Stochastic variation in Cardamine hirsuta petal number

Petal number is a robust trait in flowering plants. Crucifer flowers have four petals but Monniaux et al. show that petal number varies from zero to four in Cardamine hirsuta.

Cardamine hirsuta
Cardamine hirsuta. Photo: MrClementi / Flickr

They mapped quantitative trait loci controlling stochastic variation in petal number and found that both the mean and uniformity of this trait share a common genetic basis. They suggest that this genetic variation, which is available to alter the mean and variance of petal number in C. hirsuta, may be cryptic in species such as Arabidopsis thaliana with robust petal number.

Written by Annals of Botany Office

The Annals of Botany Office is based at the University of Oxford.

Iris lutescens

Spatial distribution of genetic variation in the flower colour polymorphic Iris lutescens

Inflorescence of a member of Calyceraceae showing an ant crawling among the florets.

Origin of the bifurcating style in Asteraceae