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 3 publications

(1 citation statement)

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

horts

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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%

Blackberry Breeding

Moore

1984

horts

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Blackberry Breeding

Hall¹

1990

Plant Breeding Reviews

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Genetic Control of Prickles in Tetraploid Blackberry

Johns,

Silva,

Chizk

et al. 2024

Preprint

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Prickle-free blackberry (Rubus subgenus Rubus) canes are strongly preferred by growers due to food and worker safety concerns and damage to fruit from mechanical injury by prickles. This project was conducted to identify the genetic region responsible for prickle-free canes derived from the recessive 'Merton Thornless' source in autotetraploid blackberry using a genome-wide association study, develop diagnostic KASP markers for prickle-free canes, and determine the effects of allele dosage at the prickle-free locus on prickle density in two biparental populations. The prickle locus was located on chromosome Ra04 from 30.48 to 36.04 Mb in an extensive LD block, with the peak SNP located at 33.64 Mb. Two diagnostic KASP markers were developed that correctly predicted the phenotype of 97% and 96% of 626 diverse fresh-market blackberry genotypes from multiple breeding programs, respectively. Allele dosage at the prickle-free locus had a significant impact on prickle density, with duplex prickly genotypes having significantly higher prickle density than simplex genotypes in both biparental populations studied. Five potential candidate genes with functional annotations related to epidermal, trichome, and/or prickle development were identified within the prickle-free locus, but no nonsynonymous polymorphism within these genes were identified.

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

Cited by 3 publications

References 4 publications

Blackberry Breeding

Blackberry Breeding

Blackberry Breeding

Genetic Control of Prickles in Tetraploid Blackberry

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