U.S.-New Zealand Cooperative Research: Breeding Improved Pasture Legumes from the Cross Trifolium ambiguum x T. repens

该奖项将使伊丽莎白博士之间的合作研究 G.肯塔基州大学的威廉姆斯和沃伦M. 草原分部的威廉姆斯和约翰·范登·博施， 科学和工业研究部位于 新西兰北帕默斯顿。 这些研究人员将生产 白色三叶草与库拉三叶草种间遗传杂种 为了构建高世代的育种群体， 与双亲杂交和回交。 白色三叶草，三叶草 是美国和新西兰的主要牧草豆类。 缤客 虽然这种三叶草能够承受 放牧，如果水分充足，从而提高质量， 草原的可消化能量和蛋白质， 就共生固氮而言，不幸的是， 在低湿度下缺乏持久性的限制 条件 库拉（高加索）三叶草，三叶草， 具有旺盛的地下多年生根和根茎系统 它不仅更耐旱， 不同的病毒影响白色三叶草。 肯塔基州大学的工作人员将把他们的活动集中在 通过种子胚拯救技术产生新的杂交种 它们沿着染色体加倍和组织 杂交材料的培养。 病毒检测研究也将 新西兰的调查人员将重点关注 他们在X射线照射以促进基因交换方面的工作， 开发更先进的一代杂交种， 新杂种的育性和农艺性状选择 材料. 美国和新西兰之间的合作 在北方和南半球工作的调查人员， 使实验性杂交三叶草的生长加倍， 每年的作物。

This award will enable collaborative research between Dr. Elizabeth G. Williams of the University of Kentucky and Dr. Warren M. Williams and John Vanden Bosch of the Grasslands Division, Department of Scientific and Industrial Research located at Palmerston North, New Zealand. These researchers will produce interspecific genetic hybrids between white clover and kura clover in order to construct breeding populations of advanced generation hybrids and backcrosses to both parents. White clover, Trifolium repens, is a major pasture legume in both the U.S. and New Zealand. While this clover has the ability to withstand heavy grazing if moisture is adequate, thus improving the quality of grasslands both with respect to digestible energy and protein, and in terms of symbiotic nitrogen fixation, unfortunately its use is limited by a lack of persistence under lowered moisture conditions. Kura (Caucasian) clover, Trifolium ambiguum, possessess a vigorous underground perennial root and rhizome system and is both more drought resistant and shows resistance to a number of different viruses which affect white clover. The University of Kentucky staff will focus their activity on the generation of new hybrids through a seed embryo rescue technique which they have developed along with chromosome doubling and tissue culturing of hybrid materials. Virus testing studies will also be conducted in the U.S. The New Zealand investigators will focus their work on X-irradiation to enhance genetic exchange, the development of further advanced generation hybrids, and the selection for fertility and agronomic performance of the new hybrid materials. The collaboration between the U.S. and New Zealand investigators, working in the Northern and Southern Hemispheres, enables a doubling in the growing of experimental hybrid clover crops each year.