Browsing by Author "Antony Davis, T."

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    Role of Pressure in Xylem Transport of Coconut and Other Palms
    (1973) John A. Milburn; Antony Davis, T.
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    Role of pressure in Xylem transport of coconut and other palms
    (1973) John A. Milburn; Antony Davis, T.
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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.