GENETIC CONTROL OF THE CYTOLOGICALLY DIPLOID BEHAVIOUR OF HEXAPLOID WHEAT
GENETIC CONTROL OF THE CYTOLOGICALLY DIPLOID BEHAVIOUR OF HEXAPLOID WHEAT
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DOI：
10.1038/182713a0
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发表时间：
1958-01-01
期刊：
影响因子：
64.8
通讯作者：
CHAPMAN, V
中科院分区：
文献类型：
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作者：
RILEY, R;CHAPMAN, V
41条染色体的小麦单体系HH与44条染色体的小麦植株杂交，产生了20条染色体的缺单倍体植株，其中除了HH为单体的植株外，其余染色体均为小麦染色体。这些nullihaploids表现出显着较高的频率比21染色体的真单倍体的Holdfast的二价体和三价体。同样，三个40染色体缺体缺陷的HH对都有大和频繁的多价体和相关的单价体。结论是HH染色体是负责抑制homeoprotein协会。具有20对正常小麦染色体和由HH染色体长臂形成的等染色体的单倍体植株表现为真单倍体，而在具有20对正常小麦染色体和仅由长臂端着丝粒代表的HH染色体的41-染色体单体中，没有观察到多价体形成，这表明二价体形成的控制可能限于长臂。
Crosses of the 41-chromosome monosomic line HH, which is derived fromTriticum vulgare'Holdfast' and resembles other monosomics in meiotic behaviour, with 44-chromosome plants carrying the full complement of wheat chromosomes plus a pair of ryechro mosomes, gave rise to a number of 20-chromosome nullihaploid plants carrying all the wheat chromosomes except that for which HH is monosomic. These nullihaploids exhibited a markedly higher frequency of bivalents and trivalents than did 21-chromosome euhaploids of Holdfast. Similarly, three 40-chromosome nullisomics deficient for the HH pair all had large and frequent multivalents and associated univalents. It is concluded that the HH chromosome is responsible for the inhibition of homeologous associations. A haploid plant with 20 normal wheat chromosomes plus the isochromosome formed from the long arm of the HH chromosome behaved as the euhaploids, and in a 41-chromo-some monosomic with 20 pairs of normal wheat chromosomes and an HH chromosome represented only by a telocentric of the long arm, no multivalent formation was observed, suggesting that control of bivalent formation may be restricted to the long arm.