Gene Dose Effects on Cane Thorn Density and Cotyledonary Gland Number in Tetraploid Blackberries1

Pavlis, Gary C.; Moore, James N.

doi:10.21273/jashs.106.6.761

Cited by 2 publications

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References 4 publications

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“…Thorn lessness in 'Merton Thornless' and its derivatives is conditioned by a single gene with the thornless condition expressed in the homo zygous recessive state (18). Pavlis and Moore (17) recently showed that the inheritance of thorns in 'Merton Thornless' derivatives is qualitative, but the density of thorns on thorny segregates is con trolled by several modifying genes. Thorn size, shape, and density vary widely among R ubus species (Fig.…”

Section: Thornlessnessmentioning

confidence: 99%

Blackberry Breeding

Moore

1984

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Blackberries are classified taxonomically in the genus Rubus, subgenus Eubatus, and consist of a highly variable and complex group of plants. Bailey (1) recognized over 350 species of blackberries, but the taxonomy of the subgenus is still in much confusion. Blackberries range from evergreen, subtropical types to deciduous clones that survive beyond the Arctic Circle. Most are indigenous to the northern hemisphere but some occur in the tropical mountain regions of the southern hemisphere. A naturally occurring ploidy range from diploid (2x = 2n = 14) to dodecaploid (12x = 2n = 84) exists (5). Homoploid blackberry species are mostly interfertile and biological systems encouraging outcrossing are common, thus native populations of blackberries in much of the world are highly hybrid (7). Consequently, it is difficult to assign cultivars to specific species, since progenitors of modern cultivars were selected from the wild.

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Section: Thornlessnessmentioning

confidence: 99%