| Autor: |
Branch, W.D., Brenneman, T.B., Noe, J.P. |
| Předmět: |
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| Zdroj: |
Peanut Science; Jan2016, Vol. 43 Issue 1, p49-51, 3p |
| Abstrakt: |
Root-knot nematode (RKN), [ Meloidogyne arenaria (Neal) Chitwood race 1] can result in highly significant yield losses in peanut ( Arachis hypogaea L.) production. Fortunately, very high levels of RKN nematode resistance have been identified and incorporated from wild species into newly developed peanut cultivars. In 2011-12 at Tifton, GA, a field site was artificially inoculated with M. arenaria race 1. A susceptible cultivar was used to uniformly increase the peanut-specific race 1 nematode population during the summer and fall; whereas, hairy vetch ( Vicia villosa Roth) was used for the same purpose each winter as a susceptible cover crop. During 2013 and 2014, space-planted F2 and F3 populations from cross combinations involving A. hypogaea susceptible × resistant parental lines derived from 'COAN' were evaluated, respectively. Several past inheritance studies had suggested a single dominant gene, R ma, controlled the resistance. However in this study, the occurrence of a second recessive gene ( rma2) was also found to be involved in very high peanut RKN resistance. Inheritance data fit a 13:3 genetic model and confirmed an earlier report for two RKN-resistance genes ( Rma1 and rma2) found in TxAG-6 and now COAN. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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