http://www.cnr.it/ontology/cnr/individuo/prodotto/ID188026
Barriers to interspecific hybridization between Juglans nigraL. and J. regia L species (Articolo in rivista)
- Type
- Label
- Barriers to interspecific hybridization between Juglans nigraL. and J. regia L species (Articolo in rivista) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1007/s11295-012-0555-y (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Paola Pollegioni;Irene Olimpieri; Keith Woeste; Giovanni De Simoni;Maria Gras;Maria Emilia Malvolti (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- U.S.D.A. Forest Service, Hardwood Tree Improvement and
Regeneration Center, Department of Forestry and Natural
Resources, Purdue University,
715 West State Street,
West Lafayette, IN 47907-2061, USA
M. Gras
C.R.A--Research Unit for Wood Production Outside Forests,
Via Valle della Quistione 27,
00166 Rome, Italy (literal)
- Titolo
- Barriers to interspecific hybridization between Juglans nigraL. and J. regia L species (literal)
- Abstract
- uglans nigra and Juglans regia are phylogenetically
divergent species. Despite the economic interest in
Juglans×intermedia (J. nigra×J. regia), walnut hybridization
is rare under natural conditions and still difficult using
controlled pollination. Here, we evaluated some reproductive
mechanisms that may prevent successful natural hybridization.
The study of flowering phenology of 11 J. nigra and
50 J. regia trees growing in a plantation provided information
regarding the opportunity for interspecific crosses. Variation
in flower size, pollen quality of putative donors, and
variation in seed yield and rate of hybrid production among
putative maternal trees were examined. DNA fingerprinting
and parentage analyses based on nine microsatellites permitted
the identification of hybrids and hybridogenic parent.
Our data indicated that overlap occurred between the staminate
flowering of protogynous J. regia and the beginning of
pistillate flowering of protogynous J. nigra. Differences in
floral size were computed between walnut species. Only
three hybrids among 422 offspring of eleven J. nigra
progenies were identified. Interspecific hybridization
involving pollination of one early-flowering-protogynous
J. nigra by three protogynous J. regia trees was detected.
The correct development of J. regia male gametophytes,
high pollen viability (86.5 %), and germination (57.6 %)
ruled out the possibility that low pollen quality contributed
to depressed hybrid production. Our findings indicated
that these two species tended to remain
reproductively isolated. The substantial disjunction in
flowering time and additional prezygotic barriers such
as differences in floral size and conspecific pollen
advance may affect interspecific gene flow between J.
regia and J. nigra. (literal)
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