A process for producing a reduced tobacco-specific nitrosamine (TSNA) tobacco plant comprising reducing and/or eliminating anatabine biosynthesis in wild-type tobacco plant. In addition, use of such plants for discovery of molecular markers that are closely linked with genes required for anatabine biosynthesis and for discovery of genes required for anatabine biosynthesis. In addition, a smoking composition, a smoking article and a smokeless tobacco oral delivery product contain the tobacco material.

The present disclosure provides compositions and methods related to tobacco plants with altered total alkaloid and nicotine levels and commercially acceptable leaf grade, their development via breeding or transgenic approaches, and production of tobacco products from these tobacco plants.

Compositions and methods for reducing the level of nornicotine and N-nitrosonornicotine (NNN) in Nicotiana plants and plant parts thereof are provided. The compositions comprise isolated polynucleotides and polypeptides for cytochrome P450s that are involved in the metabolic conversion of nicotine to nornicotine in these plants. Expression cassettes, vectors, plants, and plant parts thereof comprising inhibitory sequences that target expression or function of the disclosed cytochrome P450 polypeptides are also provided. Methods for the use of these novel sequences to inhibit expression or function of cytochrome P450 polypeptides involved in this metabolic conversion are also provided. The methods find use in the production of tobacco products that have reduced levels of nornicotine and its carcinogenic metabolite, NNN, and thus reduced carcinogenic potential for individuals consuming these tobacco products or exposed to secondary smoke derived from these products.

Provided are (i) a tobacco plant which is suitable for cultivation for harvesting leaf tobaccos, (ii) a method of obtaining the tobacco plant, (iii) a harvest from the tobacco plant, and (iv) a processed product of the harvest. The present invention encompasses (i) a tobacco plant into which a mutation for suppressing the development of primary axillary buds is introduced, (ii) a method of obtaining the tobacco plant, (iii) a harvest from the tobacco plant, and (iv) a processed product of the harvest.

Provided is a tobacco plant which is suitable for cultivation for harvesting leaf tobaccos. The present invention encompasses (i) a tobacco plant into which a mutation for suppressing the development of primary axillary buds is introduced, (ii) a method of obtaining the tobacco plant, (iii) a harvest from the tobacco plant, and (iv) a processed product of the harvest.

Provided are a tobacco plant in which a high solavetivone content can be achieved without inoculation with a virus, and a method for producing the tobacco plant. In a tobacco plant in accordance with an aspect of the present invention, a function of an endogenous CA1 gene is suppressed.

There is described herein a mutant plant or part thereof having at least partially reduced expression or activity of at least two heavy metal ATPases (HMAs), said two HMAs comprising, consisting or consisting essentially of: (i) polypeptides having at least 65% sequence identity to SEQ ID NO:1 and SEQ ID NO:2; (ii) polynucleotides encoding the polypeptides set forth in (i); or (iii) polynucleotides having at least 65% sequence identity to SEQ ID NO:3 and SEQ ID NO:4 encoding HMAs; wherein the expression or activity of one of the HMAs set forth in (i) or (ii) or (iii) is partially reduced or lost and the expression or activity of one of the HMAs set forth in (i) or (ii) or (iii) is lost as compared to a control plant; and wherein the mutant plant or part thereof exhibits at least a 27% reduction, as compared to the control plant, in the accumulation of cadmium in leaf when the mutant plant is grown in the field in the presence of naturally or non-naturally occurring cadmium.

The present disclosure provides metabolic signatures and genetic markers for tracking enhanced nitrogen utilization efficiency phenotypes in tobacco plants and for introgressing enhanced nitrogen utilization efficiency phenotypes into tobacco plants. The disclosure also provides tobacco plants comprising enhanced nitrogen utilization efficiency and methods to the creation of tobacco plants comprising enhanced nitrogen utilization efficiency. The disclosure also provides recombinant polynucleotides and polypeptides for enhancing nitrogen utilization efficiency in modified tobacco plants and tobacco plants comprising the provided recombinant polynucleotides and polypeptides.

Compositions and methods for reducing the level of nornicotine and N-nitrosonornicotine (NNN) in Nicotiana plants and plant parts thereof are provided. The compositions comprise isolated polynucleotides and polypeptides for cytochrome P450s that are involved in the metabolic conversion of nicotine to nornicotine in these plants. Expression cassettes, vectors, plants, and plant parts thereof comprising inhibitory sequences that target expression or function of the disclosed cytochrome P450 polypeptides are also provided. Methods for the use of these novel sequences to inhibit expression or function of cytochrome P450 polypeptides involved in this metabolic conversion are also provided. The methods find use in the production of tobacco products that have reduced levels of nornicotine and its carcinogenic metabolite, NNN, and thus reduced carcinogenic potential for individuals consuming these tobacco products or exposed to secondary smoke derived from these products.

The present disclosure relates to tobacco plants, tobacco seeds, compositions, and methods related to the identification and introgression of the Pale Yellow locus in tobacco. It also relates to generating novel mutations within the PY locus in tobacco.