COTTON RESISTANCE TO ROOT-KNOT NEMATODE .1. PENETRATION AND REPRODUCTION

被引:33
作者
CREECH, RG [1 ]
JENKINS, JN [1 ]
TANG, B [1 ]
LAWRENCE, GW [1 ]
MCCARTY, JC [1 ]
机构
[1] USDA ARS,CROP SCI RES LAB,MISSISSIPPI STATE,MS 39762
关键词
D O I
10.2135/cropsci1995.0011183X003500020012x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Nematode parasitism of cotton (Gossypium hirsutum L.) has become increasingly important because of yield losses and increased distribution across cotton production regions. Penetration and reproduction of root-knot nematodes, Meloidogyne incognita (Kofoid & White) Chitwood, Race 3, was compared on three cotton genotypes differing in level of resistance: M-8, susceptible to root-knot; M-78 (M-78RNR), moderately resistant; and M-315 (M-315RNR), resistant. Responses were characterized by penetration of plant roots by root-knot nematode juveniles and by reproduction, measured as number of eggs, egg-masses per plant, and eggs per egg-mass. Susceptible, moderately resistant, and highly resistant cotton genotypes were penetrated about equally by juveniles. Production of egg-masses, eggs per egg-mass, and eggs per plant by nematodes were different among the three cotton genotypes. The development of egg masses was delayed in M-78 and M-315 as compared with M-8, with the greatest delay and prevention of the formation of significant numbers of egg-masses in the highly resistant M-315. Production of eggs and second-stage infective juveniles in the moderately resistant M-78 were sufficient to contribute significantly to the build-up of the next generation of root-knot populations in cotton production fields. Reproduction on M-315 was so low that nematode populations would be expected to decrease significantly under continuous culture. M-315 possesses two major genes for resistance and is a valuable source of root-knot nematode resistance for cotton improvement programs. These genes in combination do not alter penetration of the root-knot nematode juvenile stage into cotton roots, but do have major negative effects on survival and reproduction of the nematodes.
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页码:365 / 368
页数:4
相关论文
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    JENKINS, JN
    CREECH, RG
    TANG, B
    LAWRENCE, GW
    MCCARTY, JC
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