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The remote hybridization and polyploid breeding in genus Rhododendron, so called azaleas and rhododendrons

Research Project

Project/Area Number 03660030
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 園芸・造園学
Research InstitutionKagoshima University

Principal Investigator

ARISUMI Ken-ichi  Kagoshima University Faculty of Agriculture Professor, 農学部, 教授 (40035100)

Co-Investigator(Kenkyū-buntansha) SAKATA Yusuke  Kagoshima University Faculty of Agriculture Associate Professor, 農学部, 助教授 (70041671)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsRhododendron / Azalea / Remote hybridization / Breeding / Polyploid / Tissue culture / Colchicine / Multiple shoot regeneration / Rhododendron属 / 遠縁支配 / 交雑親和性 / 倍数体化 / 無菌培養系 / 花色 / コルセミド処理 / 遠縁交配 / 交配親和性
Research Abstract

Genus Rhododendron consists of five subgenera. Various intersubgeneric hybridizations were conducted among four subgenera ; Hymenanthes, Rhododendron, Pentanthera and Tsutsutsi along with interspecific or remote hybridizations between species and/or cultivars belonging to section Rhododendron of subgenus Rhododendron.
Of these various hybridizations following cross combinations were succeeded and many capsules were obtained, that is, Hymenanthes Rhododendron(or reverse), Hymenanthes Pentanthera, Tsutsutsi Pentanthera and Rhododendron Pentanthera. However, seeds of Rhododendron Hymenanthes and those of Rhododendron Pentanthera failed to germinate and cross combinations, Pentanthera Hymenanthes, Pentanthera Rhododendron and Tsutsutsi Rhododendron even failed to produce capsules. As being expected, hybridizations between species and/or cultivars belonging to Rhododendron were more successful than those between subgenera, although the degree of success was inferior as compared with interspe … More cific hybridizations within Hymenanthes, Pentanthera or Tsutsutsi because of genetic divergence attained in the process of evolution in Rhododendron. The offsprings obtained from Hymenanthes Rhododendron or Hymenanthes Pentanthera were expected to produce excellent yellow cultivars, whereas almost all of those from Tsutsutsi Pentanthera failed to form chlorophyll and thus more extensive hybridizations would be needed. The offsprings obtained from crosses within Rhododendron were also expected to produce forms with excellent yellow or blue flowers. In the latter case introduction of cytoplasm of pink forms was revealed to afford more vigorous growth.
An attempt to produce polyploid was done using ordinary colchicine treatment, but it failed because summer of Kagoshima was too hot for survival of treated plants. Therefore, tissue culture was examined in which multiple shoot regeneration could induce. With the addition of cytokinins into media multiple soot production was revealed to be feasible. In the preliminary experiment, plantlets which seemed to be polyploid were obtained through 0.05% colcemid treatment for 3 to 5days. Less

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report

URL: 

Published: 1991-04-01   Modified: 2016-04-21  

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