野生宝兴杜鹃重瓣花的发现及其形成机制探讨

Discovery and Discussion of the Formation Mechanisms of Wild Double Flowers of Rhododendron moupinense

宝兴杜鹃重瓣花发现于四川省汶川县三江乡境内,与同生境的宝兴杜鹃非重瓣花相比,具有以下不同特征:花的外观类似于茶花,雄蕊多数无定数,花丝中下部瓣化成花瓣状,基部有白色柔毛,未见雌蕊。对重瓣花形成机制进行分析,推测重瓣宝兴杜鹃形成的原因为:与花器官发育相关的基因的突变或异常表达,其中,C类和B类基因可能起主要作用。

Double flowers of Rhododendron moupinense were found in Sanjiang Township,Wenchuan County,Sichuan Province.Compared with the non-double flowers of Rhododendron moupinense in the same habitat,there were some different characteristics:the appearance of the flower was similar to that of camellia,the stamens were numerous and without a fixed number,the lower parts of the filaments changed into petaloid structures and with white pubescent,the pistils were degenerated.According to the analysis of the formation mechanism of double flowers,it is speculated that the reasons for the formation of double flowers of Rhododendron moupinense could be the mutation or abnormal expression of genes related to the development of flower organs,among which the C class of MAD-box genes and B class of MAD-box genes may play the major role.