Volume 85, Issue 3
March 1977, pages 107-171
pp 107-146 March 1977
The paper gives descriptions of 18 cyprinid species from lake Kolleru. These descriptions have been proved necessary because comparison of specimens of each of the species from the lake with relevant existing descriptions has shown that many of the latter are inadequate. Of the 18 species, 8 are new records for the lake.Danio devario reported for the first time from the lake also happens to be a new record for the entire area of Krishna-Godavary river systems. The taxonomic study has shown that : (1)Chela laubuca (Ham. Buch.) is polytypic, (2) the differences betweenOxygaster andChela justify their being treated as distinct genera though these were considered as congeneric by some earlier workers, (3) available data are not adequate to establish whether the subspecies recognised underB. sarana are valid or not, (4) the specimens with a pair of barbels from Madras identified asB. sophore by Raj may beB. chola (Ham. Buch.), (5) the specimens identified by Day asB. sophore are not so; these specimens are now without a valid name, (6)Barbus sophoroides Günther appears to be a junior synonym ofB. chola on available evidence, (7)B. ticto from different localities shows variation in the number of pored lateral line scales and the differences observed in this character do not seem to be of infraspecific significance, (8) the genusRohtee Sykes is provisionally considered as including three subgenera:Rohtee s. str.,Mystacoleucus andOsteobrama. Keys to identify the species ofBarbus, Cirrhinus, andLabeo are given.
pp 147-155 March 1977
Total protein nitrogen, pure protein nitrogen, PN/TN (pure protein nitrogen/total protein nitrogen), nonprotein nitrogen, crude protein, pure protein, albumin, fat, moisture and ash content ofClarias batrachus were determined for a period of twelve months. Well-marked seasonal variations were observed in the concentration of different chemical constituents and these changes have been attributed to factors like feeding and gonad maturation. The low values recorded for nitrogen, protein fractions and fat during the spawning period presumably indicate mobilization of these constituents towards gonad development. Similarly, an increase in the concentration of these constituents during the post-spawning months might be due to the recovery of the fish from the strenuous act of spawning. The seasonal cycle of moisture was found to vary inversely with that of the fat. The variations in the ash content were not well marked. The rise and fall of the biochemical constituents in different seasons also appear to coincide with the high and low, feeding activities of the fish.
pp 156-159 March 1977
BetweenThespesia populnea andT. lampas, more attention has been given to review the taxonomic status of the latter. The stigma ofT. lampas resembles with that ofT. populnea, whereas many other characters such as habit, gland on the midrib, non-caducous involucre, calyx teeth and capsule shape differ fromT. populnea. They also differ in their ecological adaptations. The chromosome number is found to be 2n=26 in both of them indicating their relationship. They also possess different chromosome numbers having 2n=28 inT. lampas and 2n=24 inT. populnea. Further, they fall apart from each other in size of the chromosomes. The cytological results and morphological characters, therefore, suggest the removal ofT. lampas fromThespesia.
pp 160-166 March 1977
Water stress has direct effect on growth, nodulation and rhizosphere micropopulation ofPisum sativum. The growth of the plant was more where the field capacity was maintained daily. The rate gradually slowed down with the water stress. The nodules were more in daily-watered plants than in plants watered on alternate days and once in three days. Similarly number of effective nodules and size of the nodules were more in plants watered daily.
Rhizosphere microorganisms were also affected by the water stress. Moderate water stress reduces their number but more severe stresses leads to considerable reduction in their frequency of occurrence. The fungal flora changed both quantitatively and qualitatively with the water stress.
pp 167-171 March 1977
Differences on dye-binding capacity (DBC) values of proteins of leaves of different polyploidal mulberry varieties have been studied. Further, DBG method has been successfully employed to estimate mulberry leaf protein and with the help of regression lines polyploidal status of mulberry varieties are assessed.