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Differences in Egress of Male and Female Pratylenchus penetrans from Pea Roots

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Journal of Nematology
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Abstract

Differences in Egress of Male and Female Pratylenchus penetrans from Pea Roots J ourna l o f Nemato logy 22(4):614-617. 1990. © The Society o f Nematologists 1990. Differences in Egress of Male and Female Pratylenchus penetrans from Pea Roots 1 D.J . WIXTED AND A. E. MACGUIDWIN 2 Key words: attract ion, behavior , egress, infection, migrat ion, Pratylenchus penetrans. Pratylenchus spp. are migratory endopar- asites of plants. Despite being obligate par- asites, however, a significant proport ion of the populat ion can be recovered outside of roots throughout the year (7,8). Pratylen- chus agilis Thorne & Malek (10), P. crenatus Loof (5), and P. penetrans (Cobb) Filipjev & Schuurmans Stekhoven (Wixted, un- publ.) can feed ectoparasitically, indicating that movement out of roots does not nec- essarily prohibit feeding. Our objective was to determine if move- ment out of roots differs between the sexes o f P. penetrans. Differences in the rate of root penetrat ion among the sexes were previously reported (13). Under certain conditions, males ofP. penetrans comprised a larger proport ion of the total soil pop- ulation than did other stages (9). However, whether this was due to more males than other stages having left roots, or whether males comprised most o f the total soil and root population, was not clear f rom their studies. Sex-specific differences in move- ment within hosts do occur with Nippo- strongylus brasiliensis (Travassos) Travassos & Darriba in the mouse intestine (4), where males disperse over a larger percentage of the intestine than do females in single-sex inoculations. Two exper iments were conducted using an in vitro system. Pratylenchus penetrans f rom monoxenic corn (Zea mays L. cv. IO Chief) root explants grown in Gamborg's Received for publication 9 February 1990. 1 This research was funded in part by USDA ARS Grant No. 88-37153-3498. Research Specialist and Associate Prof

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