Browsing by Author "Monoranjan Ghose"

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    Leaf Epidermal Characteristics of Some Tall and Dwarf Cultivars of Coconut, Cocos Nucifera L. in the Sundarbans Area of West Bengal
    (1996) Monoranjan Ghose; Kaushik Bhattacharya
    Results of a comparative study on the leaf epidermis of five tall and three dwarf cultivars of coconut, Cocos nucifera are reported. The mature stomata are of tetracytic type. The stomatal frequency and length of guard cells vary significantly (P< 0.05) among cultivars. The highest frequency of stomata per unit area and the largest guard cells occur in dwarf cultivars (Malayan dwarf yellow and Chowghat dwarf orange respectively). Other characteristics which vary significantly among the cultivars are -number of epidermal cells mm2 and the length of epidermal cells and trichomes. The number of trichomes per unit area however, remains more or less constant among both tall and dwarf cultivars. On the basis of epidermal characteristics, it may be concluded that epidermal characteristics of leaves, particularly stomatal frequency and stomatal index can be regarded as useful characters for identification and selection.
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    Stomata And Trichomes In Leaves Of Young And Adult Palms
    (1973) Monoranjan Ghose; Antony Davis, T.
    Results of a study on the leaf epidermis of young and adult plants of Areca catechu, Borassus flabellifer, Cocos nucifera, Elaeis guineensis, Hyphaene thebaica, Livistona chinensis, Phoenix sylvestris and Rhapis excelsa are reported. The distribution of stomata and trichomes per unit area on the abaxial and adaxial epidermes was estimated. Measurements were also made of guard cells, trichomes, and ordinary epidermal cells. The stomatal index was calculated for seven species. The stomata are totally absent on adaxial epidermis of Cocos nucifera and Rhapis excelsa, while in Areca catechu, Elaeis guineensis and Livistona chinensis they are sparsely distributed. In the rest (Borassus flabellifer, Hyphaene thebaica and Phoenix sylvestris) stomata are equally common on the adaxial and abaxial surfaces. The frequency of the distribution of stomata is higher in adult palms. The lengths of guard cells on abaxial and adaxial surfaces (where present) do not differ significantly between young and adult palms. The number of rows of interstomatal cells is maximum in Elaeis guineensis which also shows the lowest stomatal index. The maximum width of such epidermal cells among young palms is in Areca catechu and, among adults, in A. catechu and Elaeis guineensis. Phoenix sylvestris (young as well as adult) bears the narrowest inter-stomatal cells. Trichomes are totally absent in Phoenix and Livistona, and absent on the adaxial epidermis in Cocos and Rhapis. Longest trichomes are in Hyphaene, and shortest in Elaeis.