Apple Breeding at Cornell: Genetic Studies of Fruit Quality, Scab Resistance and Plant Architecture

Brown, S.; Maloney, K.E.; Hemmat, Minou; Aldwinckle, Herb S.

doi:10.17660/actahortic.2004.663.124

Cited by 11 publications

(8 citation statements)

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“…In the WxC population, the seed parent 6‐837 ( co / co ) exhibits a weeping habit derived from the ornamental crab apple cultivar ‘Red Jade’. As shown by Brown et al. (2004), the combination of columnar growth habit and weeping ‘Red Jade’ produces an intermediate phenotype, which was also seen in this population.…”

Section: Resultssupporting

confidence: 69%

Fine mapping of Co, a gene controlling columnar growth habit located on apple (Malus×domestica Borkh.) linkage group 10

et al. 2012

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Tree architecture and shoot morphology are important factors in apple production systems. Because a columnar growth habit facilitates highdensity planting and labour-saving fruit production methods, columnar apple breeding programmes are spreading worldwide. Columnar growth habit is controlled by a single dominant gene, Co, on linkage group 10. Fine mapping of Co was conducted using 1000 F 1 progeny plants from 31 populations. Novel simple sequence-repeat (SSR) markers were developed based on the genome sequence of apple ÔGolden DeliciousÕ and analysed for linkage to Co. Graphical genotyping of 22 progeny with recombination event in the vicinity of Co identified three SSR markers (Mdo.chr10.12, Mdo.chr10.13 and Mdo.chr10.14) that co-segregated with Co. Mdo.chr10.12 and Mdo.chr10.14 are well suited for marker-assisted selection because the sizes of the alleles linked to Co are different from those found in common ancestors of current apple breeding germplasm. The Co region was delimited to a 196-kb region of the apple genome, between markers Mdo.chr10.11 and Mdo.chr10.15.

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Section: Resultssupporting

confidence: 69%

Fine mapping of Co, a gene controlling columnar growth habit located on apple (Malus×domestica Borkh.) linkage group 10

et al. 2012

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“…Since that time, weeping architectures in several tree species have been shown to segregate as single gene traits. A weeping phenotype in apple has been linked to a single dominant locus, while two distinct eastern redbud weeping phenotypes have been linked to recessive loci, and weeping phenotypes in chestnut have been linked to both recessive and dominant loci (18)(19)(20)(21)(22). Weeping in Japanese apricot (Prunus mume) was shown to be recessive and mapped to a region on linkage group 7 (23).…”

Section: Significancementioning

confidence: 99%

Loss of a highly conserved sterile alpha motif domain gene ( WEEP ) results in pendulous branch growth in peach trees

Hollender

Pascal

Tabb

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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Plant shoots typically grow upward in opposition to the pull of gravity. However, exceptions exist throughout the plant kingdom. Most conspicuous are trees with weeping or pendulous branches. While such trees have long been cultivated and appreciated for their ornamental value, the molecular basis behind the weeping habit is not known. Here, we characterized a weeping tree phenotype in (peach) and identified the underlying genetic mutation using a genomic sequencing approach. Weeping peach tree shoots exhibited a downward elliptical growth pattern and did not exhibit an upward bending in response to 90° reorientation. The causative allele was found to be an uncharacterized gene,, having a 1.8-Kb deletion spanning the 5' end. This gene, dubbed , was predominantly expressed in phloem tissues and encodes a highly conserved 129-amino acid protein containing a sterile alpha motif (SAM) domain. Silencing WEEP in the related tree species (plum) resulted in more outward, downward, and wandering shoot orientations compared to standard trees, supporting a role for WEEP in directing lateral shoot growth in trees. This previously unknown regulator of branch orientation, which may also be a regulator of gravity perception or response, provides insights into our understanding of how tree branches grow in opposition to gravity and could serve as a critical target for manipulating tree architecture for improved tree shape in agricultural and horticulture applications.

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“…In Malus , the weeping (pendulous) phenotype is found in M. domestica , such as cv ‘Elisa Ratkee’, but it is more frequently seen in crabapples for ornamental purpose, such as ‘Exzellenz Thiel’, ‘Red Jade’, M. baccata ‘Gracilis’, ‘Cheal’s Weeping’, and ‘Louisa’. ‘Red Jade’ is believed to be derived from an open pollinated seedlings of ‘Exzellenz Thiel’, which was selected from the cross M. prunifolia ‘Pendula’ × M. floribunda ( Brown et al , 2004 ). The weeping phenotype in M. baccata ‘Gracilis’ is controlled by a single dominant allele, called Weeping ( W ), based on an inheritance study conducted in two small populations of 28 seedlings derived from M. baccata ‘Gracilis’ ( Sampson and Cambron, 1965 ; Brown, 1992 ; Alston et al , 2000 ).…”

Section: Introductionmentioning

confidence: 99%

Exploring DNA variant segregation types in pooled genome sequencing enables effective mapping of weeping trait in Malus

Dougherty

Singh

Brown

et al. 2018

Journal of Experimental Botany

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Apple Breeding at Cornell: Genetic Studies of Fruit Quality, Scab Resistance and Plant Architecture

Cited by 11 publications

References 0 publications

Fine mapping of Co, a gene controlling columnar growth habit located on apple (Malus×domestica Borkh.) linkage group 10

Fine mapping of Co, a gene controlling columnar growth habit located on apple (Malus×domestica Borkh.) linkage group 10

Loss of a highly conserved sterile alpha motif domain gene ( WEEP ) results in pendulous branch growth in peach trees

Exploring DNA variant segregation types in pooled genome sequencing enables effective mapping of weeping trait in Malus

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