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Dale E. Kester, Richard N. Asay, and Thomas M. Gradziel

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R. L. Fery and P. D. Dukes

Abstract

The inheritance of resistance in cowpea to root knot incited by the root-knot nematodes Meloidogyne incognita (Kofoid & White) Chitwood, M. javanica (Treub.) Chitwood, and M. hapla Chitwood was determined in 3 separate greenhouse experiments. Each seed was inoculated at planting with about 2,000 eggs of the appropriate Meloidogyne species. In Experiment I, plants of parental, F1, F2, and F1 × P1 and F1 × P2 backcross generations of a cross between the resistant cultivar ‘Mississippi Silver’ and the susceptible breeding line CR 18-13-1 were tested for reaction to M. incognita. In Experiment II, plants of parental, some F1, and all F2 generations of a series of crosses involving CR 18-13-1 and the resistant lines ‘Colossus’, ‘Mississippi Silver’, ‘Iron’, and PI 353383 were evaluated for resistance to M. incognita. In Experiment III, plants of parental, F1, and 30 randomly chosen F3 lines of the ‘Mississippi Silver’ × CR 18-13-1 cross were evaluated in separate tests for reaction to M. incognita, M. javanica, and M. hapla. A single dominant gene determined resistance to M. incognita, M. javanica, and M. hapla; the same gene governed resistance in ‘Colossus’, ‘Mississippi Silver’, ‘Iron’, and PI 353383. The gene conditioned a high level of resistance, but it did not confer immunity. Roots of many resistant plants exhibited limited galling and supported some egg production by the parasites. We propose that this gene be designated Root-knot resistance and symbolized Rk.

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J. Creighton Miller Jr. and Douglas C. Scheuring

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Jorge Pinochet

‘Replantpac’ is a new plum–almond hybrid selected by Agromillora Iberia, S.L., Barcelona, Spain, for use mainly as a rootstock for Japanese plum (Prunus salicina Lindl.), peach, and nectarine [P. persica (L.) Batsch] cultivars, but it can also be used for almond [P. dulcis (Mill.) D. A. Webb, syn. P. amygdalus Batsch] and some apricot (P. armeniaca L.) cultivars. Trees are green leaf, with a vigor comparable to ‘Marianna 2624’ (P. cerasifera × P. munsoniana W. Wight & Herd.). Its high productivity, broad range of compatibility with

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Richard L. Fery and P. D. Dukes

Abstract

‘Kiawah’ (kee'-a-waw) southernpea [Vigna unguiculata] (L.) Walp.] has been released by ARS/USDA as a replacement for ‘Pinkeye Purple Hull,’ a widely grown commercial cultivar. ‘Kiawah’ is well adapted for production throughout the southeastern United States where it can be expected to produce excellent yields of high quality, pinkeye-type peas. The major attribute of ‘Kiawah’ is its high level of resistance of root knot, a major root disease of southernpea incited by several species of the root-knot nematode genus Meloidogyne. The new cultivar is named in honor of the friendly Kiawah Indian Tribe, which welcomed and helped the original English settlers of Charleston, S.C.

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Sindynara Ferreira, Luiz Antonio A. Gomes, Wilson Roberto Maluf, Vicente Paulo Campos, José Luiz S. de Carvalho Filho, and Daniela Costa Santos

bean and snap bean crops, little effort has been deployed toward obtaining resistant cultivars. Some studies demonstrate the existence of genetic variability for root-knot nematode resistance among bean accessions ( Mullin et al., 1991 ; Omwega and

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David W. Ramming and Owen Tanner

Abstract

‘Nemared’ is a new peach rootstock [Prunus persica (L.). Batsch] that combines vigorous growth in the nursery to permit early budding, root-knot nematode resistance, and red leaves to facilitate identification (Fig. 1).

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Richard L. Fery and Philip D. Dukes

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Richard L. Fery and Philip D. Dukes

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R. L. Fery and P. D. Dukes

Abstract

The ARS/USDA has announced the release of southernpea [Vigna unguiculata (L.) Walp.] breeding lines US-311 and US-427. US-311 is an early maturing, pinkeye type pea, and US-427 is a root-knot nematode (Meloidogyne spp.) resistant, brown crowder type pea. Both lines are near cultivar quality, and each is recommended for use as parental material in breeding programs.