Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Preliminary Descriptions of Five New Genes in Peach

Author
item Okie, William

Submitted to: Plant Germplasm International Symposium Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: May 12, 1997
Publication Date: N/A

Technical Abstract: The roughskin character, which appeared in 3 seedlings from the cross Pekin x Durbin causes loss of all long hairs on the epidermis of the fruit, so the surface is dull and rough, unlike a shiny nectarine. Dormant leaf and flower buds are glabrous also, unlike those of normal peaches and nectarines. The character is controlled by a single recessive gene. An F2 seedling from the cross Shidaremomo op x Peppermint shows an exaggerated collar at the point of branch attachment to the trunk. On young trees this results in what appear to be knobs on the trunk. A normal-looking selection from the cross Roseprincess op x White English has produced seedlings in a 3:1 ratio of normal trees to a mini-pillar type, with short internodes and upright growth. Trees with this growth type so far have been completely unproductive although they do flower. An F2 seedling of LaPremiere x Stoneyhard has unique branching pattern in which the phyllotaxy periodically changes so that twigs emerge in a single plane. This fan-like growth is terminal; later a normal shoot breaks from below the affected area. F2 seedlings of this type crossed with normal give close to 3 normal:1 twisted seedlings, although the growth habit is indistinct during the first season. Seedlings from the homozygous red-leaf rootstock Flordaguard lose their red leaf color at very different rates, suggesting Flordaguard is heterozygous for at least one additional gene governing rate of leaf color fade. In 1/4 of the seedlings, red leaves fade quickly to green but with a red vein.

Last Modified: 10/24/2014