Breeding improved Leucaenas for forage and wood with psyllid and cold tolerance

Brewbaker, J. L. and Dalzell, S. A. (2009). Breeding improved Leucaenas for forage and wood with psyllid and cold tolerance. In: Edilberto Redona, Proceedings of 2009 14th Australasian Plant Breeding Conference (APBC) and 11th Congress of the Society for the Advancement of Breeding Research in Asia and Oceana (SABRAO). 14th Australasian Plant Breeding Conference (APBC) and Congress of the Society for the Advancement of Breeding Research in Asia and Oceania (SABRAO), Cairns, Australia, (1-10). 10-14 August 2009.

Author Brewbaker, J. L.
Dalzell, S. A.
Title of paper Breeding improved Leucaenas for forage and wood with psyllid and cold tolerance
Conference name 14th Australasian Plant Breeding Conference (APBC) and Congress of the Society for the Advancement of Breeding Research in Asia and Oceania (SABRAO)
Conference location Cairns, Australia
Conference dates 10-14 August 2009
Proceedings title Proceedings of 2009 14th Australasian Plant Breeding Conference (APBC) and 11th Congress of the Society for the Advancement of Breeding Research in Asia and Oceana (SABRAO)   Check publisher's open access policy
Journal name SABRAO Journal of Breeding and Genetics   Check publisher's open access policy
Place of Publication Bangkok, Thailand
Publisher Society for the Advancement of Breeding Researches in Asia and Oceania
Publication Year 2009
Sub-type Fully published paper
ISSN 1029-7073
Editor Edilberto Redona
Volume 41
Issue Supp.
Start page 1
End page 10
Total pages 10
Language eng
Abstract/Summary The 22 species of the woody mimosoid genus Leucaena range from Texas to Peru and from sea level to 2500 m elevation. Genetic improvement of these multipurpose trees has focused on the lowland tropical species L. leucocephala ssp. glabrata (2n=104). This species is widely used for forage and now supplements >150,000 ha of grass pastures in Queensland. Internationally it is respected for fuelwood, lumber, paper, charcoal, shade and green manure. Interspecific hybridization can facilitate its genetic improvement as a pasture legume and high-value hardwood by overcoming its susceptibility to cold temperatures and to the leucaena psyllid (Heteropsylla cubana). More than 80 interspecific hybrids have been produced in the genus. Psyllid resistance was identified in several species and has been transferred to KX2 hybrids with L. leucocephala from cold-tolerant L. pallida (2n=104). The University of Hawaii recently released the largely self-sterile “KX2-Hawaii” after six cycles of recurrent selection. The University of Queensland has a backcrossed KX2 variety in advanced stages of breeding. Genetic improvement involves only the arboreal subspecies glabrata, not the shrubby subspecies leucocephala. Arboreal KX3 hybrids of L. leucocephala with the highland Mexican L. diversifolia (2n=104) have excelled in wood production in cooler tropics. As 18 of the 22 species are diploids (2n=52 or 56), many hybrids are sterile triploids. Among these KX4 (L. leucocephala × L. esculenta) and KX5 (L. diversifolia × L. trichandra) are attractive as high-value hardwoods grown on 10 to 12 year coppiced rotations. Chromosome doubling offers promise for inducing self- and cross-fertility of species like L. collinsii ssp. collinsii, L. lanceolata var. sousae and L. multicapitula and additional gene transfer of genes for cold and even frost tolerance from L. trichandra, L. pulverulenta, L. retusa and L. greggii. Collaboration between Hawaii and Queensland on leucaena improvement began in 1961, and continues to provide the best source of quality seeds. Expanded utilization of improved cultivars is notable in Australia, India, Paraguay, Thailand and SE Asia.
Keyword Leucaena
Forage
Wood
Biomass
Hybrids
Genetic improvement
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Proceedings of the Joint 14th Australasian Plant Breeding Conference and 11th SABRAO Congress held on August 9-14, 2009 at Cairns Convention Center, Cairns Australia were published in a special issue (Special Supplement August 2009) of the journal as CD-ROM.

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Created: Fri, 22 Jul 2011, 10:39:45 EST by Ms Lynette Adams on behalf of School of Agriculture and Food Sciences