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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2015, 36 (5)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Pollination ecology and reproductive biology of Canarium strictum Roxb. from evergreen forests of Central Western Ghats, India


C.N. Prasanna Kumar, R.K. Somashekar*, B.C. Nagaraja and D. Shivaprasad

Department of Environmental Science, Bangalore University, Bangalore 560 056, India

*Corresponding Author E-mail:



Publication Data

Paper received:

30 May 2014


Revised received:

29 September 2014


Re-revised received:

03 December 2014



08 December 2014



Pollination and reproductive biology of a dioecious tree Canarium strictum Roxb. (Burseraceae) was extensively studied within the Agumbe forest range of Western Ghats, Karnataka to identify primary pollen vectors and to enumerate interrelationship with the pollinators. The study also investigated phenology, floral biology, pollen production, pollen viability, stigma receptivity and nectar production. Trees produced functionally unisexual flowers with white petals, organized densely on inflorescences. Staminate flowers produced high percentage of viable pollen and relatively abundant nectar (15.75 l) as a reward to the pollinators, while pistillate flowers produced only nectar (12 l). Successful fruit set with wind pollination was facilitated by synchronization of flowering male and female trees, long term receptivity of stigma in female flowers and extended lifespan of flowers. The highest mean percent of fruit set with hand cross-pollination (=91.06) suggests the influence of local male tree density, as well as, frequency and abundance of pollinator community on fruit set by open pollination.    



 Key words

Breeding systems, Dioecism, Heterostyly, Phenology



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