Origins of the Genus Nicotiana Research Paper by Rifkhan

Origins of the Genus Nicotiana
A review of an experiment on the origins of the genus Nicotiana, using intron size variation in QPT genes.
# 153751 | 2,424 words | 7 sources | APA | 2013 | SA
Published on Dec 06, 2013 in Biology (Biotechnology) , Biology (Botany)

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This paper reviews the hypothesis that two ancestral gene pools were crossed to create two modern morphological lineages in the Nicotiana species. The paper analyzes the monash artificial tobacco (MATF1) and Nicotiana suaveolens to determine if there has been a variation in intron size, and whether the parental DNA changed in size. The paper finds that this hypothesis was confirmed by this experiment, and, the MATF1 hybrid had the same intron size as its ancestral parents, suggesting that the DNA has not changed since the natural hybridization that occurred in South America years ago.

Materials and Methods
Results and Discussion

From the Paper:

"The genus Nicotiana, from the Solanaceae family, consists of 77 species, of which 40 are diploid and 37 allopolyploids. All these species have different chromosome numbers, ploidy levels and geographical origins. According to morphological and cytological evidence, the Nicotiana species first evolved in South America followed by consequent dispersals to other continents like Africa, southwestern North America, and mainland Australia. Certain species of Nicotiana are still used in traditional medicine in Australia and South America while the well-known Nicotiana tabacum (Tobacco) is one of the world's most commonly used commercial drug plant. Furthermore, the genus has also come under intense scientific research, which has brought to light, vital information regarding evolutionary relationships between the various species in this genus (Chase et al., 2003; Akhtar et al. 2011).
"Since Thomas Harper Goodspeed published a reliable classification chart for Nicotiana (Goodspeed, 1954), further taxonomic adjustments have not been carried out. Goodspeed discovered 60 species, and since then many new species from Australia, Africa and South America were found. His monograph was a broad analysis of morphological, cytological and crossing relationships. In restructuring the origins of the genus, Goodspeed hypothesized that two familial gene pools were merged to create two morphological lineages in present-day Nicotiana, however, he did not indicate that sister group relationships could achieve this."

Sample of Sources Used:

  • Akhtar S, Briddon RW, Mansoor S. 2011. Reactions of Nicotiana species to inoculation with monopartite and bipartite begomoviruses. Virology Journal. 8:475.
  • Chase MW, Knapp S, Cox AV, Clarkson JJ, Butsko Y, Joseph J, Savolaineni V, Parokonny AS. 2003. Molecular Systematics, GISH and the Origin of Hybrid Taxa in Nicotiana (Solanaceae). Annals of Botany. 92:107-127.
  • Goodspeed TH. 1954. The genus Nicotiana. Chronica Botanica 16:1-536.
  • Hughes SS, Buckley CO, Neafsey DE. 2008. Complex Selection on Intron Size in Cryptococcus neoformans. Molecular Biology and Evolution. 25: 247-253.
  • Monash University. 2012. BTH3820 Plant biotechnology laboratory manual. 37-42

Cite this Research Paper:

APA Format

Origins of the Genus Nicotiana (2013, December 06) Retrieved August 18, 2022, from

MLA Format

"Origins of the Genus Nicotiana" 06 December 2013. Web. 18 August. 2022. <>