Abstract:

Variation of inflorescence traits in F₁ progeny populations derived from chrysanthemum (Dendranthema morifolium) cultivars ‘Yuhualuoying’ and ‘Aoyunhanxiao’ were investigated and the association between polymorphic SRAP markers and inflorescence traits was analyzed with One-Way ANOVA. The result showed that the 5 inflorescence traits segregated significantly in the F₁ population with coefficient of variation ranging from 15.32% to 49.70%, all fitting into a normal distribution. The association analysis between SRAP markers and inflorescence traits suggested that there were 10, 8, 4, 4 and 5 SRAP markers identified to be significantly related with flower diameter, number of ray florets, number of tubular florets, ray floret length and ray floret width, with the cumulative contribution ratio of 35.781%, 33.702%, 16.175%, 15.018% and 20%, respectively. However, the contribution ratio of each single genetic marker was relatively low, varying from 2.815% to 5.882%, which revealed that these markers were polygene with small effect. We anticipate that the proper utilization of these SRAP markers with relatively large contribution ratio, such as Me4Em1-3, Me4Em9-4, Me12Em3-1 and Me12Em16-5, in future gene-cloning studies would effectively improve molecular breeding program for inflorescence traits in chrysanthemum.

Key words: chrysanthemum(Dendranthema morifolium), inflorescence traits, SRAP, association analysis, one-way ANOVA analysis