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首页> 外文期刊>Folia geobotanica >Impaired Male Meiosis due to Irregular Synapsis Coupled with Cytomixis in a New Diploid Cytotype of Dianthus angulatus (Caryophyllaceae) from Indian Cold Deserts
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Impaired Male Meiosis due to Irregular Synapsis Coupled with Cytomixis in a New Diploid Cytotype of Dianthus angulatus (Caryophyllaceae) from Indian Cold Deserts

机译：印度冷沙漠中石竹新二倍体细胞型中突触结合不规则突触引起的男性减数分裂受损。

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Dianthus angulatus (Caryophyllaceae) is cytologically examined here for the first time for the area of India. The diploid chromosome count of 2n = 30, ascertained here, represents a new cytotype, supplementing the earlier report of a hexaploid cytotype with 2n = 90 from outside of India. We report here the occurrence of two plants showing impaired meiosis due to irregular synapsis and cytomixis collected from Kinnaur district, Himachal Pradesh (India). The other plants of this species collected in Lahaul-Spiti region showed normal male meiosis (n = 15) with a high (95%-100%) pollen fertility and normal seed set, and they reproduce sexually. Irregular synapsis in two plants from the Kinnaur region is characterized by the complete absence of chromosome pairing and the presence of 30 univalents at diakinesis and meta-anaphase. In addition, other meiotic irregularities were found, such as unoriented chromosomes, laggards, precocious movements of univalents at anaphase-I and micronuclei at telophase. Microsporogenesis was also abnormal, resulting in the formation of monads, dyads, triads, polyads, and tetrads with micronuclei. The occurrence of intra- and intermicrosporal chromatin material transfer during microsporogenesis was observed, which is a rather rarely observed phenomenon. The synaptic irregularities coupled with chromatin transfer in these plants seem to be responsible for the high pollen sterility (38%-42%) and heterogeneously sized pollen grains. In these plants no seeds were set, and plants reproduced vegetatively through root suckers.
机译：在这里，首次对印度石竹（石竹）进行了细胞学检查。在此确定的2n = 30的二倍体染色体数代表一种新的细胞型，补充了来自印度以外的2n = 90的六倍体细胞型的早期报道。我们在这里报告了由于不规则的突触和从印度喜马al尔邦Kinnaur区收集的细胞混合而出现减数分裂受损的两种植物的发生。在Lahaul-Spiti地区收集的该物种的其他植物显示出正常的雄性减数分裂（n = 15），具有高的花粉育性（95％-100％）和正常的结实，并且它们有性繁殖。来自Kinnaur地区的两株植物中不规则的突触的特征是完全没有染色体配对，并且在diakinesis和meta-anaphase存在30个单价。此外，还发现了其他减数分裂异常，例如未定向的染色体，落后，在后期I处单价的早熟运动和在末期的微核的早熟运动。小孢子发生也异常，导致形成具有微核的单核，双核，三联，多联和四联体。在微孢子发生过程中观察到了微孢子内和微孢子间染色质物质转移的发生，这种现象很少见。这些植物的突触不规则加上染色质转移似乎是造成高花粉不育（38％-42％）和花粉粒大小不均的原因。在这些植物中，没有种子结实，并且植物通过根吸盘无性繁殖。

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