However, the transition from primitive to 'advanced' cultivars has had the effect of narrowing the genetic base. This has happened in two distinct ways: (1) selection for relative uniformity, resulting in 'pure' lines, multi lines, single or double hybrids, etc. ; and (2) selection for closely defined objectives. Both of these processes have resulted in a marked reduction in genetic variation. At the same time, there has been a tendency to restrict the gene pool from which parental material has been drawn. This is a result of the high level of productivity achieved when breeding within a restricted but well-adapted gene pool, and of breeding methods which have made it possible to introduce specifically desired improvements, such as disease resistance and quality characteristics, into breeding stocks with a minimum of disturbance to genotypic structure. Developments in agriculture, such as intensive mechanization, the widespread application of fertilizers and the use of herbicides, fungicides and pesticides, have created a situation whereby a few, selected high yielding cultivars may be grown over large parts of the earth, so further contributing to a decline in crop genetic diversity. This process is under way in all countries, both developed and developing, and unfortunately in cludes some of the richest primary and secondary gene centres of several important food crops.
"synopsis" may belong to another edition of this title.
...recommended to all involved with plant genetic conservation and to postgraduate students of in vitro methods. - The Biologist
"About this title" may belong to another edition of this title.
Shipping:
£ 15
From United Kingdom to U.S.A.
Shipping:
FREE
Within U.S.A.
Seller: booksXpress, Bayonne, NJ, U.S.A.
Soft Cover. Condition: NEW. Seller Inventory # 9789401053624
Quantity: 10 available
Seller: GreatBookPrices, Columbia, MD, U.S.A.
Condition: New. Seller Inventory # 19197441-n
Quantity: 5 available
Seller: Lucky's Textbooks, Dallas, TX, U.S.A.
Condition: New. Seller Inventory # ABLIING23Apr0412070055304
Quantity: Over 20 available
Seller: AHA-BUCH GmbH, Einbeck, Germany
Taschenbuch. Condition: Neu. Druck auf Anfrage Neuware - Printed after ordering - However, the transition from primitive to 'advanced' cultivars has had the effect of narrowing the genetic base. This has happened in two distinct ways: (1) selection for relative uniformity, resulting in 'pure' lines, multi lines, single or double hybrids, etc. ; and (2) selection for closely defined objectives. Both of these processes have resulted in a marked reduction in genetic variation. At the same time, there has been a tendency to restrict the gene pool from which parental material has been drawn. This is a result of the high level of productivity achieved when breeding within a restricted but well-adapted gene pool, and of breeding methods which have made it possible to introduce specifically desired improvements, such as disease resistance and quality characteristics, into breeding stocks with a minimum of disturbance to genotypic structure. Developments in agriculture, such as intensive mechanization, the widespread application of fertilizers and the use of herbicides, fungicides and pesticides, have created a situation whereby a few, selected high yielding cultivars may be grown over large parts of the earth, so further contributing to a decline in crop genetic diversity. This process is under way in all countries, both developed and developing, and unfortunately in cludes some of the richest primary and secondary gene centres of several important food crops. Seller Inventory # 9789401053624
Quantity: 1 available
Seller: Ria Christie Collections, Uxbridge, United Kingdom
Condition: NEW. PRINT ON DEMAND Book; New; Fast Shipping from the UK. No. book. Seller Inventory # ria9789401053624_lsuk
Quantity: Over 20 available
Seller: GreatBookPricesUK, Castle Donington, DERBY, United Kingdom
Condition: New. Seller Inventory # 19197441-n
Quantity: 5 available
Seller: moluna, Greven, Germany
Condition: NEW. Seller Inventory # 5832055
Quantity: Over 20 available
Seller: Kennys Bookshop and Art Galleries Ltd., Galway, GY, Ireland
Condition: NEW. Editor(s): Dodds, J. H. Num Pages: 247 pages, biography. BIC Classification: PSAF; PST; WNP. Category: (P) Professional & Vocational. Dimension: 234 x 156 x 13. Weight in Grams: 403. . 2012. Softcover reprint of the original 1st ed. 1991. Paperback. . . . . Seller Inventory # V9789401053624
Quantity: 15 available
Seller: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Germany
Taschenbuch. Condition: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -However, the transition from primitive to 'advanced' cultivars has had the effect of narrowing the genetic base. This has happened in two distinct ways: (1) selection for relative uniformity, resulting in 'pure' lines, multi lines, single or double hybrids, etc. ; and (2) selection for closely defined objectives. Both of these processes have resulted in a marked reduction in genetic variation. At the same time, there has been a tendency to restrict the gene pool from which parental material has been drawn. This is a result of the high level of productivity achieved when breeding within a restricted but well-adapted gene pool, and of breeding methods which have made it possible to introduce specifically desired improvements, such as disease resistance and quality characteristics, into breeding stocks with a minimum of disturbance to genotypic structure. Developments in agriculture, such as intensive mechanization, the widespread application of fertilizers and the use of herbicides, fungicides and pesticides, have created a situation whereby a few, selected high yielding cultivars may be grown over large parts of the earth, so further contributing to a decline in crop genetic diversity. This process is under way in all countries, both developed and developing, and unfortunately in cludes some of the richest primary and secondary gene centres of several important food crops. 260 pp. Englisch. Seller Inventory # 9789401053624
Quantity: 2 available
Seller: GreatBookPricesUK, Castle Donington, DERBY, United Kingdom
Condition: As New. Unread book in perfect condition. Seller Inventory # 19197441
Quantity: 5 available