A correlation of ring-shaped chromosomes with variegation in Zea mays
A correlation of ring-shaped chromosomes with variegation in Zea mays
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DOI：
10.1073/pnas.18.12.677
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发表时间：
1932-01-01
影响因子：
11.1
通讯作者：
McClintock, B
中科院分区：
文献类型：
--
作者：
McClintock, B
携带影响植物色素沉着的显性等位基因的花粉经x射线照射后置于隐性植物的蚕丝上。这是对b、pl和bm 1基因座进行的。某些F1个体呈镶嵌状，即呈现显性和隐性颜色类型的杂色。这些杂色植物具有环状染色体。由于环染色体在不同的细胞中大小不同，有时被完全消除，因此有人认为这种差异是由于携带显性等位基因的环染色体部分的体细胞消除造成的。偶尔，环染色体的大小和数量会增加。然而，只有环染色体是由环染色体产生的。通过对减数分裂中期不同环染色体及其正常同系物的突触和形态的研究，得出了b和pl位点的大致位置。基因b位于b -lg染色体短臂的中间部分。pl位点位于伴体染色体长臂的中间。
Pollen carrying the dominant allelomorphs of genes affecting plant pigmentation was x-rayed and placed upon the silks of recessive plants. This was done for the b, pl, and bm 1 loci. Certain F1 individuals were mosaics, i.e., showed a variegation composed of the dominant and recessive color types. These variegated plants possessed a ring-shaped chromosome. Since the ring chromosome varied in size in different cells, sometimes being totally eliminated, it was argued that the variegation was caused by the somatic elimination of that part of the ring chromosome which carried the dominant allelomorph. Occasionally the size and the number of ring chromosomes increased. However, only ring chromosomes arose from ring chromosomes. Studies of the synapsis and morphology of the different ring chromosomes and their normal homologues at the mid-prophase of meiosis gave the approximate location of the b and pl loci. The gene b is situated in the mid-portion of the short arm of the B-lg chromosome. The locus of pl is towards the middle of the long arm of the satellited chromosome.