Impact of floral density on pollination success rate and fruit set of Calceolaria gracilis Kunth in Darjeeling Himalaya
DOI:
https://doi.org/10.19071/cb.2017.v8.3256Abstract
There are many populations in a 16 km east-west distribution and populations are usually small with fewer than 100 plants/clumps. The pollen biology in terms of pollen production, pollen-ovule ratio estimation, pollen viability and pollen fertility was studied to determine the impact of plant and flower density on pollen viability and fruit set of Calceolaria tripartita Ruiz &Pav. (Scrophulariaceae) in Darjeeling Himalaya. It is revealed that higher the density of the plants and flowers, the productivity of pollens and ovules and the viability and fertility of pollen grains become higher showing a positive correlation between plant-flower density vs. pollen biology. Fruit set is higher in high dense flowering site than low ones which might be due to higher pollen fertility rate, low sterility and greater number of pollen load upon stigma. Thus, it reflects that plant and flower density has a crucial role upon the reproductive fitness of this taxon.
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References
Bhattacharya A and Mandal S. Pollination, pollen germination and stigma receptivity in Moringa oleifera Lamk. Grana 2004; 43(1): 48-56.
Cruden RW. Pollen-ovule ratios: a conservative indicator of breeding systems in flowering plants. Evolution 1976; 31: 32-46.
Dietzsch AC, Stanley DA, Stout JC. Relative abundance of an invasive alien plant affects native pollination processes. Oecologia 2011; 167:469–479.
Faegri K and vander Pijl L. The principles of pollination ecology. 4th ed. Oxford: Pergamon Press Ltd.; 1981
Feldman TS, Morris WF, Wilson WG. When can two plant species facilitate each other's pollination? Oikos 2004; 105: 97– 207.
Ghazoul J. Floral diversity and the facilitation of pollination. Journal of Ecology 2006; 94: 295-304.
Greenleaf SS, Williams NM, Winfree R, Kremen C. Bee foraging ranges and their relationship to body size. Oecologia 2007; 153: 589-596.
Hanoteaux S, Tielbörger K, Seifan M. Effects of spatial patterns on the pollination success of a less attractive species. Oikos 2013; 122: 867–880.
Mathur G and Mohan Ram HY. Floral biology and pollination of Lantana camara Phytomorphology 1986; 36(1&2): 79-100.
Shivanna KR and Rangaswamy NS. Pollen Biology: A Laboratory Manual. 10th ed. Heidelberg: Springer-Verlag.;1992
Yang S, Ferrari MJ, Shea K. Pollinator behavior mediates negative interactions between two congeneric invasive plant species. American Naturalist 2011; 177: 110-118.
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