Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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Effect of Rye B chromosome on Meiotic Chromosome Association in Wheat (Triticum aestivum L.) Genetic Background

밀 유전 배경에서 호밀 B 염색체가 감수분열 염색체 접합에 미치는 영향

  • Cho, Seong-Woo (Department of Smart Agro-Industry, Gyeongsang National University)
  • 조성우 (경상국립대학교 스마트농산업학과)
  • Received : 2022.07.27
  • Accepted : 2022.08.27
  • Published : 2022.10.01
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Abstract

The effect of rye B chromosome (rye B) on chromosome association was investigated in meiosis of wheat addition line. The wheat addition line was with one Leymus mollis chromosome and one L. racemosus chromosome which are under homoeologous relationship. Chromosome behavior of the two Leymus chromosomes in wheat genetic background was revealed by genomic in situ hybridization. In the first metaphase, most of the two Leymus chromosomes showed univalent in the wheat addition line without rye B (98.1 ± 0.5%). On the other hand, the wheat addition line with rye B showed higher frequency of bivalent (10.3 ± 0.2%) than wheat addition line without rye B (1.9 ± 0.5%). The wheat addition line without rye B showed abnormal bivalents with abnormal structure while the wheat addition line with rye B showed normal bivalent in low frequency. By rye B, some bivalent was composed of wheat and L. racemosus, and some trivalent was composed of wheat bivalents with L. mollis chromosome. Also, some wheat bivalents showed hyper-crossover, so those wheat bivalents showed abnormal structure compared to other wheat bivalents with normal structure such as ring, rod, and pan.

이 연구에서는 밀 첨가 계통의 생식세포분열시, 호밀 B 염색체가 염색체 접합에 미치는 영향을 관찰하였다. 밀 첨가 계통은 동조관계에 있는 Leymus mollis와 L. racemosus 염색체를 각각 하나씩 가지고 있다. 밀의 유전적 배경에서 두 Leymus염색체의 이동은 genomic in situ hybridization에 의하여 확인되었다. 호밀 B 염색체를 가지고 있지 않은 밀 첨가 계통의 생식세포 제1중기 분열기에 두 Leymus 염색체의 대부분은 일가염색체를 보였다(98.1 ± 0.5%). 반면에 호밀 B 염색체를 가지고 있는 밀 첨가 계통에서 Leymus 이가염색체의 빈도(10.3 ± 0.2%)는 호밀 B 염색체를 가지고 있지 않은 밀 첨가 계통의 Leymus이가염색체의 빈도(1.9 ± 0.5%)보다 높았다. 호밀 B 염색체를 가지고 있지 않은 밀 첨가 계통에서는 비정상적인 구조를 가지고 있는 이가염색체가 관찰되었다. 반면, 비록 매우 낮은 빈도이지만 호밀 B 염색체를 가지고 있는 밀 첨가 계통에서는 정상적인 형태를 보이는 이가염색체가 확인되었다. 호밀 B 염색체의 영향은 또한 보통밀과 L. racemosus염색체 사이의 이가염색체의 형성을 유도하였으며, 보통밀과 L. mollis 염색체 사이의 삼가염색체의 형성도 유도하였다. 뿐만 아니라 보통밀 염색체 사이에서 초과 교차가 일어나는 것을 확인하였으며, 이러한 현상으로 원, 막대, 그리고 후라이팬 모양의 일반적인 이가염색체의 형태가 아닌 막대모양이나 응축된 형태의 보통밀 이가염색체가 확인되었다.

Keywords

References

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