Volume 59, Issue 2
February 1964, pages 53-116
pp 53-71 February 1964
The hydrological conditions of the Bhavanisagar Reservoir and the plankton for the years 1961 and 1962 are detailed. There seems to be some difference in physico-chemical conditions during these two years when compared with the data of previous five years. Thermal stratification was rare but oxygen deficit in hypolimnion was severe. Supersaturation was rare and the higher pH values noted between 1956–1960 were not recorded during 1961–62. The electrical conductivity increased with depth and showed seasonal changes paralleling the changes in bicarbonate content. Deficiency of nutrients, phosphate and nitrate continued as usual though the silicate content was normal. The plankton organisms occurring in different months are listed. Excessive inflow and outflow restricted plankton blooms. The effect of the position of discharge sluices on the oxygen regimen and temperature are discussed.
pp 72-76 February 1964
A survey of the chromosome numbers has been conducted in 20 species of medicinally important Composites of Jammu and Kashmir State distributed under 16 genera.
pp 77-87 February 1964
A new species of petrified palm wood has been described from the Deccan Intertrappean beds near Mohgaon Kalan area, Madhya Pradesh. It differs from all the other known Indian fossil palms in some important characters and has been designatedPalmoxylon sahnii. It can be referred to theMauritia section of petrified palms.
pp 88-95 February 1964
Some floral abnormalities, forArgemone mexicana have been studied morphologically and anatomically. Aberrations have been regarded important in deriving the foliar origin of the organs discussed in the present report. Vascular supply of extremely abnormal stamens has been found to be accompanied by laticifers.
pp 96-102 February 1964
1. The highest percentage of staminate flowers was recorded in Sweet lime, and the least in Lemon Kaghzi, amongst the seventeen non-commercial citrus varieties studied at the Horticultural Research Institute, Saharanpur.
2. The maximum number of staminate flowers were found to open either in the early or late hours of the day.
pp 103-109 February 1964
Cultures were set with tissues from three species of insects,viz., G. mellonella, A. pernyi andM. melolontha in the basic medium (modified Trager’s C4) with haemolymph from each of them in a criss-cross way. The results when interpreted to see if there was any specificity in the action of haemolymph for the culture of tissues from a particular insectin vitro showed that:
(1) There is no specificity in the action of haemolymph.
(2) Slight differences in the action of haemolymph for the culture of different tissues exist but that does not appear to be specific, as tissues from all the insects showed a little better growth in the medium with haemolymph fromA. pernyi.
(3) The differences are explained to be due to possible differences amongst different haemolymphs in the richness of some organic and inorganic components.
pp 110-116 February 1964
A study of the nitrate reductase activity (NRA) and nitrate N levels at different stages of growth in the stem of 4 sugarcane varieties, has indicated that during the 7th, 8th and 9th month stages of growth of the plants, the observed nitrate N and NRA levels show a good degree of linear relation. Based upon this relation, it has been shown that nitrate N that is potentially significant (pN) in reduction could be calculated at the different stages of growth of the plants. A higher level of pN during the 7th, 8th and 9th month stages of growth in a cane variety appears to be indicative of the superiority of the variety in respect of yield.