Qualitative resistance of Hevea to Phyllachora huberi P. Henn |
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| Authors: | Vincent Le Guen Marc Seguin Carlos RR Mattos |
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| Institution: | (1) Cirad, BP701, Kourou Cedex, 97387, French Guyana;(2) Cirad, Avenue Agropolis (Bat 3), BP 5035 – 34032, Montpellier Cedex 1, France;(3) Michelin, Plantações Michelin da Bahia Ltda, Caixa Postal 02, Ituberá, 45435-000 (BA), Brazil |
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| Abstract: | Qualitative observations of Hevea spp. resistance to Phyllachora huberi were carried out on 200 clones in a collection and 21 full-sib progenies under natural conditions of infestation. A total
of 42 clones, mostly originating from the natural range of the Hevea genus, and at least two species (H. brasiliensis and H. benthamiana) revealed total resistance to the parasite. For nine of the thirteen `resistant ×susceptible' and `resistant × resistant'
progenies studied, the ratio of susceptible: resistant plants suggested the existence of a total resistance mechanism produced
by a dominant allele at a single locus for the P. huberi race(s) present at the study site. For three of the progenies involving the same resistant parent, it was possible to locate
the gene (called Phr) at 14.7 cm from the adhisozyme locus.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Hevea sp isozyme markers monogenic resistance Phyllachora huberi physiological race qualitative resistance |
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