J Integr Plant Biol. ›› 1999, Vol. 41 ›› Issue (11): -.

• Research Articles •    

Cytogenetic Studies on the Cross generations Between Triticum aestivum and Eremopyrum orientale

ZHANG Gui-Fang, LIU Jian-Wen, HUANG Yuan-Zhang, DING Min, TANG Shun-Xue and JIA Xu   

Abstract: The cytogenetics of the backcross generations and self-bred progenies (BC2F1, BC3F1, BC2F2, BC3F2 and BC2F3) of intergenetic hybrid of Triticum aestivum L. x Eremopyrum orientale (kedeb) Jaub. Et Spach were studied. The results showed that the plants BC3F1 (2n = 43 ) isolated from the backcross generations of the plants (2n = 44 ) accounted for 41.09%, but the plants (2n = 44) isolated was only 4. 11%, and the plants BC2F2 (2n = 44) isolated from self-cross generations of the plants BC2F1 (2n = 44) accounted for 13.21%. The number of univalents in pollen mother cells was higher in some plants (BC2F1) and the averages of univalents were negatively related to the backcross seed-setting and self-cross seed-setting with a related coefficient of - 0.6766* and -0.7429* respectively. The results of genomic in situ hybridization (GISH) showed that some plants of BC2Fs (2n=44) contained different number of alien chromosomes. All those indicated that alien chromosomes caused unusual pairing and segregation of wheat homologous chromosomes and also lowed the hereditary stability of wheat chromosomes.

Key words: Triticum aestivum, Erempyrum orientale, Cytogenetic, Genomic in situ hybridization (GISH)

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