Correlation and combining ability of plant height and characters related to flowering of F1 hybrids by diallel cross in Petunia hybrida.

摘要

Correlation and combining abilities of plant height, stem diameter, internode length, flower length and number of flowers were studied from 15 F1 crosses made from the partial six-parent diallel crosses in P. hybrida. The plant height showed highlypositive correlations with stem diameter, internode length and number of flowers. The mean squares of general combining ability (GCA) and specific combining ability (SCA) were highly significant for all growth and flowering characters. Variance componentvalues of SCA were greater than the values of GCA for all characters, showing preponderance of non-additive gene actions for these characters. The lines of G and C for plant height and A, D, and G for number of flowers showed relatively high GCA effects. Crosses of E x G, A x G, and D x E exhibited high SCA effects on plant height, stem diameter, internode length, peduncle length and number of flowers. The broad sense heritability was generally high compared with the narrow sense one. Plant height andpeduncle length showed high broad and narrow sense heritability.