Invasion, development, and reproduction of 3 Meloidogyne species on oat cultivar Tachiibuki, a nematode-suppressive fall crop
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概要
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The degrees of susceptibility of oat cultivars Tachiibuki and Haeibuki to infection by 3 <I>Meloidogyne</I> species (<I>M. incognita, M. arenaria</I>, and <I>M. hapla</I>) were examined. Reproduction rates of 3 <I>M. incognita</I> populations on Tachiibuki in greenhouse experiments were low, and this confirmed our previous field experiments. The reproduction rates of 3 <I>M. arenaria</I> populations were low on Tachiibuki and on Haeibuki, whereas the latter is a suitable host for <I>M. incognita</I>. With regard to invasion of second-stage juveniles (J2), similar rates were observed for <I>M. incognita</I> and <I>M. arenaria</I> on Tachiibuki and Haeibuki roots 5 days after inoculation at 25°C. After 30 days, however, Tachiibuki roots inoculated with <I>M. incognita</I> or <I>M. arenaria</I> contained only a small number of mature females compared to the suitable nematode hosts. Most J2 nematodes on Tachiibuki roots were undeveloped and a relatively high percentage of males was observed. We conclude that the low rates of reproduction of these 2 root-knot nematode species on Tachiibuki can be attributed to the inhibition of development from the J2 stage to mature females. For the 3 <I>M. hapla</I> populations, reproduction was close to zero and root invasion was minimal on both oat cultivars.
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