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This article in CS

  1. Vol. 14 No. 6, p. 872-875
     
    Received: Apr 25, 1974


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doi:10.2135/cropsci1974.0011183X001400060029x

Transgressive Segregation for Root-Knot Nematode Resistance in Cotton1

  1. R. L. Shepherd2

Abstract

Abstract

F6 families of Gossypium hirsutum L. ✕ ‘Mexico Wild’ (a root-knot tolerant primitive G. hirsutum from Mexico) were advanced through F10, with selection in greenhouse tests for resistance to root-knot nematodes [Meloidogyne incognita acrita (Kofoid & White, 1919) Chitwood, 19491. A disinfected larval screening technique effectively classified 85% of the F6 families as intermediate to highly susceptible, even though they had been selected in F2 through F4 in the field for root-knot resistance in highly infested soil.

Two F10 lines, designated A623 and A61, having the highest resistance known to root-knot in G. hirsutum, were developed. These lines were transgrassive segregates for resistance. Root-knot resistance in the F1 generation from resistant A623 ✕ susceptible ‘Stoneville 213,’ ‘Coker 201,’ and ‘Dixie King II’ was incompletely dominant.

Fusarium wilt [Fusarium oxysporum Schlecht. f. vasinfectum (Atk.) Snyd. ✕ Hans.] resistance in the above material was highly associated with root-knot resistance. Therefore, it may be possible to breed for fusarium wilt resistance by breeding solely for high root-knot resistance.

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