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| Genetic behavior of Triticum aestivum–Dasypyrum villosum translocation chromosomes T6V#4S·6DL and T6V#2S·6AL carrying powdery mildew resistance |
| LIU Chang, YE Xing-guo, WANG Mei-jiao, LI Shi-jin, LIN Zhi-shan |
| National Key Facility of Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China |
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Abstract T6V#2S·6AL and T6V#4S·6DL translocation chromosomes developed from the cross of wheat and different Dasypyrum villosum accessions have good powdery mildew (PM) resistance, but their pairing and pyramiding behavior remains unclear. Results in this study indicated that the pairing frequency rate of the two differently originated 6VS chromosomes in their F1 hybrid was 18.9% according to genomic in situ hybridization (GISH); the PM resistance plants in the F2 generation from the cross between T6V#4S·6DL translocation line Pm97033 and its PM susceptible wheat variety Wan7107 was fewer than expected. However, the ratio of the resistant vs. the susceptible plants of 15:1 in the F2 generation derived from the cross between the two translocation lines of T6V#2S·6AL and T6V#4S·6DL fitted well. Plants segregation ratio (homozygous:heterozygous:lacking) revealed by molecular marker for T6V#4S·6DL or T6V#2S·6AL in their F2 populations fitted the expected values of 1:2:1 well, inferring that the pairing of the two alien chromosome arms facilitates the transmission of T6V#4S·6DL from the F1 to the F2 generation. A quadrivalent was also observed in 21% of pollen mother cells (PMCs) of homozygote plants containing the two pairs of translocated chromosomes. The chromosome pairing between 6V#2S and 6V#4S indicates that it will be possible to obtain recombinants and clarify if the PM resistance determinant on one alien chromosome arm is different from that on the other.
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Received: 28 September 2016
Accepted:
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| Fund: This research was financially supported by the National Key Research and Development Program, China (2016YFD0102000) and the Agricultural Science and Technology Innovation Program (ASTIP) of the CAAS. |
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Corresponding Authors:
Correspondence YE Xing-guo, Tel: +86-10-82109765, E-mail: yexingguo@caas.cn; LIN Zhi-shan, E-mail: linzhishan@caas.cn
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Cite this article:
LIU Chang, YE Xing-guo, WANG Mei-jiao, LI Shi-jin, LIN Zhi-shan.
2017.
Genetic behavior of Triticum aestivum–Dasypyrum villosum translocation chromosomes T6V#4S·6DL and T6V#2S·6AL carrying powdery mildew resistance. Journal of Integrative Agriculture, 16(10): 2136-2144.
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