六倍体ライコムギの2D-2R染色体置換の原因となる種子稔性と核・細胞質相互作用

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  • Nucleo-cytoplasmic interaction in the seed fertility causing the 2D-2R substitution in hexaploid triticale.
  • 6倍体ライコムギの2D-2R染色体置換の原因となる種子稔性と核・細胞質相互作用〔英文〕
  • 6バイタイ ライ コムギ ノ 2D-2R センショクタイ チカン ノ ゲンイン

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The effect of chromosomes 2D and 2R on the seed fertility of hexaploid triticale was investigated to know whether 2D is responsible for the high seed fertility which causes the preferential chromosome substitution of 2D for 2R. Using three parental lines ; (1) S78, a hexaploid substitutional triticale line (genome formula, AABBR'R') with aestivum (aes) cytoplasm, where R' stands for 2D-2R substitution in R genome, (2) Beagle, a hexaploid line (AABBRR) and (3) (cer)-JM135, a hexaploid line (AABBRR) with cereale (cer) cytoplasm, crossings were made between S 78 and Beagle, and (cer)-JM135 and S 78. Combining the two cytoplasms, (aes) and (cer), and the two genome canstitutions, AABBRR and AABBR'R', plants of four nucleo-cytoplasmic genotypes, (aes)-AABBRR, (aes)-AABBR'R', (cer)-AABBRR and (cer)-AABBR'R' were identified at the F2 and F3 generations and their seed fertilities were examined. Marked relatioriships between the four genotypes and their seed fertilities were found as follows : (1) chromosome 2D gave high seed fertility in (aes) cytoplasm but low seed fertility in (cer) cytoplasm, (2) chromosome 2R gave both low and high seed fertility in (aes) and (cer) cytoplasm, however, 2R was necessary to high seed fertility in (cer) cytoplasm (Fig. 2). The results indicated that the favorable effect of 2D over 2R on the seed fertility under (aes) cytoplasm resulted in the 2D-2R substitution in secondary hexaploid triticale.

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