TY - JOUR
T1 - Characterization of the missing diploid progenitors of the common oat
AU - Ladizinsky, G.
PY - 1995/3
Y1 - 1995/3
N2 - The genomic formula ACD of the hexaploid oat, Avena saliva, AC for the tetraploid species A. magna and A. murphyi, and the hypothesis that the A genome was contributed by A. strigosa group and C genome by A. ventricosa-A. eriantha group, have derived from karyotype studies. Cytogenetic evidence, however, does not support any of the known diploid oats as possible progenitors of the hexaploid oats. A. magna, and to a lesser extent, A. murphyi, are closer to the hexaploids than other tetraploids. Morphologically, these tetraploids resemble the sterilis type, which is apparently the genuine form of the hexaploid oats, with a few important differences. Spikelet morphology of these three wild oats indicates some features that must also occur in one or more of their diploid progenitors: 1. Ventricose diaspore containing the entire spikelet, 2. Long and broad callus with blunt tip, 3. Awn insertion at the lower one quarter of the lemma, 4. Close proximity of lemma tips of the two lower florets. A. magna and A. murphyi have narrow ecological ranges and are restricted to heavy alluvial soils which are now mostly under cultivation. It is likely that on similar soil type the diploid progenitors would grow as well and a search for them should be attempted there. Morocco is the most promising area for finding the missing diploids. Not only A. magna and A. murphyi grow there, but except one, all other annual oat species as well.
AB - The genomic formula ACD of the hexaploid oat, Avena saliva, AC for the tetraploid species A. magna and A. murphyi, and the hypothesis that the A genome was contributed by A. strigosa group and C genome by A. ventricosa-A. eriantha group, have derived from karyotype studies. Cytogenetic evidence, however, does not support any of the known diploid oats as possible progenitors of the hexaploid oats. A. magna, and to a lesser extent, A. murphyi, are closer to the hexaploids than other tetraploids. Morphologically, these tetraploids resemble the sterilis type, which is apparently the genuine form of the hexaploid oats, with a few important differences. Spikelet morphology of these three wild oats indicates some features that must also occur in one or more of their diploid progenitors: 1. Ventricose diaspore containing the entire spikelet, 2. Long and broad callus with blunt tip, 3. Awn insertion at the lower one quarter of the lemma, 4. Close proximity of lemma tips of the two lower florets. A. magna and A. murphyi have narrow ecological ranges and are restricted to heavy alluvial soils which are now mostly under cultivation. It is likely that on similar soil type the diploid progenitors would grow as well and a search for them should be attempted there. Morocco is the most promising area for finding the missing diploids. Not only A. magna and A. murphyi grow there, but except one, all other annual oat species as well.
KW - A. magna
KW - A. murphyi
KW - Avena sativa
KW - genome designation
KW - morphology
KW - Oat
KW - origin
UR - http://www.scopus.com/inward/record.url?scp=0029110241&partnerID=8YFLogxK
U2 - 10.1007/BF02310683
DO - 10.1007/BF02310683
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AN - SCOPUS:0029110241
SN - 0925-9864
VL - 42
SP - 49
EP - 55
JO - Genetic Resources and Crop Evolution
JF - Genetic Resources and Crop Evolution
IS - 1
ER -