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Wang L.,Northeast Forestry University | Wang L.,Crop Breeding Institute of Heilongjiang Academy of Agricultural science | Jiao S.,Crop Breeding Institute of Heilongjiang Academy of Agricultural science | Jiang Y.,Crop Breeding Institute of Heilongjiang Academy of Agricultural science | And 5 more authors.
Field Crops Research | Year: 2013

Agronomical traits and SSR markers were used to analyze genetic diversity of 142 parent lines of sweet sorghum. Parent lines were clustered into 5 groups based on agronomical traits and each group is characterized by morphological traits and main origins. 41 selected SSR markers were used to analyze the parent lines. The genetic distance (GD) of the parent lines ranged from 0.558 to 0.858, averaging 0.640. The average specific index of parent lines was 189.0, which ranged from 109.1 to 454.7. According to SSR markers, parent lines were clustered into 7 groups but the agronomical traits of which were not significantly different between each group, and clusters based on SSR markers did not coincide with the analysis results based on agronomical traits. Cluster analysis was failed to distinctly group restorer lines and maintainer lines by both agronomical traits and SSR markers. Parent lines should be selected both with different agronomical traits and distant genetic distance for higher heterosis. Groups clustered by agronomical traits and molecular markers should be taken into account simultaneously in hybrid breeding. Information of this study can be used to select parent lines for development of segregating populations and hybrid breeding of sweet sorghum. © 2013 Elsevier B.V.


Liu G.,Nanjing Agricultural University | Liu G.,Crop Breeding Institute of Heilongjiang Academy of Agricultural science | Xing H.,Nanjing Agricultural University | Diao Y.,Crop Breeding Institute of Heilongjiang Academy of Agricultural science | And 5 more authors.
Crop Science | Year: 2014

The soybean aphid (Aphis glycines Matsumura) causes agricultural losses worldwide. Identifying sources of soybean resistance to the soybean aphid is a key strategy in preventing crop damage caused by this pest. Three hundred accessions of cultivated soybean [Glycine max (L.) Merr.] and two hundred accessions of wild soybean (G. soja) originally from northeastern China were evaluated in 2011 and 2012. The objectives of this study were to identify sources and types of resistance to the soybean aphid in early-maturing soybean germplasm. First, two preliminary choice tests were performed. Accessions that had been identified as aphid resistant in the two choice tests were simultaneously re-evaluated in a pot choice test, pot no-choice test, and field no-choice test to determine the type of resistance. The results of all tests showed that 4 of the 500 accessions were resistant to the soybean aphid. The results of a confirmation test indicated that the logarithmic value and the damage index 25 d after inoculation of accessions ZDD0326, ZDD0219, ZYD00022, and ZYD00033 were significantly (P < 0.05) different from those of susceptible checks in the pot choice test. Accessions ZDD0219, ZYD00022, and ZYD00033 had significantly lower logarithmic values and significantly lower damage index (DI) values than the susceptible checks in the pot and field no-choice tests (P < 0.05). Evidence indicated that ZDD0219, ZYD00022, and ZYD00033 have antibiotic resistance, and ZDD0326 has antixenosis resistance. © Crop Science Society of America.

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