How To Grow Tobacco At Home
With the exception of Australia (which has its own indigenous Nicotiana that was chewed by Aborigines), the world ultimately owes its supplies of tobacco to the Americas. The cultural history of tobacco use begins in the remote prehistory of South America. According to current understanding, the lowlands of Patagonia, the Pampas, and Gran Chaco are the probable home of the tobacco plant. The early history of tobacco in South America is obscure, as few, if any, definite archaeological finds have been made. However, it is likely that the indigenous inhabitants of the region began to cultivate tobacco in their gardens several thousand years ago, growing about 12 different species altogether, Nicotiana tabacum and N. rustica being the most common. N. rustica had been taken by 200 ad to North America, where wild tobaccos had been harvested since at least 400 bc N. tabacum probably followed ca. 1000 ad.
Since plant membranes are very sensitive to all kind of stresses, the increase in levels of unsaturated membrane lipids, which increase membrane fluidity, may increase plant chilling tolerance and, as a consequence, photosynthetic activity. This is confirmed in cyanobacteria in which the level of unsaturation of fatty acids in membrane lipids was directly proportional to the chilling tolerance and to photosynthesis (Gombos et al. 1992). Transgenic tobacco plants demonstrated greater chill tolerance than wild-type tobacco if acyl-ACP-glycerol-3-phosphate
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