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  • From: William McNam <>
  • To: "" <>
  • Cc: "" <>
  • Subject: [NAFEX] Ficus carica X F. erecta
  • Date: Mon, 30 May 2011 11:47:48 -0700 (PDT)

This suggests the possibility of introducing more winter hardiness into ficus

Interspecific hybridization of fig (Ficus carica L.) and Ficus erecta Thunb.,
a source of Ceratocystis canker resistance
H. Yakushiji, T. Morita, S. Jikumaru, H. Ikegami, A. Azuma and Y. Koshita
Ceratocystis canker, which is caused by the fungus Ceratocystis fimbriata
Ellis et Halsted, is one of the most severe diseases of the common fig (Ficus
carica L.). In contrast, the wild fig species F. erecta Thunb. is resistant
to this fungus.
We performed interspecific hybridization between the common fig (seed parent)
and F. erecta (pollen parent) through artificial pollination. Even though
hybrid seeds showed high germination rates, the seedling survival rates were
low. All of the seedlings contained the expected simple sequence repeat (SSR)
alleles from both common fig and F. erecta at each of the three loci tested,
thus confirming the parent–offspring relationships of the interspecific
hybrids. The leaf morphological characters of hybrid seedlings were
intermediate between those of the parents. Cuttings of cultivars of common
fig, F. erecta, and hybrid seedlings were inoculated with C. fimbriata by
direct wounding of the shoot. All of the common fig cultivars tested withered
and died within 10 weeks. Leaves and shoots of the hybrids and F. erecta were
healthy 100 days after inoculation. Our results suggest that
interspecific hybridization between the common fig and the wild species F. 
erecta is a breakthrough in the breeding of a new fig rootstock source with
resistance to Ceratocystis canker.

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  • [NAFEX] Ficus carica X F. erecta, William McNam, 05/30/2011

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