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Abstract
All cultivars of arrowleaf clover (Trifolium vesiculosum Savi) exhibit symptoms of iron (Fe)‐deficiency chlorosis when grown on calcareous soils. Previous research has shown that arrowleaf clover is adapted to the climatic areas where calcareous soils do occur. Since arrowleaf clover is highly cross‐pollinated, cultivars are made up of heterogeneous populations of plants. When individual seedlings of ‘Yuchi’ arrowleaf clover were grown in the greenhouse in saturated calcareous soils, most seedling expressed severe chlorosis. Resistant (green) plants were retained and intermated through three cycles of recurrent selection for resistance to Fe‐deficiency chlorosis. The frequency of occurrence of resistant plants has been increased by this selection process. Cycle 3 seedlings averaged 44% resistant vs 17% for unselected Yuchi. Highly susceptible seedlings accounted for 16% and 48% of Cycle 3 and Yuchi arrowleaf clover, respectively.
Notes
Texas Agricultural Experiment Station Journal Series No. TA‐25782.
Associate Professor, Texas A&M Univ. Agric. Res. and Ext. Center, Overton TX. 75684
Farm Advisor, Univ. of California Cooperative Ext. Service, 207 W. South St, Bishop, CA. 93514