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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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RELEVANT TO BIOCONTROL
No.

KEY WORDS
HybridizationRubus hawaiiensis, Rubus rosifolius.

IMAGES
22_081 -- Puccinia striiformis var. dactylidis III on Dactylis glomerata 22_081 - Puccinia striiformis var. dactylidis III on Dactylis glomerata
PATHOGEN: Aspergillus melleus
22_082 -- Puccinia striiformis var. dactylidis III on Dactylis glomerata 22_082 - Puccinia striiformis var. dactylidis III on Dactylis glomerata
PATHOGEN: Aspergillus melleus
24_080 -- poster - hybridization of native and naturalized Rubus in Hawaii 24_080 - poster - hybridization of native and naturalized Rubus in Hawaii
PATHOGEN: Aspergillus melleus
24_081 -- Rubus poster in St. John, 6th floor, for XVI Botanical Congress, St. Louis MO 24_081 - Rubus poster in St. John, 6th floor, for XVI Botanical Congress, St. Louis MO
PATHOGEN: Aspergillus melleus
29_082 -- Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell) 29_082 - Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell)
PATHOGEN: Aspergillus melleus
29_083 -- Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell) 29_083 - Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell)
PATHOGEN: Aspergillus melleus
29_084 -- Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell) 29_084 - Rubus hawaiensis in Bird Park with damage by Schreckensteinia festaliella Hubner (picture by Rebecca Rondell)
PATHOGEN: Aspergillus melleus
29_085 -- site 1 Kipahulu Valley - Rubus rosifolius X Rubus hawaiensis hybrids attacked by Schreckenstein festaliella Hubner (photo by Rebecca Rondell) 29_085 - site 1 Kipahulu Valley - Rubus rosifolius X Rubus hawaiensis hybrids attacked by Schreckenstein festaliella Hubner (photo by Rebecca Rondell)
PATHOGEN: Aspergillus melleus
29_086 -- site 1 Kipahulu Valley - Rubus rosifolius X Rubus hawaiensis hybrids attacked by Schreckenstein festaliella Hubner (photo by Rebecca Rondell) 29_086 - site 1 Kipahulu Valley - Rubus rosifolius X Rubus hawaiensis hybrids attacked by Schreckenstein festaliella Hubner (photo by Rebecca Rondell)
PATHOGEN: Aspergillus melleus


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