Floral display and breeding system of Jatropha curcas L.
- 308 Downloads
Plant flowering and breeding characteristics are important for us to understand the reproduction of plant populations. In this paper, we studied the reproduction characteristics of Jatropha curcas in Yuanjiang County (23°36′N, 101°00′E), Yunnan Province. The plant produces flowers in dichasial inflorescences. Normally, the flowers are unisexual, and male and female flowers are produced in the same inflorescence. Only a few male flowers are produced in an inflorescence, and fruits are produced only through pollination between different flowers from the same or different plants. By the treatments of emasculation, bagging and artificial pollination in this experiment, there were few but same fruit set ratios when the inflorescences were emasculated, bagged, or bagged with net, except artificial pollination treatments, which showed that Jatropha curcas could produce fruit through apomixis but not wind pollination. When the inflorescences were unbagged, unemasculated and with free pollination treatments, or bagged, emasculated and with artificial cross-pollination treatments, or unbagged, emasculated and with free pollination treatments, there were many fruits produced. It showed that Jatropha curcas shows outcrossing, is self-compatible, and demanding for pollinators. Normally, the male flowers open first and a few flowers bloom in one day in a raceme. These flowers last a long time in bloom. However, a large number of female flowers open from the third to the fifth day, with some female flowers opening first in a few raceme. This shows a tendency to promote xenogamy and minimize geitonogamy.
Key wordsJatropha curcas floral display breeding system outcrossing index pollen-ovule ratio
Unable to display preview. Download preview PDF.
- Dafni A. 1992. Pollination Ecology. New York: Oxford University Press, 1–57Google Scholar
- Editorial Committee of Flora China Nica of the Academy of Sciences of China. 1996. Flora of China. Beijing: Science Press, 44(2): 148 (in Chinese)Google Scholar
- Faegri K, Pijl V D L. 1979. The Principles of Pollination Ecology. 3rd edn. Oxford: Pergamon Press, 151–154Google Scholar
- Fang Y M. 1996. Plant Reproductive Ecology. Jinan: Shandong University Press, 1–56, 120–163 (in Chinese)Google Scholar
- Grant V. 1981. Plant Speciation (2nd ed). New York: Columbia University PressGoogle Scholar
- Guo Y H. 1994. Pollination biology and plant evolution. In: Chen J K, Yang J (eds.), Plant Evolutionary Biology. Wuhan: Wuhan University Press, 232–280 (in Chinese)Google Scholar
- Liu X J, Ding M M, Zhang G X, Zhao L, Li R J. 1997. Studies on flower biology and breeding system of Vicia L. in Northeast China. Bull. Bot. Res., 17(4): 421–429 (in Chinese with an English abstract)Google Scholar
- Wyatt R. 1983. Pollinator plant interactions and the evolution of breeding systems. In: Real L (ed.), Pollination Biology. Florida: Academic Press, 51–95Google Scholar
- Zhang D Y, Jiang X H. 2001. Mating system evolution, resource allocation, and genetic diversity in plants. Acta Phytoecol. Sin., 25(2): 130–143 (in Chinese with an English abstract)Google Scholar