What is a cultivar?by Looper R. Digital Marketing
A cultivar is a word used to differentiate genetic material with certain identifiable traits that can be copied or cloned by grafting to produce identical copies. Recommended Features
- Cultivars are predictable in performance.
- Cultivars should be placed in the orchard based on their predicable characteristics.
- Every tree you plant in the orchard, when planting specific cultivars, should perform the same way in the orchard.
- Regardless of their size or age, grafted cultivars are mature when planted and therefore initiate nut production in Michigan much sooner than seedlings.
- With a cultivar, you can talk about the traits of your trees; your likes and dislikes, and change out the cultivars to something that fits your needs.
Review on What is a cultivar?There are several methods to attach scion wood to rootstocks and some methods may work better than others for different tree species or under different conditions. For example, budding is a type of grafting where just the bud from the chosen tree is placed within the bark of the rootstock. The scion in this case would be the bud. Chestnuts are commonly grafted with scion wood or with buds, but in either case, the scion will produce trees identical to each other. Once the scions bud has sprouted and produced substantial growth, the rootstock above the point of scion attachment will be removed so the scion becomes the only growing material above the point of scion attachment.
If you are following the ideas presented so far, then you will realize that planting seed will produce the rootstock to which the scion is attached and therefore, one rootstock will be genetically distinct from any other rootstock. Therefore, even if the scion is the same throughout the orchard, the rootstock will be genetically distinct from tree to tree. This is one reason why trees planted in an orchard will still show some variability. The genetic diversity of the rootstock can be ignored in most situations, but there have been several cases where rootstock variation has lead to problems as minimal as bark discoloration or as serious as graft union failure and early tree death. In plant systems that have been studied for several decades, the knowledge of rootstock and scion wood combinations can lead to important orchard management opportunities such as rootstock that can lead to the preferential dwarfing of scion growth or resistance to soil-borne root diseases.
We are far away from that level of genetic management in rootstock development of chestnut, but we do believe that fewer problems will develop when the rootstock and scion wood are genetically related. If this theory holds true, then Chinese chestnut cultivars should not be grafted to European/Japanese seedlings or American chestnut
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Created on Jan 25th 2018 00:59. Viewed 132 times.
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