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2 documents found tagged self-incompatibility [X]
  • Title
    Reproductive ecology of Syzygium alternifolium (Myrtaceae), an endemic and endangered tropical tree species in the southern Eastern Ghats of India
    Type
    Journal Article
    Description
    Syzygium alternifolium is a semi-evergreen mass-flowering tree species of dry deciduous forest in the southern Eastern Ghats of India. It is a mass bloomer with flowering during dry season. The floral traits suggest a mixed pollination syndrome involving entomophily and anemophily together called as ambophily. Further, the floral traits suggest generalist pollination system adapted for a guild of pollinating insects. The plant is self-incompatible and obligate out-crosser. The flowers are many-ovuled but only a single ovule forms seed and hence, fruit and seed set rates are the same. Natural fruit set stands at 11%. Bud infestation by a moth, flower predation by the beetle, Popillia impressipyga and bud and flower mounds significantly limit fruit set rate. The ability of the plant to repopulate itself is limited by the collection of fruits by locals due to their edible nature, short viability of seeds, high seedling mortality due to water stress, nutrient deficiency and erratic rainfall or interval of drought within the rainy season. Therefore, S. alternifolium is struggling to populate itself under various intrinsic and extrinsic factors. Further studies should focus on how to assist the plant to increase its population size in its natural area taking into account the information provided in this paper.
    Attribution
    Raju A.J.S., Krishna J.R., Chandra P.H. (2014). Journal of Threatened Taxa 9(6) pp. 6153-6171; doi:10.11609/JoTT.o3768.6153-71
  • Title
    Reproductive ecology of Shorea roxburghii G. Don (Dipterocarpaceae), an Endangered semievergreen species tree of peninsular India
    Type
    Journal Article
    Description
    Shorea roxburghii is an Endangered semievergreen tree species restricted to peninsular India in the Eastern Ghats. Leaf shedding and leaf flushing are annual events while flowering is not annual, but when it does flower, in March, it shows massive blooming. Massive blooming, drooping inflorescence with pendulous flowers, ample pollen production, gradual pollen release as a function of anther appendage and aerodynamic pollen grains - all suggest anemophily. The characteristics of nectar secretion, hexose-rich sugars and amino acids in nectar are additional adaptations for entomophily. The plant is functionally self-incompatible, obligately outcrossing and ambophilous. The natural fruit set does not exceed 15% despite the plant being ambophilous. Scarabaeid beetle by causing flower damage and bruchid beetle by using buds, flowers and fruits for breeding greatly affect fruit set rate and thus the success of sexual reproduction in this plant species is also affected. Seeds are non-dormant, the embryo is chlorophyllous while the fruits are on the plant. Healthy seeds germinate as soon as they reach the forest floor but their establishment is seemingly affected by resource constraints due to the rocky habitat. The study suggests that non-annual flowering, massive flowering for a short period, high bud/flower and fruit infestation rate, absence of seed dormancy and rocky habitat could attribute to the endangered status of S. roxburghii.
    Attribution
    Raju A.J.S., Ramana K.V., Chandra P.H. (2011). Journal of Threatened Taxa 9(3) pp. 2061-2070; doi:10.11609/JoTT.o2763.2061-70