Abstract:

With the highly heterozygous autotetraploid genetic background of potato cultures, directional breeding of a new potato variety is rather difficult. If, after the hybridization effect and the combining ability of potatoes are estimated, breeding of new potato varieties also has some rules to follow. The 93 crosses from the hybrid population of 15 potato parents planted in low-latitude plateau of Lijiang were analyzed. The results showed that the average irregular fruit rate (IFR) was 32.06% with 621 setting- flowers and 1937 pollinated flowers. There were 60 of 93 crosses to set fruits ; ‘Lishu6’, ‘GD2’, ‘Lishu7’, ‘Mira’, ‘NinglangA’ and ‘ZHXW’ were suitable as female parents, and ‘CIP004’, ‘CIP005’, ‘AWYY’, ‘GD1’ and ‘LSYY’ were suitable as male parents. ‘GD2’ and ‘Lishu7’ as male parents were no offspring, belonging to male sterility type. The flower setting percentage of ‘NinglangA’ as male parent was just 2%. The 19 crosses over 70% of the irregular-fruit-rate (IFR) are more from combinations of Yunnan potato landraces and CIP potato germplasms.