Tobacco cultivars

Stomatal closure was associated with a genetic factor in onion wherein the stomata of sensitive plants did not close. The effect of ozone and PAN on stomatal opening depends on many interacting factors those representing water stress appear to be the most important. Dean related stomatal density to the difference in sensitivity between two tobacco cultivars. Evans and Ting found that maximal sensitivity of bean primary leaves was not associated with changes in stomatal number or leaf resistance. Ozone exposure caused a decrease in relative water content, but no change in resistance. Bean leaf sensitivity seemed more a function of internal activities. 

Tobacco, cultivar White Gold Tobacco, cultivar Bel W, Tobacco, cultivar Bel W,... 

Tobacco, cultivar >0.05 (Often over growing season) 22, top fresh wt 17 172... 

Menser and Heggestad first reported that exposure to mixtures of sulfur dioxide (0.50 ppm) and ozone (0.03 ppm) for 2 or 4 h caused 23-48% foliar injury to the sensitive tobacco cultivar Bel W, whereas the... 

Ozone and sulfur dioxide mixtures are of special interest, because of their widespread occurrence and the greater than additive effect on Bel W, tobacco. Concentrations of either or both that may cause foliar injury are found around major metropolitan areas throughout the world and are widespread throughout rural eastern United States. Macdowall and Cole reported that the two-gas combination lowered the threshold for injury of tobacco (cultivar White Gold) by sulfur dioxide, but not the threshold for ozone injury. Macdowall et defined the threshold in terms of dose when th reported the threshold at 20 pphm-h (0.20 ppm-h). This has not appeared true in several other reports, nor within the results reported by Macdowall and Cole. Symptoms reported, when sulfur dioxide was below the threshold for the specific plant, were similar to those reported for ozone. 

Tobacco, cultivar White C3old Oxidant Phygon XL (variable) Antioxidant 89 510... 

Menser, H. A., Jr. Effects of air pollution on tobacco cultivars grown in several states. Tobacco Sci. 13 99-104, 1969. 

Tobacco cultivar NC 89. Epibrassinolide was sprayed on the plant 20,35 and 50 days after transplant... 

Figure 3. Assays of tobacco transformed with a mutant tobacco ALS gene. Enzyme activity in the presence of herbicide was measured in leaves of commercial tobacco cultivars transformed with the HRA gene (plants 7-54), and in untransformed plants (WT2, WT4). Activity is expressed as a percentage of the activity measured in the absence of herbicide.

Ovinoaitional properties of DVT diols and DVT ols. In 1978, it was proposed that a tobacco cultivar. Tobacco Introduction (TI) 1112, was resistant to tobacco budworm because it lacked certain trichome exudates (MO Also, there were fewer budworm eggs on TI 1112 leaves compared to egg masses found on two other flue-cured cultivars. Four years later, Johnson and Chaplin (17) reported that trichome secretions influenced budworm moth oviposit ion in certain cultivars and, furthermore, resistant cultivars were capable of producing antibiotic substances that affected first instar larvae. Later, the leaf surface chemistry of TI 1112 was studied in detail and compared with that of budworm susceptible NC 2326 (18). The cuticular substances of NC 2326 were composed of high levels ofeCand/3-DVT diols, a series of C25 to C30 saturated... 

Figure 3. Concentration effect of Cand S DVT diols on deposition of eggs by Heliothis virescena on tobacco leaves in cage trials. Each dot represents a different tobacco cultivar. DVT levels are cultivar dependent.

Suspension cell cultures have been derived from a number of different plant species, including the widely-used laboratory model Arabidopsis thaliana [15], plants such as Catharanthus roseus and Taxus cus-pidata which are used to produce valuable secondary metaboHtes [16, 17], and important domestic crops such as tobacco, rice, alfalfa, tomato, and soybean [18-22]. Because cell lines from domestic crop species are well-characterized, they have been the most frequently used for recombinant protein production. The most popular cell hnes include those derived from the tobacco cultivars Bright Yellow 2 (BY-2) (Fig. 9.1) and Nicotiana tabacum 1 (NT-1) [2]. 

Chaplin, J.G. and H.W. Spurr Jr Quantification of tar and nicotine from selected tobacco cultivars (topped and not topped) when flue-cured 29th Tobacco Chemists ... 

WiUiamson, R.E. and J.F. Chaphn Levels of chemical constituents in cured leaves of four hurley tobacco cultivars 4273. 

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