on the reproductive strategies of sapota (Manilkara zapota)
Kishore*, D. Samant, H.S. Singh and S. Behera
Horticultural Experiment Station (ICAR-Indian Institute of Horticultural
Research), Aiginia, Bhubaneswar?751 019, India
Author E-mail: email@example.com
received : 06.02.2016
received : 09.07.2016
Accepted : 06.10.2016
Aim: M. zapota is inadequately
known with respect to its reproductive strategy and functional specialization
which are crucial aspects in determining its reproductive success. The
present investigation was conducted to study the role of floral traits in
pollinator recruitment, pollinators' involvement in selection of floral
traits and strategies of plants to ensure pollination services.
trees of sapota (var. Kalipatti) were taken as an experimental material.
Floral characters like floral morphology, anthesis, pollen dehiscence, stigma
receptivity, pollen production were studied by tagging twenty flowering
branches distributed across ten plants. Pollination efficiency was also
studied. The relation between parameters was worked out through simple linear
were characterized by small aperture, floral chamber, long spell of stigma
receptivity (48 hrs), imperceptible nectar secretion, high pollen ovule ratio
(980:1) and self-compatibility. The peak stigma receptivity was between 07:00
? 10:00 hr on the day of anthesis. On the basis of visitation rate
(3.0-5.5/flower) and pollination efficiency (13.85 ? 17.87%) thrips were
considered as primary pollinators and Silvanopsis sp. (beetle) as a
co-pollinator. Presence of narrow aperture, floral chamber and imperceptible
secretion of nectar make the flowers of sapota functionally specialized.
traits like narrow flower aperture played a crucial role in filtering specific
visitors (thrips and beetle) to access floral rewards. Moreover, the
morphological adaptation like floral chamber facilitated better pollen
services by providing shelter and breeding place for pollinators.
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