Department of Crop Physiology, University of Agricultural Sciences, GKVK Campus, Bangalore-560 065, India.
AGE-SPECIFIC SEX RATIO IN A MONOECIOUS SPECIES CROTON BONPLANDIANUM BAILL
Article first published online: 2 MAY 2006
Volume 97, Issue 3, pages 523–531, July 1984
How to Cite
UMA SHAANKER, R. and GANESHAIAH, K. N. (1984), AGE-SPECIFIC SEX RATIO IN A MONOECIOUS SPECIES CROTON BONPLANDIANUM BAILL. New Phytologist, 97: 523–531. doi: 10.1111/j.1469-8137.1984.tb03616.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- (Accepted 20 February 1984)
- Age-specific sex ratio;
- gametic success;
- sexual selection;
- pollen grains
The ratio of male to female flowers (sex ratio) in the monoecious Croton bonplandianum Baill decreased as plants aged in three habitats. Two major forces, male and female gametic success and intra-sexual selection, have been invoked to explain the decrease in sex ratio. While increasing female gametic success at successive stages of growth might be responsible for the enhanced allocation of resource to the females and hence for the absolute increase in number of female flowers at a later age, increasing male gametic success does not change the absolute number of male flowers but merely causes an increase in the number of pollen grains deposited on the stigma. Differences in the sex ratio between habitats was influenced by the differential fitness gained by the two sexes in the various habitats.