ビワの倍数性による形態および結実特性の差異と二倍体と四倍体の交雑による三倍体の獲得  [in Japanese] Differences of Morphological and Fruit Bearing Characteristics among the Different Ploidy Plants and Triploid Production by Crossings between Diploid and Triploid Plants in Loquat  [in Japanese]

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Abstract

三倍体ビワの育種を進めるに当たり, ‘田中’ (二倍体), ‘田中’と四倍体‘田中’の交雑実生の三倍体および四倍体‘田中’の染色体数を確認し, その形態と結実性の差異を調査した. また, 四倍体ビワと二倍体ビワを正逆交雑した場合の結実性と三倍体ビワの出現率を調査した.<br>1. ‘田中’ (二倍体), ‘田中’の三倍体および四倍体‘田中’の各倍数体間には, 葉の大きさと厚さ, 気孔の大きさ, 花器の大きさ, 花弁の大きさおよび花粉粒直径に関して有意な差がみられ, 倍数性が高くなるに従ってそれらの量的な形質が増加した.<br>2. ‘田中’ (二倍体) ならびに‘田中’から作出された三倍体および四倍体系統の花房着生率はいずれもほぼ70%であり, 倍数体間に大きな差異はみられなかった. 花粉発芽率は, ‘田中’とその四倍体系統では95%と高かったものの, 三倍体系統では8%と著しく低く, その結実率も0.1%と極めて低かった.<br>3. 四倍体ビワと二倍体ビワを正逆交雑した場合, 結実率は44~74%であった. また, 獲得された実生の三倍体率は正逆交雑間に大差はみられず, 92~100%と高かった.

To facilitate efficient breeding of triploid loquats (<i>Eriobotrya japonica</i> Lindle.) by crossing diploid loquats with tetraploid loquats, we investigated differences of morphological and fruit bearing characteristics among diploid ‘Tanaka’, a tetraploid produced from the diploid ‘Tanaka’ and a triploid produced by crossing between the diploid ‘Tanaka’ and the tetraploid. In addition, we investigated the ratio of triploid seedlings produced by reciprocal crossing between diploid loquats and tetraploid loquats.<br>Leaf width and thickness, stomata length, maximal diameter of calyx, petal length and width, and pollen grain diameter in the di-, tri- and tetraploid plants significantly increased with increasing polyploidy level in loquats. The ratios of shoots bearing flower clusters were about 70% in all di-, tri- and tetraploid plants. The pollen germination ratios were high at 95% in both the diploid ‘Tanaka’ and the tetraploid. However, it was markedly low at 8% in the triploid, and the fructification was also extremely low at 0.1%. The ratios of triploid seedlings produced by reciprocal crossing between tetraploids and diploids ranged from 92% to 100%. There were no great differences among the reciprocal crosses.

Journal

  • Horticultural Research (Japan)

    Horticultural Research (Japan) 4(4), 379-384, 2005-12-15

    THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE

References:  17

Cited by:  3

Codes

  • NII Article ID (NAID)
    110002555484
  • NII NACSIS-CAT ID (NCID)
    AA11608561
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13472658
  • NDL Article ID
    7770709
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z74-C757
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE  NDL-Digital  JASI 
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