Tempranillo blanco region came to an agreement that would allow the planting and use of Tempranillo blanco in white Rioja wines produced under the DOC labels. Tempranillo blanco was one of three native white varieties added to permitted list of Rioja grapes--Maturana Blanca and Turruntes being the others. Additionally, Maturana Tinta, Maturano, Monastel, Chardonnay, Sauvignon blanc and Verdejo were added with Tempranillo blanco in the first major change of the Rioja wine laws involving grape varieties since the wine region was officially established in 1925. Under the DOC rules, in order to have new plantings of Tempranillo blanco vineyards must pull up
Petite mutation petite negative mutants. Potentially, these yeasts have a different inheritance system in place for their mitchondrial genome than "S. cerevisiae" does. The frequency at which "S. castellii" spontaneously produces petites is similar to that of "S. cerevisiae", with the mitochondrial DNA of those petites being highly altered via deletion and rearrangement. Suppressive petites of "S. cerevisiae" are the most commonly observed spontaneously created mutants, whereas in "S. castellii," the most commonly observed spontaneous mutant is the neutral petite, further leading to speculation that the transference of this mutation differs between species. Petite mutation petite (ρ–) is a mutant first discovered