KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Mapping of RFLP Markers Linked to Bacterial Blight Resistant Genes (Xa-1, Xa-3) in Rice

벼 흰잎마름병 저항성 유전자(Xa-1, Xa-3)연관 RFLP 마커 탐색

  • Published : 2003.12.01
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Abstract

Bacterial blight caused by Xantomonas oryzae pv. oryzae is one of the most serious diseases of rice especially in southern area of Korea. Three races, $\textrm{K}_1$, $\textrm{K}_2$ and $\textrm{K}_3$, are the most dominant species. lo improve rice breeding efficiency using marker assisted selection, some RFLP markers were surveyed for polymorphism between resistant and susceptible to $\textrm{K}_1$ and $\textrm{K}_3$. And, 127 doubled-haploid (DH) lines derived from Milyang121/HRl1650-1-4-2 and 131 DH lines derived from Milyang123/HR10624-AC5 were evaluated to bacterial blight ($\textrm{K}_1$ and $\textrm{K}_3$). Milyang121 and HR10624-AC5 have Xa-1, resistant to $\textrm{K}_1$ race, and Milyang123 has Xa-3, resistant to $\textrm{K}_1$ and $\textrm{K}_3$ race. Three markers, RZ590, RZ536 and RG303, showing polymorphism between parents and resistance gene, Xa-1 and Xa-3, were analysed in the two combinations of DH lines. The segregation pattern of resistant DH population of Milyang123/HR10624-AC5 to susceptible showed 3:1 and 1:1 in $\textrm{K}_1$ and $\textrm{K}_3$ race. In three RFLP markers, RZ590 was linked to Xa-1 on chromosome 4, and RZ536 and RG303 were linked to Xa-3 on chromosome 11. The map distance between Xa-1 and RZ590 was 3.1cM on chromosome 4, and Xa-3 and RZ536/RG303 were 7.6/16.0cM on chromosome 11, respectively. The results of RFLP mapping will be useful for the selection and pyramiding of bacterial blight resistant genes.

우리나라 자포니카 품종의 흰잎마름병 저항성 유전자와 연관된 마커를 탐색하기 위하여, 밀양121호, 밀양123호 및 HB10624-AC5 등을 교배친으로 한 두 조합의 약배양 계통을 재료로 흰잎마름병 저항성 유전자(Xa-1 and Xa-3)와 DNA 마커간의 연관분석을 통하여 유전자 지도를 작성하고자 수행하였던 결과를 요약하면 다음과 같다. 1. $\textrm{K}_1$ 균주에 대한 흰잎마름병 저항성 검정결과, 밀양121호/HRl1650-1-4-2에서는 저항성과 감수성이 1:1로 분리하였으며, 밀양123호/HR10624-AC5 조합의 $\textrm{K}_1$ 및 $\textrm{K}_3$ 균주에 대한 검정결과는 각각 3:1과 1:1로 분리하여 이론치에 합당하였다. 2. 교배친에 대하여 DraI. HindIII, EcoRI, EcoRV, PstI등 5가지 제한효소에 대한 다형현상을 검정한 결과, RZ590, RG303, RZ536 등 3개의 마커가 다형현상을 나타내었다. 3. 흰잎마름병 포장저항성 검정결과와 RFLP 마커와의 연관분석 결과 Xa-1 유전자는 RZ590과 4번 염색체 상에서 3.1$\times$1.5 cM으로 연관되어 있었으며, Xa-3 유전자는 Rz536 및 RG303과 11번 염색체 상에서 각각 7.6$\times$2.3 및 16.0$\times$3.2 cM으로 연관되어 있었다. 4. 11번 염색체 상에서 Xa-3와 Rz536 및 RG303은 "Xa-3-RZ536-RG303" 순으로 위치하였다.순으로 위치하였다.

Keywords

References

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