonii, designated N. edwardsonii cv. Columbia, expresses pathogenesis-related (PR) proteins in a temporal manner 45 to 49 days postplanting and also exhibits enhanced resistance to Tobacco mosaic virus, Tobacco necrosis virus, and Tomato bushy stunt virus. In contrast, PR proteins were not expressed in the original N. edwardsonii variety at comparable ages but w...

2013
Nicolas Sierro Jan van Oeveren Michiel J T van Eijk Florian Martin Keith E Stormo Manuel C Peitsch Nikolai V Ivanov

Genomics-based breeding of economically important crops such as banana, coffee, cotton, potato, tobacco and wheat is often hampered by genome size, polyploidy and high repeat content. We adapted sequence-based whole-genome profiling (WGP™) technology to obtain insight into the polyploidy of the model plant Nicotiana tabacum (tobacco). N. tabacum is assumed to originate from a hybridization even...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2003
Yonggen Lou Ian T Baldwin

Allopolyploid speciation occurs instantly when the genomes of different species combine to produce self-fertile offspring and has played a central role in the evolution of higher plants, but its consequences for adaptive responses are unknown. We compare herbivore-recognition and -resistance responses of the diploid species and putative ancestral parent Nicotiana attenuata with those of the two...

ژورنال: :مجله تازه های بیوتکنولوژی سلولی - مولکولی 0
مجید صفری ساعتلو majid safari saatloo islamic azad university of khoyعلوم و تکنولوژی بذر، دانشگاه آزاد اسلامی واحد خوی فاطمه نجات زاده fatemeh nejatzadeh faculty of agriculture, islamic azad university of khoyگروه باغبانی، دانشکده کشاورزی، دانشگاه آزاد اسلامی واحد خوی رامین تقوی تبت ramin taghavi tabat water, soil and agricultural, urmia tobacco research center, urmiaآب و خاک و زراعت مرکز تحقیقات توتون ارومیه

سابقه و هدف: به منظور بررسی تاثیر پرایمینگ بذر در خصوصیات جوانه زنی بذر توتون رقم بارلی 21 ، تحقیقی در دو بخش در آزمایشگاه مرکز تحقیقات توتون ارومیه درپاییز سال 1392 انجام یافت. مواد و روش ها: در بخش اول، طرح در قالب کرت کاملاً تصادفی با 26 تیمار و 3 تکرار انجام یافت که تیمارها عبارت از شاهد، مصرف غلظت 5/0، 1، 5/1 و 2 درصد پلی اتیلن گلیکول  به تفکیک در مدت زمان های 1، 2، 3، 5 و 10 روز، مصرف آب (...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1989
C Koncz N Martini R Mayerhofer Z Koncz-Kalman H Körber G P Redei J Schell

An insertion element [transferred DNA (T-DNA)], transferred by soil agrobacteria into the nuclear genome of plants, was used for induction of gene fusions in Arabidopsis thaliana, Nicotiana tabacum, and Nicotiana plumbaginifolia. A promoterless aph(3')II (aminoglycoside phosphotransferase II) reporter gene was linked to the right end of the T-DNA and transformed into plants along with a plasmid...

Journal: :Phytochemistry 2003
Robert A Raguso Rachel A Levin Susan E Foose Meredith W Holmberg Lucinda A McDade

GC-MS analyses of nocturnal and diurnal floral volatiles from nine tobacco species (Nicotiana; Solanaceae) resulted in the identification of 125 volatiles, including mono- and sesquiterpenoids, benzenoid and aliphatic alcohols, aldehydes and esters. Fragrance chemistry was species-specific during nocturnal emissions, whereas odors emitted diurnally were less distinct. All species emitted greate...

Journal: :Current Biology 1999
Jim Hope

plants are cloaked in hundreds of tiny projections, known as trichomes. These structures vary in function, shape, size and spacing from species to species, and it’s not known whether similar cellular differentiation programs are responsible for making trichomes in different plants. Trichomes are clearly visible in the scanning electron micrograph of a wild-type Nicotiana tabacum seedling above ...

2017
Nahid Moghbel BoMi Ryu Angela Ratsch Kathryn J. Steadman

A range of endemic Nicotiana species are chewed as a smokeless tobacco by several Aboriginal populations of Australia. In tobacco research, nicotine to nornicotine conversion is important because nornicotine lowers tobacco quality and is detrimental to health. A diverse group of cytochrome P450 genes with different transcriptional regulations are involved in this conversion. The primary aims of...

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