Randell, R. A., D. E. Gardner, and C. W. Morden. 1999. Hybridization among endemic and naturalized species of raspberry (Rubus) in the Hawaiian Islands. Abstracts of the 1999 Hawaii Conservation Conference; 27-28 July, 1999; Honolulu, Hawaii. P. 36.
ABSTRACT
A population of putative hybrids between an endemic 'akala (Rubus hawaiiensis) and a naturalized thimbleberry (Rubus rosifolius) was discovered in Kipahulu Valley, on the island of Maui. Although hybridization between endemic and naturalized species has been performed artificially, this project provides the first documented evidence of a naturally occurring case in Hawai'i. The goal of this study was to characterize this natural hybridization event, investigate the mode of hybridization and determine the male fertility of the FI hybrids. By examining this hybrid event, we are able to directly examine an important evolutionary process, determine whether the hybrids pose an ecological threat and highlight the importance of maintaining active alien species control programs in Hawai'i. Intermediate morphological characteristics shared by these plants. Randomly Amplified Polymorphic DNA (RAPD) analysis indicated genetic similarity within species is high and between species is low. Similarity of the hybrids to each species is intermediate to parent populations. Presence of alleles in hybrid individuals was additive. Sequence analysis of the chloroplast gene ndhF suggests that R. rosifolius was the maternal parent in the cross, whether this occurred either as a single hybridization event with seeds spread to both colonies or as multiple events is unknown.
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HOSTS
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PATHOGENS
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RELEVANT TO BIOCONTROL
No.
KEY WORDS
HybridizationRubus hawaiiensis, Rubus rosifolius.
