龙葵突触突变体sy-2的遗传与小孢子发生。

S. Johnston, R. W. Ruhde, M. Ehlenfeldt, R. Hanneman
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引用次数: 16

摘要

在二倍体商业茄(Solanum commersonii) (2n = 2x = 24)中发现了一个突变体,该突变体在小孢子发生时不形成二价体。这种简单的遗传隐性性状被命名为sy-2。它通过在后期i的随机染色体分离来条件高水平的花粉不育。只有核仁相关的染色体似乎非随机分离,这可能是由于在接近成岩的细胞中核仁的融合。分叉的纺锤体结构导致多极末期I的排列,在四分体阶段产生1到7个花粉粒。产生的大多数可染花粉似乎是2n。通过这种机制形成的2n花粉应该具有与亲本完全相同的基因型,因为不会发生杂交。关键词:茄,马铃薯,2n配子,突变体(减数分裂),突变体(突触)
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Inheritance and microsporogenesis of a synaptic mutant (sy-2) from Solanum commersonii Dun.
A mutant has been found in diploid Solanum commersonii (2n = 2x = 24) in which no bivalents are formed during microsporogenesis. This trait, a simply inherited recessive, has been designated sy-2. It conditions high levels of pollen sterility through random chromosome segregation at anaphase I. Only the nucleolar-associated chromosomes appear to segregate non-randomly, possibly due to the fusion of the nucleoli as cells near diakinesis. Branched spindle configurations result in multipolar telophase I arrangements, yielding from one to seven pollen grains at the tetrad stage. Most of the stainable pollen produced appears to be 2n. The 2n pollen formed by this mechanism should bear the exact genotype of the parent, since no crossing-over occurs.Key words: Solanum, potato, 2n gametes, mutants (meiotic), mutants (synaptic).
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