Details for: PI 651861, Leucaena hybr., 'KX2-Hawaii'


Summary Data
Taxonomy:
Leucaena hybr.
Cultivar:
'KX2-Hawaii'
Origin:
Developed – Hawaii, United States
Maintained:
Historic Record
Received by NPGS:
06 Dec 2007
Improvement Status:
Cultivar
Reproductive Uniformity:

Population
Form Received:
Seed
Life Form:
Perennial
Life Cycle:
Perennial
Availability
This is historical information about this accession. It no longer exists and can not be requested.
 
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Core Passport Data
Taxonomy:
Leucaena hybr.
Cultivar:
'KX2-Hawaii'
Origin:
Developed – Hawaii, United States
Maintained:
Historic Record
Received by NPGS:
06 Dec 2007
Improvement Status:
Cultivar
Reproductive Uniformity:

Population
Form Received:
Seed
Life Form:
Perennial
Life Cycle:
Perennial
Source History
Developed

Hawaii, United States

Developer(s):
Accession Names and Identifiers
'KX2-Hawaii'
Type: Cultivar name

DUPLICATE OF PI 647963
Type: Duplicate accession name

Narrative
Arboreal tropical legume to a height of 15m that was bred largely as a forage crop, to be browsed or harvested periodically (8-16 wks). Distinguished from the parent species by leaf and leaflet morphology, flower head size and color, and pod and seed size. For each of the 5 cycles of selection, ~ 1500 trees were planted and coppiced repeatedly over a period of 2-3 years, selecting the outstanding 100+ trees as seed parents. Is resistant to the psyllid, to which its L. leucocephala parent is susceptible, and grows vigorously under cold temperatures that dwarf the L. leucocephala parent. Forage yields are treble those of the L. pallida, a highland Mexican species (also 2n=104) chosen for its resistance to the psyllid, tolerance of cold weather, and its self-sterility. The population is derived from seed orchards in which only self-sterile trees are retained, but due to segregation of S alleles there will be some self-fertile trees in the population. Orchardists are encouraged to rogue out self-fertile trees, to reduce seediness and potential invasiveness while improving fodder and wood yield.
Leucaena hybr.
Genus:
Leucaena
Family:
Fabaceae (alt. Leguminosae)
Subfamily:
Caesalpinioideae
Tribe:
Mimoseae
Nomen number:

315884
Comment:
interim designation used in GRIN for Leucaena hybrids which lack an acceptable binomial
Verified:
01/17/1991 by ARS Systematic Botanists.
Other conspecific taxa
Autonyms (not in current use), synonyms and invalid designations
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Pedigree
Description:
Derived from the interspecific hybrid made in 1976 between Leucaena leucocephala cv. K8 (PI 263695) and L. pallida cv. K376. Hybridization was followed by 5 cycles of recurrent mass selection for self-sterility, for tolerance of the psyllid insect, Heteropsylla cubana Crawford and for forage yield.