终变期

终变期：减数分裂第一次分裂前期中的最后一个阶段。

Diakinesis The last stage of the PROPHASE in the first division of MEIOSIS .

担子减数分裂的持续时间为18小时，其中细线期和偶线期5.9小时、粗线期6.2小时、双线期和终变期3.4小时、中期10.5小时、后期Ⅰ到四分体2小时；

It took 18 hours for basidia from karyogamy to completion of meiosis , including leptotene and zygotene 5.9 hrs , pachytene 6-2 hrs , diplotene and diakinesis 3.4 hrs , metaphase I 0.5 hrs and anaphase I - tetrad 2 hrs .

雄株的性染色体在减数分裂终变期时，形成Y1XY2的链状三价体，中期Ⅰ时形成v字形或环状，偶有形成XY二价体和一个Y单价体。

The sex-chromosomes of male plant exhibit a chain of trivalent ( Y_1-X-Y_2 ) in diakinesis of PMC meiosis . At metaphase I , they make a V-shaped or a ring configuration . Some of them may form a XY-bivalent and a Y - univalent .

核仁消失，但有的植物在终变期的早期核仁仍然很大。

Nucleolus disappeared , but some plants in the early diakinesis nucleolus remains high .

（逐渐）减少，缩小收缩的小孢子母细胞中核进入减数分裂终变期。

The nucleus in shrinking cytoplasm of microspore mother cell enters into diakinesis stage.16 .

在第一次分裂的终变期或中期，有29个二价体。

At diakinesis or metaphase in the first division of meioses , 29 divalents appeared .

前期可被分为连续的阶段：细线期、偶线期、粗线期、双线期和终变期。

Prophase may be divided into successive stages termed leptotene , zygotene , pachytene , diplotene , and diakinesis .

发现这三种植物在第一次减数分裂的终变期中都出现染色体的次级配对现象，中期都出现多极分裂现象；

And that the secondary pairing of chromosomes during diakinesis and the multipolar division beginning from metaphase I were evident .

我们的结果表明，中期Ⅰ染色体轴是在晚双线期到终变期的过程中逐渐在染色体中形成的。

Our results indicate that the metaphase I chromatid core is gradually formed during the period from late-diplotene to diakinesis .

花粉母细胞减数分裂正常，在终变期和中期Ⅰ观察到9个二价体，未观察到染色体结构变异和行为异常。

Bivalents had been observed during diakinesis and metaphase I. No abnormal phenomena such as chromosome bridges and lagging were observed .

结果表明：（1）减数分裂Ⅰ终变期染色体标本是进行染色体显微操作的理想材料；

The hybridization results show that : ( 1 ) Chromosome specimen of meiosis ⅰ diakinesis is the ideal material for single chromosome microisolation ;

合适的处理时期为前期I的双线期至终变期，巨大花粉比例可达40.6%；

The best doubling effect could be obtained during the period from the diplotene stage to the diakinesis stage , and the highest proportion was up to 40.6 % ;

在小孢子母细胞减数分裂过程中，有核糖体数量存在逐渐减少的现象，质体和线粒体结构在双线期/终变期和中期趋于简化；

A dedifferentiation of mitochondria and plastids in structure in microspore mother cells was observed at from diplonema / diakinesis to metaphase ⅰ, then a redifferentiation at dyad stage .

对花粉母细胞在减数分裂中染色体行为和终变期二价体交叉点的频率，以及亲和性程度等进行了分析。

The analysis of chromosome behavior in miosis and frequency of bivalent chiasma at diakinesis of pollen mother cells of F1 hybrid plants , and the affinity extent were reported in this paper .