Somaclonal Variation in Crop Improvement I (Hardcover, 1990 ed.)

Genetic erosions in plant cell cultures, especially in chromosome number and ploidy level, have now been known for over 25 years. Until the mid -1970ssuch changes were consideredundesirable and thereforediscarded because the main emphasis wason clonal propagation and genetic stability of cultures. However, since the publication on somaclonal variation by Larkin and Scowcroft (1981) there has been a renewed interest to utilize these in vitro obtained variations for crop improvement. Studies conduc- ted during the last decade have shown that callus cultures, especially on peridical subculturing over an extended period of time, undergo morpho- logical and genetic changes, i. e. polyploidy, aneuploidy, chromosome breakage, deletions, translocations, gene amplification, inversions, muta- tions, etc. In addition, there are changes at the molecular and biochemical levelsincluding changes in the DNA, enzymes,proteins, etc. Suchchanges are now intentionally induced, and useful variants are selected. For instance in agricultural crops such as potato, tomato, tobacco, maize, rice and sugarcane, plants showing tolerance to a number of diseases, viruses, herbicides and salinity, have been isolated in cell cultures. Likewise induction of male sterility in rice, and wheat showing various levels of fer- tility and gliadin, have been developed in vitro. These academic excercises open new avenues for plant breeders and pathologists. Another area of tremendous commercial importance in the pharmaceuti- cal industry is the selection of cell lines showing high levels of medicinal and industrial compounds. Already high shikonin containing somaclones in Lithospermum are being used commercially.

General

Imprint:	Springer-Verlag
Country of origin:	Germany
Series:	Biotechnology in Agriculture and Forestry, 11
Release date:	October 1990
First published:	1990
Authors:	Professor Dr y. P. S. Bajaj
Dimensions:	241 x 165 x 38mm (L x W x T)
Format:	Hardcover
Pages:	685
Edition:	1990 ed.
ISBN-13:	978-3-540-50785-7
Categories:	Books > Professional & Technical > Agriculture & farming > Crop husbandry > General Books > Science & Mathematics > Biology, life sciences > Life sciences: general issues > Genetics (non-medical) > General Books > Science & Mathematics > Biology, life sciences > Botany & plant sciences > Plant physiology > General Promotions
LSN:	3-540-50785-X
Barcode:	9783540507857

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