ISSN:
1573-5060
Keywords:
Avena sativa
;
oats
;
cytogenetics
;
Puccinia coronata f. avenae
;
leaf rust
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary True-breeding, leaf rust (Puccinia coronata Cda. f. sp. avenae Fraser and Led.) resistant oat lines with somatic chromosome numbers of 42 and 44, were recovered in the advanced generations of a pentaploid hybrid from the cross between C.I. 7232, a leaf rust resistant and dark lemma colored derived tetraploid and ‘Clarion’, a susceptible hexaploid oat. Microsporocyte observations and breeding behaviour of these lines and their F1 hybrids with susceptible hexaploid oat cultivars indicated that the 42- and 44-chromosome lines are disomic substitutions (20″+1″A) and disomic additions (21″+1″A), respectively, of the same alien chromosome which carries genes for dark colored lemma and leaf rust resistance. The substitution and addition lines possess good field resistance to leaf rust. Plants of substitution lines were less vigorous, shorter, with poor straw and reduced fertility. Addition lines had reduced tillering ability, plant vigour, culm thickness, leaf width and fertility and were late maturing. Progeny tests for resistance indicated that substitution lines are more stable than addition lines. It is suggested that these lines may be of value in a program of radiation-induced gene transfer.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00043185
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