Genetic Stability of Rice Aneuploid During Its Asexual Propagation

Q3 Agricultural and Biological Sciences
Zhi-Yun GONG, Guo-Xin SHI, Xiu-Xiu LIU, Chuan-Deng YI, Ming-Hong GU, Heng-Xiu YU
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Abstract

For undertanding the genetic stability of rice (Oryza sativa L.) aneuploid during its asexual propagation, a telotetrasome (2n+·8S+·8S) was selected from the progenies of a rice telotrisome (2n+·8S), and preserved by asexual reproduction. One of the extra short arms (·8S) was easily lost in the asexual propagation offspring of 2n+·8S+·8S, resulting in morphological variation. The behaviors of the 2 extra ·8S were observed using fluorescence in situ hybridization (FISH) technique. One of the 2 extra ·8S was found without detectable centromeric satellite repeat (CentO) and centromere-specific retrotransposon (CRR), and failed to be transmitted stably; whereas the other extra ·8S contained CRR but no detectable CentO, which could be transmitted stably during asexual propagation. However, the extra ·8S contained both CentO and CRR sequences in the initial telotrisomic line (2n+·8S). Therefore, the CentO and CRR sequences of the extra ·8S may be randomly lost during asexual propagation, which results in instable inheritance in aneuploid rice with extra ·8S.

水稻非整倍体无性繁殖的遗传稳定性
为了解水稻(Oryza sativa L.)非整倍体在无性繁殖过程中的遗传稳定性,从一个水稻端粒体(2n+·8S)的后代中选择一个端粒体(2n+·8S+·8S),并通过无性繁殖保存下来。在2n+·8S+·8S的无性繁殖后代中,容易丢失一条额外的短臂(·8S),导致形态变异。用荧光原位杂交(FISH)技术观察了2 extra·8S的行为。2个额外的·8S中有1个没有检测到着丝粒卫星重复序列(CentO)和着丝粒特异性反转录转座子(CRR),未能稳定传播;而其他额外的·8S含有CRR,但没有检测到CentO,在无性繁殖过程中可以稳定传播。然而,额外的·8S在初始端三体系(2n+·8S)中同时含有CentO和CRR序列。因此,额外·8S的CentO和CRR序列可能在无性繁殖过程中随机丢失,导致额外·8S的非整倍体水稻遗传不稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.50
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