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The Breeding for Development of Rhododendrons and Azaleas with Heat Resistance and New Flower Colors

Research Project

Project/Area Number 63560032
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) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1990: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1989: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1988: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsBreeding / Heat resistance / New flower color / Rhododendron / Azalea / Intersubgeneric cross / Anthocyanin / Flavonol / 交配不和合性 / 不稔性 / 耐暑性ツツジ
Research Abstract

Some lepidote rhododendrons (LR) which have morphological characteristics similar to Evergreen Azaleas (EA) have excellent blue flower colors. Their fundamental defect is, however, their lack of heat resistance. Moreover, cross-incompatibility and/or hybrid sterility are frequently encountered. Incomplete diallele crosses using 26 species and cultivars were conducted. Two species and 7 cultivars were selected as promising breeding materials from their cross-ability, heat resistance, and ornamental characteristics. Further crosses using these materials were conducted, in which initial crosses between some LR and R. Eriocarpum, a heat resistant EA from Tokara Archipelago, were successful.
Pigment components of blue, purple, pink, rose and red rhododendrons were compared using HPLC. Hydroxylation and methylation of anthocyanin, total amount of flavonol and its methylation, and copigmentation between anthocyanin and flavonol were important factors towards development of bluer hues, although … More action of hydroxylation of anthocyanin seemed to be most prominent. In the course of this analysis, an unknown yellow pigment was also revealed to be present in some rose and red rhododendrons, The possibility for another breeding approach to intensify yellow flower color was thus suggested.
Intersubgeneric crosses among EA/Deciduous Azaleas (DA) and LR/Elepidote Rhododendrons (ER) were implemented to develop hybrids with intense yellow color and other ornamental characteristics. Hybrid seeds from ER x DA and ER x LR germinated, but normal sized hybrid seeds from LR x DA, EA x DA and LR x ER did not germinate. In addition, a fairly severe interspecific barrier was found in crosses within yellow LR. The necessity for polyploid breeding is suggested.
About 44,665 ER seedlings were screened for heat resistance in a plastic house. It was suggested that improvement of heat resistance is possible through selection of appropriate parental materials, repetition of crosses, and strict progeny selection. Less

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report

URL: 

Published: 1988-04-01   Modified: 2016-04-21  

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