![]() In the development of this inbred, a genetic cross between the variety Green A green zebra type tomato was also developed in this program. Selection for horticultural type was made from field evaluations on the island of Maui and disease resistance selections were based upon marker assisted selection using molecular markers. Cross pollinations were then made with the F3 generation materials and plum-type parental lines derived by self-pollinating and selecting desirable F5 plants from two commercial F1 hybrids, Classica VFFNA hybrid and Spectrum hybrid. ![]() The resultant F1 hybrid was self-pollinated and progeny homozygous for both Sw-5 and Mi was selected after 2 self-pollinations. In the development of this inbred line, a plum-type breeding line with homozygous resistance to TSWV and the root knot nematode was generated by a cross between G8-5 and an inbred plum variety derived from a F1 commercial hybrid, Supra. Suitable for production in Hawaii was also developed in this program. A beefsteak-type F1 hybrid tomato suitable for commercial production in Hawaii was generated by crossing G8-5 and 3-4#5. Markers employed included 3 co-dominant SCAR markers, UBC421 for Sw-5, Rex-1 for Mi, and Tm2 for Tm2a. The other parent (3-4#5) was homozygous for Sw-5 and the ripening-inhibitor (rin) mutation that yield fruits that fail to ripen. Two donor beef steak type tomato parents, G8-5 was homozygous for Sw-5 that confers resistance to the tomato spotted wilt tospovirus (TSWV), Mi that confers resistance to the root knot nematode, and Tm2a that confers resistance to the tomato mosaic tobamovirus. A genetic backcrossing strategy was employed for the development of different horticultural tomato types. Progress 08/01/02 to 09/30/06 Outputs Marker assisted selection (MAS) was successfully employed to select the progeny from genetic crosses containing 3 disease resistance genes and to develop inbred tomato varieties that could be commercially grown in Hawaii. The parental lines used to produce desirable hybrids lines that are selected by growers for commercial production from the on farm trials will be transferred to the UH Manoa Campus Seed Lab for future seed production. Elite breeding lines will be used to produce different types of experimental hybrid tomatoes to be evaluated first in experimental plots then in cooperator grower field trials. Selected individuals will be evaluated in the field for desirable phenotype for further backcrosing or selfing to develop elite breeding lines. Molecular markers linked TSWV (Sw5 gene), Tomato Mosaic Virus (Tm2a gene), and root knot nematode (Mi gene) resistances will be used in marker assisted selection (MAS) of Different tomato types include plum, bunch type, cherry types, and a green zebra. A genetic backcrossing program to introgress multiple disease resistances into the different tomato types will be initiated. ![]() Seeds should be available during the first year of this project and will be distributed by the Cooperative Extension Service (CES) and evaluated for performance by both CES and research personnel. Five to eight Maui farmers will be selected for these trials. We propose to conduct on farm trials to evaluate the quality and yield of this new hybrid. A genetic cross between both parents has resulted in a fresh market beef-steak type tomato, Hybrid #5. Some tomato plants are easier to grow than others, so keep that in mind too.Project Methods Two parental lines have been developed that contain three disease resistance genes including resistance to the Tomato spotted wilt Tospovirus (TSWV). Those sure are some delicious varieties of tomatoes! Some of the best-tasting tomatoes make the list, including Brandywine, Black Krim, Sungold, San Marzano, and Cherokee Purple. Here are 50 of the most popular tomato varieties in North America: Big list of tomato varieties Top tomato varieties ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |