Flower Visitor Interaction and Fruit Production of Grewia Asiatica L
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Int.J.Curr.Microbiol.App.Sci (2016) 5(1): 761-767 ISSN: 2319-7706 Volume 5 Number 1(2016) pp. 761-767 Journal homepage: http://www.ijcmas.com Original Research Article http://dx.doi.org/10.20546/ijcmas.2016.501.077 Flower Visitor Interaction and Fruit production of Grewia asiatica L. Krishnendu Dey, Subrata Mondal and Sudhendu Mandal* Department of Botany, Visva-Bharati, Santiniketan-731235, India *Corresponding author A B S T R A C T The present paper deals with the flower visitor interaction and fruit K e y w o r d s production of Grewia asiatica L. (phalsa) (Tiliaceae) which has great Flower-visitors, economic importance for the production of juice. It flowers from March to Pollen May and yield fruit from May to June. Flowers are yellow, bisexual, regular, production, nectariferous and with many anthers. Flowers generally open in the early Pollination, morning (7:00 hrs 8:30 hrs). Anther dehiscence takes places before flower Grewia asiatica opening. In average each flower produces 27,900 pollen grains. Different members of Hymenoptera, Lepidoptera, Diptera, Coleopter (Beetles), Article Info Mammals and Birds etc. were found to visit for their forage. During their visit their body parts get dusted with pollen grains and subsequently Accepted: 25 December 2015 transferred to the con-specific plants resulting in successful pollination. 70% Available Online: fruits formation wear observed in natural open condition and 20% fruits 10 January 2016 formation were found in netted condition. But in bagged condition no fruits formation were observed in this plant. Introduction In order to set fruits and seeds the male and productivity, stigma receptivity, flower female reproductive units must come visitor diversity and their foraging together that s why pollination is behaviour. Changes in any of these events prerequisite for the formation of fruits and may seriously hamper fruits production. seeds in plant. Pollination biology is a Thus lack of pollinators or bad weather may recently developed branch in the biological make pollen transfer difficult. So, the sciences and has attracted the attention of relationship between the flowers visitors is the scientists throughout the world, because one of the most critical parts of plant of its importance in understanding plant reproduction for the production of breeding system, floral evolution, foraging quantitatively and qualitatively improved theory and animal behaviour. The ultimate fruits and seeds. Successful reproductive fruit production depends upon a number of process leads to fruits setting through aspects, such as floral morphology, pollen successful pollination. For this pollen grains 761 Int.J.Curr.Microbiol.App.Sci (2016) 5(1): 761-767 have to be adequately transported to the Results and Discussion respective stigmas and pollen tubes have to be accomplished growth in pistil and As soon as flowers open different flower fertilize the ovules. The pollen grains are visitors like Apis dorsata, Apis cerena transported by different abiotic and biotic indica, Trigona sp., Ceratina sp., Amegilla agents. Flowering plants are pollinated by sp., Megachile sp., Halictus sp., Xylocopa animals, mainly by insects. Among these sp., Eumenes sp, ants, members of bees and butterflies are dominant. During Lepidoptera and Diptera, Squirrel and Bird their visit they carry large quantity of pollen etc were found to visit flower for collecting grains which in turn are deposited on the their food materials. The large group of exposed stigmas of flower and thus help in Hymenoptera comprises some of the most pollination. The production and the dispersal interesting, highly evolved, and of pollen grains have both biological and economically most important pollinating genetic implications for the quantity and insects. The role of bees has been genetic values of the fruits and seeds. recognized in pollination since early time (Free, 1970). Social bees like Apis sp., In conjunction with the efforts to observe Trigona sp., Ceratina sp., and solitary bees the pollinator community of crops and the like Xylocopa sp., Amegilla sp., are more dominant pollinators of crop production important ones. Apis spp. visit flower to experiments were performed to study the collect nectar and pollen. They are attracted floral morphology, pollen productivity, to flowers and recognize them by their flower visitor interaction and their foraging colour, shape and odour. Bees are able to behaviour in relation to pollination distinguish only four qualities of colour, mechanism of Grewia asiatica L. belonging yellow, blue-green, blue and ultra violet and to family Tiliaceae popularly known as when they are working flowers of one phalsa, one of the most important crop with colour only they become conditioned to it high economic returns. and do not visit flowers of a different colour, although the petals are the most conspicuous Materials and Method feature of an entomophilies flower (Free, 1970). Apis spp. condensed their visit to the The study was conducted flowing the yellow colour of Grewia flower. They process of Mathur and Mohan Ram (1986), forage the flowers throughout expose Reddi et al. (1980) to observe different surface of anthers and stigma. Stigma phenological events with the plants growing becomes sticky during this time. They pay in and around university campus at continuous visit and play a major and vital Santiniketan, Birbhum, West Bengal (87 41 role in pollination. The duration of forage is and 87 42 east longitude and between much more in the morning than noon and 23 40 and 23 42 north latitude). afternoon. Petals expansion, nectar secretion and scent production reach their maximum Pollen production was performed following to coincide with anther dehiscence so the the procedure of Mandal and Chanda nectar foragers pick up mature pollen on (1981). their bodies. The petals wither and scent and nectar production cease soon after a flower Netting by nylon mesh and bagging by is fertilized. In unpollinated flowers nectar butter paper are done for determination of secretion persists for longer than usual fruits set. (Free, 1970). The nectarines, or 762 Int.J.Curr.Microbiol.App.Sci (2016) 5(1): 761-767 nectariferous tissue, which secretes nectar, because usually they move very quickly may occur in many parts of the flower from flower to flower. Therefore, the including the receptacle, petals and sepals foraging activity of Amegilla sp. is and the bases of the filament and pistil. The important for pollination in this plant nectar secretion by some species is of very species. limited duration. Nectar secretion is influenced by the maturation of the stigma Different members of Lepidoptera push their and stamens, and also often by the age of the proboscis up to the base of ovary and flower and is usually greater on the first day, ultimately pollen grains are attached to their or first few days, a flower is open than later proboscis surface and transported to (Shuel, 1961).Different pollinators are pollinate the same flower as well as other attracted by the nectar and collect as food flowers. Ants collect both pollen and nectar materials. Honeybees possess special but their bodies are hard and apparently not modifications for packing pollen which is adapted for pollen transport. Ants crawling transported back to their colonies as pollen around throughout day and night in flowers pellets in the pollen baskets, or corbiculae, and inflorescences and may cause autogamy on their rear legs. The two pollen pellets or geitonogamy. Different members of collected by a bee during its foraging trip are Diptera are found to visit flowers for their referred to as pollen load. Xylocopa sp. May food material and help in pollination of the be considered as effective pollinator to this plant. Many small vegetarian vertebrates plant. They use buzz pollination techniques especially mammals like squirrels roam in for collecting pollen from the anther. The the crown of trees and eat blossoms or parts bees grab onto the flower and move their of blossoms or suck nectar. In many, flight muscles rapidly, causing the flower perhaps the majority of these cases the effect and anthers to vibrate, dislodging pollen. is destructive, though even a destructive This resonant vibration is called buzz feeder may more or less accidentally leave pollination. They need greater energy for some pollinated pistils. During their their existence because they are large sized movement their body get dusted with pollen insect. Xylocopa sp. suddenly comes and grains and help pollen transfer and lands on flower in upright position and pollination to the con-specific plants contact anthers and stigma with their resulting in successful pollination. As flying sternum, foreleg and backside of body. animals with a rough surface, birds possess Stigmas are about the anther level and good external prerequisites for becoming capitates. So the viable pollen grains pollinators. Whereas everybody apparently transported by these bees can easily be takes for granted the fact that various insects dropped over stigma of other flowers and find their food in blossoms, the eventually help in pollination. Trigona sp, corresponding habit of birds seems to have Ceratina sp. visit the flower for both pollen caused a great deal of astonishment and and nectar. They probe the flowers in the speculation about how birds got the idea of upright position; collect floral rewards utilizing the nectar of blossoms. Thus the efficiently in mess and soil manner and bird (Nectarinia sp.) also helps in carry pollen on the body. Amegilla sp. pollination of plant. Different flower visitors handles the flower in upright position and visit flower and play a major and important collect floral rewards sternotribically and role in pollen transfer and pollination of carries huge amount of pollen on its ventral Gewia asiatica L. side. These bees are very efficient pollinator 763 Int.J.Curr.Microbiol.App.Sci (2016) 5(1): 761-767 Table.1 Fruits Production of Grewia asiatica L. Name of plant Bagging condition Netting condition Open condition Grewia asiatica Nil 20% 70% Table.2 List of Flower Visitors of Grewia asiatica L.