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- W910692208 abstract "Progenies derived from crosses between Solanum tuberosum and 2n pollen-Producing diploid hybrids,exhibit obvious hybrid vigor.The 2n pollen-producing clone can act as a bridge in crossing S.tuberosum and S.andigena with S.phureja.Populations from 4x-2x crosses show more unifomity and less segregation compared with that of 4x-4x crosses.The parent-offspring correlation for the traits ,starch content and tuber number,is significant at 0.01 level.The regrssion equations are Y(p-F1)=1.0+1.2x and Y(mp-F1)=5.3+0.8x.respectively.The 2n pollen-producing clones play an impotant role in increasing tuber stach conternt.Estimates of the combining ability for the main yield components indicate that additive effect prodominates for such trais as plot yield,tuber weight per plant and starch content whereas both additive and non-additive effects lay equal stress on mean tuber weight and non-additive effect is important for tuber number.In general,non-additive effect appears to be important in the progenies of 4x-2x crosses.Tuber number shows apparent heterosis while mean tuber weight dos not .Thus it is necessary for 2n pollen-prducing clones to be selected for high mean tuber weight and low tuber number before theiruse in commercial potato production.In the double cropping region of Anhui,the 4x-2x hybrids seem to be more adaptive than S.tuberosum×S.andigena hybrids,but the yield of 4x-2x cross is lower than that of the cross S.tuberosum×S.andigena in Harbin region.In Harbin region,the better combination type is in the from of S.andigena×(phureja-haploid Group tuberosum),and the best cross is also in the from.In Anhui ,the better combination type is S.tuberosum ×(phureja-haploid Group tuberosum),and the best cross is that using a variety of S.tuberosum as its parent,The progeny tubers of 4x-2x cross have a short dormant period and are suitable for the double cropping region。" @default.
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- W910692208 date "1996-01-01" @default.
- W910692208 modified "2023-09-23" @default.
- W910692208 title "Estimating Combining Ability of 4χ—2χ Crosses in Cultivated Potatoes" @default.
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