1ST DIVISION RESTITUTION GAMETES THROUGH FERTILE DESYNAPTIC MUTANTS OF POTATO
1ST DIVISION RESTITUTION GAMETES THROUGH FERTILE DESYNAPTIC MUTANTS OF POTATO
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DOI：
10.1007/bf00021442
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发表时间：
1983-01-01
期刊：
影响因子：
1.9
通讯作者：
RAMANNA, MS
中科院分区：
文献类型：
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作者：
RAMANNA, MS
二倍体马铃薯[Solanum phureja.马铃薯（Solanumtuberosum）（2n = 2x = 24）产生可育2n花粉的频率较高。这样的2n花粉粒可能是通过整个染色体的等长分裂产生的，因此，是第一次分裂恢复（FDR）的起源。由于第二次分裂恢复（SDR）配子在不突触突变体预计会流产，因为染色体数目的不平衡，可育的2n配子可能构成同质群体的FDR配子。在6个杂交组合的306个后代中，共检测到76个突触缺失突变体。其中，23个突变体的花粉育性超过20%。其中一些可育突变体已成功用作花粉亲本。几乎所有的可育突变体都是由产生2n花粉的亲本杂交产生的。在2个杂交中，其中一个亲本正常（仅产生n花粉），另一个亲本产生2n花粉，几乎所有突变体要么雄性不育，要么花粉育性低于20%。联会消失受单隐性基因ds控制，但减数分裂核恢复的遗传似乎是难以捉摸的。尽管在育种计划中使用突触消失基因可能会产生某些缺点，但也有某些优点。
Desynaptic mutants of diploid potato [Solanum phureja .times. Solanum tuberosum] (2n = 2x = 24) produced a fairly high frequency of fertile 2n pollen grains. Such 2n pollen grains may be expected to originate through an equational division of the entire chromosome complement, and therefore, of 1st division restitution (FDR) origin. Since 2nd division restitution (SDR) gametes in desynaptic mutants are expected to abort because of the imbalance of chromosome number, the fertile 2n gametes may constitute homogeneous populations of FDR gametes. Among a total of 306 progeny derived from 6 crosses, 76 desynaptic mutants were detected. Of these, 23 mutants had more than 20% pollen fertility. Some of these fertile mutants were successfully used as pollen parents. Almost all the fertile mutants derived from crosses involving parents both of which produced 2n pollen. In 2 crosses in which one of the parents was normal (producing only n pollen), with the other being 2n pollen producer, almost all the mutants were either male sterile or had below 20% pollen fertility. Desynapsis was controlled by a single recessive gene ds, but the inheritance of meiotic nuclear restitution appeared to be elusive. Despite certain drawbacks that may arise from the use of desynaptic gene in a breeding program, there are certain advantages as well.