再生小麦—麦草9号的形态学与细胞遗传学研究

Study on Morphological and Cytogenetical of Regenerate Wheat-Maicao No.9

对普通小麦与中间偃麦草远缘杂交后代中选育的八倍体小偃麦—麦草9号进行了形态学和细胞学鉴定。结果表明:麦草9号植株高大,结实性较好,籽粒饱满,生长旺盛;根尖细胞染色体数目为2n=56,对其进行花粉母细胞减数分裂观察,中期Ⅰ具有一定数量的单价体、环状二价体、棒状二价体;后期Ⅰ、后期Ⅱ与四分体时期都出现不同数量的落后染色体、染色体桥、微核等现象。这些现象表明中间偃麦草的E组染色体进入了普通小麦的基因组,影响ABD组染色体配对。

Morphological and Cytogenetics of octoploid trititrigias Maicao No. 9,distant bred from the progeny of conmlon wheat and thinopyrum intermedian were studied. The result showed that the plant of Maicao No. 9 was .tall,with good fecundity,fully filled grain and vigorous growth. The chromosome number of the root cells was 2n 56,through the nhservation of pollen mother cells meiosis,there were a certain amount of univalents, ring bivalents and bar bivalents in PMCM. Different numbers of lagging chromosomes,chromosome bridges and micronucleus were found in anaphaseⅠ,anaphase Ⅱ and tetraspore. Those showed that the E chromosome of thinopyrum interrnedium inserted the genoruc of corrmlon wheat,and it disarranged the original matching of chromosome.