Preliminary study on the inheritance of resistance to the root-knot nematode Meloidogyne hapla in rose
1999
Wang, X. | Minot, J.C. | Voisin, R. | Esmenjaud, D. (INRA, Antibes (France). Unite sante vegetale et environnement) | Jacob, Y. | Mastrantuono, S. | Bazzano, J.
The host suitability of four rose rootstocks from the INRA collection in Frejus (France) ranging into three Rosa multiflora (designated as "K1", "K2" and "CE63") and one Rosa indica designated as "Maroc" was evaluated under greenhouse conditions using one population of each of the root-knot nematodes (RKN) Meloidogyne arenaria, Meloidogyne incognita, Meloidogyne javanica and Meloidogyne hapla. All the rootstocks expressed a high resistance to the first three RKN species and expressed different host suitability to M. hapla: the clones K1 and K2 were resistant (R) whereas CE63 and Maroc were hosts (H). Then, a preliminary study on the natural resistance character of the self-incompatible species R. multiflora to M. hapla was conducted using a diallel cross involving the above mentioned four parental clones. A total of 74 hybrids obtained from cuttings, rooted in the nursery and inoculated individually in containers were evaluated for their host suitability under a high and durable inoculum pressure of the nematodes. Plants were harvested 5 months after inoculation for a 0-5 gall index rating (10 replicates per clone) completed with nematode numbers in the roots (6 replicates per clone). As the gall index was highly significantly correlated with the log10(x+1) transformed nematode numbers in the roots, this criteria was used to express the resistance level of tested material. The 12 hybrids K1 x K2 (R x R) segregated for resistance. Fifty eight out of the 62 hybrids from R and H parents (CE63 x K1, CE63 x K2, Maroc x K1 and Maroc x K2) were more galled than their resistant parents. A preliminary genetic hypothesis based on two genes controlling rose resistance to M. hapla is proposed.
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