Analysis of parental effects on mean vine maturity and chip colour of 4x.2x potato progenies

Abstract

The parental effects on progenies from potato 4x .2x(FDR) crosses were analyzed to determine whether and to what extent selection criteria used for selecting tetraploid breeding lines have to be adjusted when selecting diploid breeding lines. For vine maturity and chip colour multiple regression analysis of progeny means on means of diploid and tetraploid parents revealed high coefficients of determination (R2 ) for both characters, indicating good predicting power of the performance of both diploid and tetraploid parents on the performance of their 4x .2x progenies . For vine maturity the multiple regression slope for the tetraploid parents was significantly larger than for the diploid parents, and progeny means were towards the tetraploid parents . This indicates that selection criteria for vine maturity may be less stringent at the diploid level . However, diploids may be earlier maturing than tetraploids and therefore selection criteria can better be similar at both ploidy levels . For chip colour, multiple regression slopes for diploid and tetraploid parents were similar and progeny means were towards the darkest coloured parent irrespective of its ploidy level . This indicates that selection of breeding lines for chip colour can be conducted similarly at both ploidy levels . 175

Tuber yield and quality of 4x‐2x (FDR) potato progenies derived from the wild diploid species Solanum berthaultii and Solanum tarijense

“…The same trend was observed for GTA. Good predicting power based upon the 2x parent performance for HM has been reported in distinct sets of 4x)2x progenies evaluated in Europe (Hutten et al 1996). The present results indicated, however, that parental performance for HM might be dependent upon the set of clones used as parents as well as the environment employed for testing.…”