HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Austin, M. T. Articles by Sun, W. Search for Related Content PubMed Articles by Austin, M. T. Articles by Sun, W. Agricola Articles by Austin, M. T. Articles by Sun, W.

Yield, Psyllid Resistance, and Phenolic Concentration of Leucaena in Two Environments in Hawaii

Hawaii Agric. Res. Ctr., 99-193 Aiea Heights Dr. Suite 300, Aiea, HI 96701
Dep. of Animal Sci., Univ. of Hawaii, Honolulu, HI 96822

James L. Brewbaker and Weiguo Sun

Dep. of Horticulture, Univ. of Hawaii, Honolulu, HI 96822.

^* Corresponding author (maustin{at}harc-hspa.com).

Interspecific hybridization in the genus Leucaena produces hybrid vigor, resulting in highly adaptable varieties that expand the growth range of the genus. This study was conducted to test the total biomass (combined stem and forage fraction), total forage dry matter (DM) yield, psyllid (Heteropsylla cubana Crawford) damage, and phenolic concentration of Leucaena F₁ hybrids in comparison with species-level selections in two distinctly different environments. A total of 19 Leucaena spp. and hybrid selections were tested for 2 yr at the Waimanalo and Mealani Research Stations in Hawaii. Thirteen species and hybrid selections were replicated three times and included species selections from L. pallida Britton & Rose; L. leucocephala (Lam.) de Wit; L. diversifolia (Schlechtend.) Benth. (2n = 4x); and L. trichandra (Zucc.) Urban [syn. L. diversifolia (Schlechtend.) Benth. subsp, trichandra (Urban) F.J. Pan] (2n = 2x). Additionally, five selections were interspecific F₁ hybrids and two were advanced-generation interspecific hybrids. Six other selections were augmented in the trials. Over 2 yr, L. pallida x L. leucocephala F₁ hybrids (K748 x K636 and K748 x K584) had the highest DM yield at both locations. At Waimanalo, K748 x K636 produced 53.4 Mg ha^–1 total DM biomass of which 24.6 Mg ha^–1 was forage, while at Mealani, K748 x K636 produced 29.4 Mg ha^–1 total DM biomass and 9.6 Mg ha^–1 forage. These yields were twice those of L. leucocephala at Waimanalo and eight times greater at Mealani. Leucaena leucocephala was the most susceptible to psyllid damage (P < 0.001), while the most resistant was L. trichandra (2n = 2x). Leucaena pallida hybrids had intermediate levels of psyllid resistance. Psyllid damage was negatively correlated with forage DM once at Waimanalo (r = –0.37, P < 0.05, n = 42). Forage phenolic concentration averaged 110 mg g^–1 for all treatments at both locations and was correlated once to psyllid damage (r = 0.32, P < 0.05, n = 42) at Waimanalo. Superior yield, psyllid resistance and cold tolerance of L. pallida x L. leucocephala hybrids was observed at low and high elevation sites.

Received for publication June 10, 1996.

This article has been cited by other articles:

				J. L. Brewbaker Registration of KX2-Hawaii, Interspecific-Hybrid Leucaena Journal of Plant Registrations, September 1, 2008; 2(3): 190 - 193. [Abstract] [Full Text] [PDF]