Abstract
Cucumis hystrix Chakr. (HH, 2n=24), a wild relative of the cultivated cucumber, possesses several potentially valuable disease-resistance and abiotic stress-tolerance traits for cucumber (C. sativus L., CC, 2n=14) improvement. Numerous attempts have been made to transfer desirable traits since the successful interspecific hybridization between C. hystrix and C. sativus, one of which resulted in the production of an allotriploid (HCC, 2n=26: one genome of C. hystrix and two of C. sativus). When this genotype was treated with colchicine to induce polyploidy, two monosomic alien addition lines (MAALs) (plant nos. 87 and 517: 14 CC+1 H, 2n=15) were recovered among 252 viable plants. Each of these plants was morphologically distinct from allotriploids and cultivated cucumbers. Cytogenetic and molecular marker analyses were performed to confirm the genetic constitution and further characterize these two MAALs. Chromosome counts made from at least 30 meristematic cells from each plant confirmed 15 nuclear chromosomes. In pollen mother cells of plant nos. 87 and 517, seven bivalents and one univalent were observed at diakinesis and metaphase I; the frequency of trivalent formation was low (about 4–5%). At anaphase I and II, stochastic and asymmetric division led to the formation of two gamete classes: n=7 and n=8; however, pollen fertility was relatively high. Pollen stainability in plant no. 87 was 86.7% and in plant no. 517 was 93.2%. Random amplified polymorphic DNA analysis was performed using 100 random 10-base primers. Genotypes obtained with eight primers (A-9, A-11, AH-13, AI-19, AJ-18, AJ-20, E-19, and N-20) showed a band common to the two MAAL plants and C. hystrix that was absent in C. sativus, confirming that the alien chromosomes present in the MAALs were derived from C. hystrix. Morphological differences and differences in banding patterns were also observed between plant nos. 87 and 517 after amplification with primers AI-5, AJ-13, N-12, and N-20, suggesting that these plants may contain different C. hystrix chromosomes.
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Acknowledgements
This research was partially supported by General Program No. 30170644 from the National Natural Science Foundation of China, by the Department of Education of China (program no. 01097), by National Hi-Tech R and D Program Nos. 2001AA241123 and 2002AA241251, and by Trans-Century Training Program Foundation for the Talents by the State Education Commission, China. Additional support was provided to Dr. Jin-Feng Chen, recipient of the Cornell-China Scholar Award from the Tang Family’s generous gift to Cornell University. Our sincere thanks go to Dr. Hu-Qu Zhai, the President of Chinese Academy of Agricultural Sciences, for his support and to Dr. Hilde Nybom of the Department of Crop Science, Swedish University of Agricultural Sciences for critical review of the manuscript.
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Chen, JF., Luo, XD., Qian, CT. et al. Cucumis monosomic alien addition lines: morphological, cytological, and genotypic analyses. Theor Appl Genet 108, 1343–1348 (2004). https://doi.org/10.1007/s00122-003-1546-z
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DOI: https://doi.org/10.1007/s00122-003-1546-z