This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...favorable material for a study of quantitative characters. 4. The different species furnish very favorable material for a study of sterility. Different crosses furnish Fi generations which differ from each other in sterility. The range extends from species crosses which give no viable seed and from completely sterile ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...favorable material for a study of quantitative characters. 4. The different species furnish very favorable material for a study of sterility. Different crosses furnish Fi generations which differ from each other in sterility. The range extends from species crosses which give no viable seed and from completely sterile Fi crosses, to entirely fertile ones. The Tabacum section is represented by numerous varieties of the species Nicotiana tabacum. These are natives of the New World. All commercial tobacco grown in the United States belongs to this species. The Rustica section includes all the yellow-flowering species and varieties. These are of commercial importance in some countries. In India for example, they are successfully grown commercially and for some purposes prove more desirable than the tabacum varieties (Howard, et al, 1910 b, c). Among these rustica forms are three groups; (a) one in which the pistil is longer than the stamen and therefore which must be artificiallypollinated by hand or crossed by the aid of insects; (6) an intermediate type; and (c) forms in which the stamens and pistil are so arranged that self-fertilization is the usual rule. The Petunioides section contains numerous varieties and species. Many of these are grown as ornamental flowering types. Parthenogenesis.--Parthenogenesis, meaning the production of viable seed without pollination, was shown by Goodspeed (1915) to occur in N. labacum, variety Cuba. Under normal conditions its occurrence is rare. Wellington (1913) did not find parthenogensis in a considerable series of experiments and with numerous treatments under greenhouse conditions. Several species as well as several commercial varieties of N. tabacum were used in this study. Howard (1913) states that parthenogenesis in N..
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SIGNED! Hardcover, Signed and inscribed by the author to U of Mn. Prof. Boss, pages clean and tight, boards have slight fraying at edges & faint dents, no dust jacket INV#J-43 G/no DJ.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
