Occurrence of unreduced gametes and ploidy restoration in haploid Capsicum annuum L.
Occurrence of unreduced gametes and ploidy restoration in haploid Capsicum annuum L.
复制标题
单倍体辣椒中未减少配子的发生和倍性恢复。
DOI：
10.1080/14620316.2000.11511222
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Guojian Liu
中科院分区：
文献类型：
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作者：
L. Yan;X. Z. Zhang;Guojian Liu
对单倍体辣椒的植物学、生物学特性、雄性减数分裂及后代染色体数目进行了观察。单倍体和二倍体在植物学和生物学特性上存在一定的差异。在单倍体中，由于未减数的卵子，染色体自然加倍，每个果实发育0.127粒种子，5个后代幼苗全部恢复为二倍体。减数分裂粗线期出现假联会结构。在单倍体雄性减数分裂过程中，通过第一次分裂恢复机制观察到14.2%的二倍体，收集到9.8%的未还原的活花粉。这一结果将对研究2n配子的发生和细胞遗传学机制，评价单倍体对植物进化或育种的影响，以及染色体识别和配对的研究具有重要意义。
Summary The botanical, biological characters, male meiosis and offspring chromosome numbers of a haploid Capsicum annuum L. were observed. There were some differences in botanical and biological characters between the haploid and the diploid. In the haploid, natural chromosome doubling occurred due to unreduced eggs, 0.127 seeds per fruit developed, and all five offspring seedlings were restored to diploidy. At meiotic pachytene, a pseudosynaptic structure occurred. During male meiosis of the haploid, 14.2% dyads were observed, which was through the ®rst division restitution mechanism, and 9.8% unreduced viable pollen was collected. The results would have considerable importance in the study of the occurrence and cytogenetic mechanism of 2n gametes; in the evaluation of the effects of haploidy on plant evolution or breeding, and in studies on chromosome recognition and pairing.