[The cytogenetical studies of fertility restoration of some male sterile lines of alloplasmic wheat].

The frequency of cells with univalent (FCU) at MI and with lagging chromosomes and chromosomal bridge (FCLB) at AI in PMC of F1 hybrids of 4 alloplasmic 1BL:/1RS and non-1BL/1RS wheat male sterile lines with Aegilops kotschyi, Ae. variabilis, Ae. ventricosa and Ae. bicornis cytoplasms were systematically investigated, and the relationship between FCU at MI, FCLB at AI and F1 selfed seed set was analyzed. The results were as follows: (1) The frequency of abnormal chromosomes at MI and AI was higher in 1BL/1RS hybrids than in non-1BL/1RS hybrids; (2) 4 alien cytoplasms had positive effects on the FCU at MI in non-1BL/1RS hybrids; (3) The effect of 1B.1BL/1RS hetero-nucleus on meiosis was more obvious than that of alien cytoplasms in 1BL/1RS hybrids; (4) The selfed seed set of 1BL/1RS hybrids was not correlated to FCU, but was negatively correlated to FCLB; (5) The chromosomes' deeds at meiosis was more steady in non-1BL/1RS hybrids than in 1BL/1RS hybrids. The non-1BL/RS hybrids were easy to restore and restoring degree was high, and they had good prospects to be used.