New form of China aster (Callistephus chinensis (L.) Nees). Structure and biology of ray florets with open tubular corollas (type RO)

Acta Agrobotanica

Alicja Wosińska¹ 

[1] Warsaw Agricultural University;

关键词: China aster;    postradiational variability;    ray florets;    disc florets;   

DOI  :  10.5586/aa.2001.029

来源: DOAJ

【 摘 要 】

A radiomutant of China aster with a new type of head and new type of ray florets was described. All florets in the head were bisexual and tubular although dimorphic - they varied in size and colour. The place of ray florets in the head was taken by bisexual open tubular florets which were often crowned with irregular teeth. Disc florets were short and parchment-like. In both types of florets the following were compared: number and size of stamens, vitality ofpollen and floret fertility. A number of teeth (lobes) in the corolIas of disc florets was also determined. Attention was also paid to the frequently observed anomalies and in particular to stamen displation. The problem is discussed of whether the obtained form resulted frommutation of disc florets with the simultaneous mutation of factors determining the so far unknown in China aster the head type without the whorl ofray florets or whether it was a mutation of ray flowers (corolla type and androecium formation). The author presents the opinion that the form resulted from the mutation ligulate of ray florets to the type offlorets described above.

【 授权许可】

Unknown