Volume 77, Issue 3
March 1973, pages 93-137
pp 93-100 March 1973
Using the criteria of leaf anatomy, carbon dioxide compensation point and photosynthetic rate under reduced oxygen tension, a number of the local herbaceous and dicotyledonous weeds were screened for the occurrence of the C4 pathway of photosynthesis. Of the thirty-two species, belonging to nine families seventeen species revealed the characteristics of the C4 plants. All of the plants surveyed here were hitherto not tested and therefore the present results extend the number of plants already known to possess the Hatch-Slack pathway of photosynthesis. Another noteworthy feature of the investigation was the finding of interspecific differences within the generaHeliotropium, Alternanthera, Mollugo andEuphorbia in the presence or absence of the C4 pathway.
pp 101-108 March 1973
A new species of interstitial archiannelidTrilobodrilus indicus, collected in the intertidal sands of Waltair coast (Bay of Bengal), India, is described in this paper. The archiannelid markedly differs from the earlier known species of the genus and is distinguished from its closest relativeT. heideri Remane, by its smaller size, shape of prostomium, deeply notched pygidium, structure of epidermal glands and the position of gonads.
pp 109-115 March 1973
Common carp spawn from 3-day to 25-day old was treated with aureomycin, B-complex, yeast. aureomycincum B-complex, aureomycincum yeast and B-complexcum yeast. Survival during first 25 days of life was found to be enhanced significantly by treatments with yeast B-complexcum yeast and aureomycincum Yeast.
pp 116-130 March 1973
Of the eleven polychaetan species described here, three species described by Stoliczka under the formerly broad-based genusSerpula are now transferred to other genera,viz., Glomerula, Sarcinella andParsimonia. Among the six species described here as new to science, two have for their proper placement, necessitated creation of two new generaFissurituba andLacinituba falling respectively under the subfamilies Ditrupinae and Lacinitubinae. The two generaOmasaria Regenhardt andProliserpula Regenhardt are new to South Indian Cretaceous Formations.
pp 131-136 March 1973
A study of the deoxyribonuclease and ribonuclease activities and nucleic acid levels in sandal affected by spike mycoplasma was made. A serious disturbance in the nucleic acid metabolism noticed at the young leaf stage in the diseased plant suggested a rapid multiplication of the mycoplasma at that stage. The relative levels of nucleic acids and nuclease activities appear to indicate the migration of the infective organism from the older diseased leaf tissue to regions of fresh vegetative growth.
pp 137-137 March 1973 Erratum