CHANGES IN THE REPRODUCTION OF HETERODERA-GLYCINES ON DIFFERENT LINES OF GLYCINE-MAX

  • 1 January 1984
    • journal article
    • research article
    • Vol. 16  (3) , 304-309
Abstract
Selection for ability of soybean cyst nematode (SCN), H. glycines, to reproduce on soybeans with different sources of resistance divides some SCN race 4 field populations into 2 distinct subpopulations. These subpopulations reproduce well on ''Bedford'' and plant introduction (PI) ''88788'' or PI ''89772'' and PI ''90763'' but not on both pairs of soybean lines. The ability of these subpopulations to reproduce on the 4 soybean lines was reversed by changing the soybean line used as a host during a 2nd cycle of selection. When SCN populations previously selected for reproduction on ''Bedford'' and PI ''88788'' were selected for their ability to reproduce on ''D72-8927'' and ''J74-88'', the ability of these populations to reproduce on ''Bedford'' and PI ''88788'' decreased significantly and their ability to reproduce on PI ''89772'' and PI ''90763'' increased significantly. When SCN populations, previously selected for reproduction on PI ''89772'' and PI ''90763'', were selected for their ability to reproduce on ''Bedford'', the reproduction of these populations on ''Bedford'' increased significantly and reproduction on PI ''89772'' and PI ''90763'' decreased significantly. Selection for ability of a SCN race 4 field population to reproduce on soybean lines derived from SCN race 4 resistant PI resulted in the same division of the field population into 2 distinct subpopulations. These data substantiate earlier proposals to rotate cultivars with different genes for SCN resistance as a means of managing SCN populations.