Estimating the Inheritance for Parthenogenesis in Tetraploid Chinese Leek (Allium ramosum, syn. A. tuberosum)

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  • Nakazawa Yoshiko
    Tochigi Prefectural Agricultural Experiment Station Present address: Kawachi Agricultural Promotion Office
  • Namai Kiyoshi
    Tochigi Prefectural Agricultural Experiment Station
  • Kojima Akio
    National Agriculture and Food Research Organization National Institute of Vegetables and Tea Science
  • Kobayashi Shunichi
    Tochigi Prefectural Agricultural Experiment Station
  • Tasaki Kimihisa
    Tochigi Prefectural Agricultural Experiment Station
  • Amagai Masayuki
    Tochigi Prefectural Agricultural Experiment Station

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Other Title
  • 四倍体ニラにおける単為発生性の遺伝様式
  • 4バイタイ ニラ ニ オケル タンイ ハッセイセイ ノ イデン ヨウシキ

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Abstract

The expression of parthenogenesis in tetraploid Chinese leek (Allium ramosum, syn. A. tuberosum 2n=32) was analyzed by observing the cleared ovules and performing RAPD-PCR on a F1 population generated by crossing tetraploid amphimictic individuals with a tetraploid parthenogenetic cultivar. The results from the hybridization indicated that the amphimictic and parthenogenetic reproductive behaviors segregated. RAPD analysis showed that the progeny of amphimictic individuals, except for one individual (00-03-14), displayed a completely hybrid origin. In addition, ovule analysis for four of these F1 populations revealed that the parthenogenetic and non-parthenogenetic expression segregated in an approximately 1:1 ratio when the amphimictic cultivar was pollinated with the cv. Tender-pole. A chi-square test suggested that cv.Tender-pole harbored one locus related to parthenogenesis. Almost all the examined F1 individuals derived from the crossing of the five non-parthenogenetic individuals (97-11-7, 97-12-43, 97-12-85, 00-02-3, 00-02-187) as seed parents, exhibited hexaploidy (namely BIII-derived hybrids). Since the RAPD marker that is specific to the pollen parent (cv.Tender-pole) had segregated in 95% of the hexaploid F1 individuals in the (97-12-43×cv. Tender-pole) population, recombination occurred between the diplospory locus and the parthenogenesis locus in the 6× amphimictic individuals.<br>

Journal

  • Breeding Research

    Breeding Research 8 (3), 89-98, 2006

    Japanese Society of Breeding

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