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Two quantitative trait loci, Dw1 and Dw2, are primarily responsible for rootstock-induced dwarfing in apple.

Foster TM, Celton JM, Chagné D, Tustin DS, Gardiner SE - Hortic Res (2015)

Bottom Line: The apple dwarfing rootstock 'Malling9' ('M9') has been used worldwide both to reduce scion vigour and as a genetic source for breeding new rootstocks.A smaller-effect QTL affecting dwarfing (Dw2) was identified on LG11, and four minor-effect QTLs were found on LG6, LG9, LG10 and LG12.Phenotypic analysis indicates that the combination of Dw1 and Dw2 has the strongest influence on rootstock-induced dwarfing, and that Dw1 has a stronger effect than Dw2.

View Article: PubMed Central - PubMed

Affiliation: The New Zealand Institute for Plant & Food Research Ltd , Palmerston North Private Bag 11600, Palmerston North 4474, New Zealand.

ABSTRACT
The apple dwarfing rootstock 'Malling9' ('M9') has been used worldwide both to reduce scion vigour and as a genetic source for breeding new rootstocks. Progeny of 'M9' segregate for rootstock-induced dwarfing of the scion, indicating that this trait is controlled by one or more genetic factors. A quantitative trait locus (QTL) analysis of a rootstock population derived from the cross between 'M9' × 'Robusta5' (non-dwarfing) and grafted with 'Braeburn' scions identified a major QTL (Dw1) on linkage group (LG) 5, which exhibits a significant influence on dwarfing of the scion. A smaller-effect QTL affecting dwarfing (Dw2) was identified on LG11, and four minor-effect QTLs were found on LG6, LG9, LG10 and LG12. Phenotypic analysis indicates that the combination of Dw1 and Dw2 has the strongest influence on rootstock-induced dwarfing, and that Dw1 has a stronger effect than Dw2. Genetic markers linked to Dw1 and Dw2 were screened over 41 rootstock accessions that confer a range of effects on scion growth. The majority of the dwarfing and semi-dwarfing rootstock accessions screened carried marker alleles linked to Dw1 and Dw2. This suggests that most apple dwarfing rootstocks have been derived from the same genetic source.

No MeSH data available.


Number of trees in each flowering class and composition of classes by Dw1 and Dw2 genotype. Flowering was assessed by estimating the total number of flower clusters on each tree in the spring of year 2, and placing them into quartiles relative to the most highly floral trees, i.e., 1%–25%, 26%–50%, 51%–75% and 76%–100%. Trees with no flowers were also recorded. Data are from 109 trees from the first population, replicate 1.
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fig3: Number of trees in each flowering class and composition of classes by Dw1 and Dw2 genotype. Flowering was assessed by estimating the total number of flower clusters on each tree in the spring of year 2, and placing them into quartiles relative to the most highly floral trees, i.e., 1%–25%, 26%–50%, 51%–75% and 76%–100%. Trees with no flowers were also recorded. Data are from 109 trees from the first population, replicate 1.

Mentions: Early flowering was assessed in the spring of year 2 by estimating the number of floral clusters on 109 trees from the first population. The majority of the trees with the highest degree of flowering had been grafted onto rootstocks carrying both Dw1 and Dw2 (50%), or Dw1 alone (41.7%) (Figure 3). Conversely, the trees with no flowers or the fewest flowers were predominantly grafted onto rootstocks carrying Dw2 alone (33.9%), or neither dwarfing locus (44.6%).


Two quantitative trait loci, Dw1 and Dw2, are primarily responsible for rootstock-induced dwarfing in apple.

Foster TM, Celton JM, Chagné D, Tustin DS, Gardiner SE - Hortic Res (2015)

Number of trees in each flowering class and composition of classes by Dw1 and Dw2 genotype. Flowering was assessed by estimating the total number of flower clusters on each tree in the spring of year 2, and placing them into quartiles relative to the most highly floral trees, i.e., 1%–25%, 26%–50%, 51%–75% and 76%–100%. Trees with no flowers were also recorded. Data are from 109 trees from the first population, replicate 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4595989&req=5

fig3: Number of trees in each flowering class and composition of classes by Dw1 and Dw2 genotype. Flowering was assessed by estimating the total number of flower clusters on each tree in the spring of year 2, and placing them into quartiles relative to the most highly floral trees, i.e., 1%–25%, 26%–50%, 51%–75% and 76%–100%. Trees with no flowers were also recorded. Data are from 109 trees from the first population, replicate 1.
Mentions: Early flowering was assessed in the spring of year 2 by estimating the number of floral clusters on 109 trees from the first population. The majority of the trees with the highest degree of flowering had been grafted onto rootstocks carrying both Dw1 and Dw2 (50%), or Dw1 alone (41.7%) (Figure 3). Conversely, the trees with no flowers or the fewest flowers were predominantly grafted onto rootstocks carrying Dw2 alone (33.9%), or neither dwarfing locus (44.6%).

Bottom Line: The apple dwarfing rootstock 'Malling9' ('M9') has been used worldwide both to reduce scion vigour and as a genetic source for breeding new rootstocks.A smaller-effect QTL affecting dwarfing (Dw2) was identified on LG11, and four minor-effect QTLs were found on LG6, LG9, LG10 and LG12.Phenotypic analysis indicates that the combination of Dw1 and Dw2 has the strongest influence on rootstock-induced dwarfing, and that Dw1 has a stronger effect than Dw2.

View Article: PubMed Central - PubMed

Affiliation: The New Zealand Institute for Plant & Food Research Ltd , Palmerston North Private Bag 11600, Palmerston North 4474, New Zealand.

ABSTRACT
The apple dwarfing rootstock 'Malling9' ('M9') has been used worldwide both to reduce scion vigour and as a genetic source for breeding new rootstocks. Progeny of 'M9' segregate for rootstock-induced dwarfing of the scion, indicating that this trait is controlled by one or more genetic factors. A quantitative trait locus (QTL) analysis of a rootstock population derived from the cross between 'M9' × 'Robusta5' (non-dwarfing) and grafted with 'Braeburn' scions identified a major QTL (Dw1) on linkage group (LG) 5, which exhibits a significant influence on dwarfing of the scion. A smaller-effect QTL affecting dwarfing (Dw2) was identified on LG11, and four minor-effect QTLs were found on LG6, LG9, LG10 and LG12. Phenotypic analysis indicates that the combination of Dw1 and Dw2 has the strongest influence on rootstock-induced dwarfing, and that Dw1 has a stronger effect than Dw2. Genetic markers linked to Dw1 and Dw2 were screened over 41 rootstock accessions that confer a range of effects on scion growth. The majority of the dwarfing and semi-dwarfing rootstock accessions screened carried marker alleles linked to Dw1 and Dw2. This suggests that most apple dwarfing rootstocks have been derived from the same genetic source.

No MeSH data available.