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5 documents found tagged phenology [X]
  • Title
    Notes on Magnolia punduana Hk. F. & Th. (Magnoliopsida: Magnoliales: Magnoliaceae): an endemic and threatened tree species of northeastern India
    Type
    Journal Article
    Description
    Abstract: Magnolia punduana Hk. f & Th. belonging to family Magnoliaceae, is an important tree species endemic to Meghalaya, northeast India. This paper provides information on the distribution of the species in the state with special reference to its phenology. The result of the study reveals that habitat destruction and exploitation for timber are the major threats faced by the species. A few effective strategies for the conservation of the taxa have been suggested.
    Attribution
    Iralu Viheno, Upadhaya Krishna (2015). Journal of Threatened Taxa 9(7) pp. 7573-7576; doi:10.11609/jott.2183.7573-7576
  • Title
    The lonely endemic Palni Hills Rudraksha Tree Elaeocarpus blascoi Weibel (Magnoliopsida: Malvales: Elaeocarpaceae), Tamil Nadu, India
    Type
    Journal Article
    Description
    The study on exploration, phenology, floral morphology and seed biology of little known endemic species Elaeocarpus blascoi Weible were conducted in the forest areas of Palni hills. This study confirmed that only three individual existing in the wild; one mature individual available in the wild, whereas the other two individuals are under the conservation of NGO. The considerable percentage of tender shoots, flowers and fruits were infested by unidentified insects (aphids/ticks). The seed germination percentage in the natural habitat is very poor. The distribution and survival of species in the wild is questionable. The threat status of the species needs to be reassessed and updated as Endangered in the IUCN list and effective strategies to be developed to protect the species from further extinction.
    Attribution
    Irudhayaraj Dhanaraj Felix, Ramasubbu Raju (2014). Journal of Threatened Taxa 11(6) pp. 6473-6476; doi:10.11609/jott.1622.6473-6476
  • Title
    Floral phenology, secondary pollen presentation and pollination mechanism in Inula racemosa (Angiosperms: Asteraceae)
    Type
    Journal Article
    Description
    Inula racemosa Hook. f. is protandrous, discharges pollen grains inside the anther tube and presents pollen secondarily onto the sweeping hairs of the style. The style and stigmatic branches present the yellow clumped pollen grains for pollination. This study describes floral functional morphology and phenology, anther dehiscence and pollen presentation, growth and behaviour of style during anthesis and pollination mechanism of I. racemosa. The species is entomophilous and is characterized by a highly asynchronous sexual phase. A large degree of asynchrony from floret to floret in a capitulum, and capitulum to capitulum in a plant, keeps the pollen dispersed for a longer duration. Two insect families were represented in the pollinator survey: Hymenoptera and Diptera. A significant correlation was observed between the number of capitula visited per bout and foraging time. We discuss morphological features of the ?owers which may enhance the pollen removal rate per bee visit and consequently cause a high visitation and pollination rate.
    Attribution
    Shabir P.A., Nawchoo I.A., Wani A.A. (2013). Journal of Threatened Taxa 10(5) pp. 4498-4503; doi:10.11609/JoTT.o3320.4498-503
  • Title
    Pollination biology of Impatiens cuspidate Wight and Arn. (Balsaminaceae), a rare and endemic balsam of the Western Ghats, India
    Type
    Journal Article
    Description
    The pollination biology of Impatiens cuspidata, a rare and endemic balsam from the Western Ghats, has been studied with special reference to phenology, pollination, pollen-pistil interactions, breeding experiments and stigma receptivity. It flowers at night between 2330 and 0430 hr; flowering days extend up to 160 days in a year. The anther dehisced one day before anthesis, which confirmed the protandrous condition of the flower. Pollen-ovule ratio was calculated as 1729:1. Hawk moths, honeybees, flies and butterflies are the major pollinators of Impatiens cuspidata. Pollen grains are oval, having an average diameter of 28.24μm. Pollen viability by FCR test confirmed that 82% pollen grains are viable on the day of anthesis. Best pollen germination along with 1636μm tube development was achieved in Brewbakers medium. Stigma was more receptive (up to 80%) on the first day of flower opening. It chiefly reproduced by means of cross pollination, where the fruit set was only 40%, but artificial cross-pollination through xenogamy enhanced fruit set up to 80%. The plant is an obligate out-crosser and self incompatible, as confirmed by various hand pollination experiments. Seed germination in natural and controlled conditions was only 20%. Its dependence on a specialized habitat, bottlenecks in sexual reproduction, low percentage of seed germination and other abiotic factors could be reasons for its limited distribution and endemism.
    Attribution
    Sreekala A.K., Pandurangan A.G., Ramasubbu R., Kulloli S.K. (2011). Journal of Threatened Taxa 6(3) pp. 1818-1825; doi:10.11609/JoTT.o2385.1818-25
  • Title
    Phenology of horticulture fruit tree species and agroforestry tree species
    Type
    Proposal
    Description
    Open Science and Open Data: How to Do It in ICAR/NARS? To attempt this, we are proposing a project one phenology of horticulture fruit tree species and agroforestry tree species. This proposed project would be a Pan India project with people from ICAR/NARS institutes and other institutes. And would intended to study the phenology of trees under changing climate and develop database with location specific datasets for public access under CC-BY. You may see the project in development at the link https://goo.gl/KsQPTz. To participate please contact me at gutam2000@gmail.com