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Evolutionary autoploidy in the sweet potato (Ipomoea batatas (L.) Lam.) and its progenitors
SummaryThe role of polyploidy in the evolution of the sweet potato. I. batatas (2n=6x=90), became more clear in 1971 when wild species with 30, 60, and 90 chromosomes were discovered. These species,Expand
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Causal Relationships between the Polar Nuclei in Double Fertilization and Interspecific Cross-incompatibility in Avena
A diallel cross was made using ten polyploid species, 2x, 4x, and 6x, x=7, in the genus Avena. Inmost crosses hybrid seeds were successfully obtained though the frequency of seed set varied greatly.Expand
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Critical Discussion on Abortive Interspecific Crosses in Brassica
In most interspecific hybridization among diploid Brassica species (n = 8, 9, 10), few or no hybrids are obtained, and the three crosses of tetraploid (n = 17, 18, 19) by diploid species are usuallyExpand
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THE EFFECTS OF KINETIN AND INDOLEACETIC ACID ON CALLUS GROWTH AND ORGAN FORMATION IN TWO SPECIES OF NICOTIANA
Growth and callus formation were observed using pith tissues of Nicotiana tabacum “Bright Yellow” (2n=48) and N. alata (2n=18) which were cultured on a basal medium or basal medium plus IAA, kinetin,Expand
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The genetics and cytology of certain cereals
1) The original fatuoids used in this work were supplied by Dr. C. L. HUSKINS, who had already studied them.2) Heterozygous fatuoids from three strains, H58, H20 and H93 segregated in the followingExpand
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MEIOTIC CHROMOSOME PAIRING IN TWO INTERSPECIFIC HYBRIDS AND A CRITICISM OF THE EVOLUTIONARY RELATIONSHIP OF DIPLOID AVENA
A new cross, A. strigosa×A. pilosa, was successfully made when A. pilosa was a pollen parent. The hybrid indicated 0-4 bivalents with an average 0.75 bivalents per cell.In A. pilosa×A. ventricosaExpand
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Triple fusion of the primary endosperm nucleus as a cause of interspecific cross-incompatibility in Avena
SummaryUsing five diploid, two tetraploid and three hexaploid Avena species (x=7) 78 reciprocal crosses were made. Of these 74 were successfull, though the frequency of seed set varied greatly. TheExpand
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