Daily Archives: 22nd of June 2011

Gender segregation and sex allocation in pine

Gender segregation and sex allocation in pine

Gender segregation and sex allocation in pine

Many sex-ratio-related studies have focused on dioecious or monoecious herbaceous plants, but relatively few have looked at trees. Ne’eman et al. examine changes in gender segregation and sex allocation in Pinus halepensis. Young trees only produce female cones, which are mainly in the upper part of the crown, but both male and females are produced as the trees grow older and larger. Male cones are mostly on branches in the middle and lower parts of the crown and thus their pollen is thus likely to fall on the female cones of younger trees. Pinus halepensis is a short-lived tree whose regeneration is fire- or disturbance dependent, so pollination of young females is likely to enhance population spread.