• Volume 80, Issue 4

      October 1974,   pages  163-196

    • Studies on respiration in relation to body size and oxygen tension in the pelecypodCongeria sallei recluz

      K Mangapathi Rao P Ramachandra Raju S S Ganti N Kalyanasundaram

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      Studies on respiration and metabolic rate in relation to body size have been carried out for an important fouling molluscCongeria sallei, Recluz. The oxygen consumption varied from 0·038 ml/hr to 0·804 ml/hr depending on the body size. The metabolic rate varied inC. sallei from 6·012 to 0·805 ml/gm/hr, the highest rate being obtained in the smallest animal. The respiration by the animals was found to be proportional to the power of 0·5845 of the body weight and the relation of surface area to metabolism has been thus indicated.

      The results on the effect of oxygen tension on the metabolic rate ofC. sallei showed that there was a gradual decrease in the metabolic rate with decrease in oxygen tension upto 2·5 ml/l. Below this level a sudden decline in the metabolic rate was observed. Correlation of results on oxygen tension with the variations observed in the oxygen level of the natural environment has been attempted.

    • Vegetative and reproductive shoot apex and root apex in someSaccharum species

      S K Pillai M N B Nair S Bhambie

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      Vegetative shoot apices of 7 varieties belonging to 4 species ofSaccharum exhibit a uniseriate tunica. Periclinal divisions are more the exception than the rule in them. The corpus is distinguishable into a small subapical initials zone and narrow flanking and pith initials zones. During the changeover of the shoot apex from the vegetative to the reproductive, it increases considerably in size and more tunica layers are laid down which persist even in the later stages of inflorescence development. The spikelet primordia originate from the second tunica layer and enlarge with cells contributed by the corpus. The root apex is of the common monocotyledonous type with three tiers of initials, one each for the stele and root cap, and a common one for the epidermis and cortex. It belongs to theZea type based on the pattern of root cap formation.

    • The tea complex - I. Taxonomy of tea clones

      V S Sharma K S Venkataramani

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      The taxonomy of the species ofCamellia L. involved in the evolution of the tea plant is discussed at length; a key and descriptions of species are given for ready identification. It is inferred that the cultivated tea populations are complex species hybrids and in view of this, Art. 29 of the “Cultivated Code” is applied to name the tea clones.

    • Epidermal studies in some himalayan species of oaks and their taxonomic significance

      D K Jain V Singh

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