| Bulletin Volume 255-259 Contributor(s): U S Government (Author), Industry, United States Bureau (Author) |
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ISBN: 1234041235 ISBN-13: 9781234041236 Publisher: Rarebooksclub.com OUR PRICE: $32.91 Product Type: Paperback Published: May 2014 * Not available - Not in print at this time * |
| Additional Information |
| Physical Information: 0.28" H x 7.44" W x 9.69" (0.54 lbs) 130 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...fertility. The primitive, wild, or unselected stocks from which our highly selected varieties have been derived ought not to be disregarded or allowed to become extinct on the supposition that they have no further agricultural value. Such stocks may be required at any time in the future as sources of new strains. It is also important for purposes of practical breeding to take into account the facts of heredity in natural species, in order to learn the best methods of maintaining the uniformity of select strains and of preserving vigor and fertility. Some characters have mutual relations of expression and produce more congruous and more stable combinations. Other characters show distinct incompatibility of expression, resulting in weak or infertile plants. Comparison of variations in select strains with variations in unselected stocks and wild species of cotton shows that parallel series of variations run through the whole group. Correlations of variations in selected stocks and coherence of parental characters in hybrids seem to follow the same general lines in all the species and varieties of cotton that have been studied from this point of view. Many of the abnormalities that arise in hybrids and in mutative variations of select strains represent a failure of normal specialization among the parts of the plant, as in the shortened fruiting branches and leaflike involucral bracts of the so-called "cluster" cottons. Such abnormalities are usually accompanied by a tendency to sterility or abortion of buds and bolls and on this account are to be avoided in the breeding of new varieties. Characters of no practical value in themselves may be worthy of careful study as indications of changes of expression of other characters, as in... |