Articles
POTENTIAL CONTRIBUTIONS OF WIDE CROSSES TO IMPROVEMENT OF PROCESSING TOMATOES
Article number
200_3
Pages
45 – 56
Language
Abstract
The tomato is a classical example of the use of wide crosses for cultivar improvement.
Such crosses were largely stimulated by the relative lack of variation in cultivated types, particularly prior to 1940. Currently resistance to at least 30 diseases has been identified in wild sources, of which 16 have already been bred into commercially accepted cvs.
Other attributes, particularly such quality components as color, soluble solids, and other flavor elements have been similarly derived.
Resistances to pernicious arthropods and to various stresses (salinity, temperature extremes, deficiency and excess of water) have been identified and are being studied intensively.
Heretofore, germplasm in the 9 Lycopersicon spp. has been exploited, but a recent breakthrough — the generation of sesquidiploid hybrids with two genomes of L. esculentum and one of Solanum lycoperslcoides — may provide a new avenue for gene exchange.
Offspring from the sesquidiploids include alien addition aneuploids as well as diploid and aneuploid recombinants.
Such crosses were largely stimulated by the relative lack of variation in cultivated types, particularly prior to 1940. Currently resistance to at least 30 diseases has been identified in wild sources, of which 16 have already been bred into commercially accepted cvs.
Other attributes, particularly such quality components as color, soluble solids, and other flavor elements have been similarly derived.
Resistances to pernicious arthropods and to various stresses (salinity, temperature extremes, deficiency and excess of water) have been identified and are being studied intensively.
Heretofore, germplasm in the 9 Lycopersicon spp. has been exploited, but a recent breakthrough — the generation of sesquidiploid hybrids with two genomes of L. esculentum and one of Solanum lycoperslcoides — may provide a new avenue for gene exchange.
Offspring from the sesquidiploids include alien addition aneuploids as well as diploid and aneuploid recombinants.
Authors
C.M. Rick, J.W. DeVerna, R.T. Chetelat, M.A. Stevens
Keywords
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