Volume 62, Issue 1
July 1965, pages 1-45
pp 1-9 July 1965
pp 10-16 July 1965
pp 17-24 July 1965
A petrified specimen probably a part of a petiole or rachis and showing affinities withPalmoxylon mahabalei is described and referred to the petiole genusPalmocaulon and designated asPalmocaulon mahabalei. According to Prof. Sahni’s classification (1943) which is based upon the combined scheme of Von Mohl (1845 and 1849), and Stenzel (1904), this specimen may probably be kept under the sectionCocos-like Palms.
pp 25-31 July 1965
Cultures ofMelosira sulcata were maintained in the laboratory for five months using Erdschreiber medium.
The temperature in cultures ranged from 15°–28° C. and the pH from 7 to 8·4. The diatom grows best at about 17° C. (22,000 cells/1.).
Cell division and multiplication of the diatom occurs every 2 to 3 days as in other centrales and the formation of auxospore once in 10 days. The auxospores, which have become reduced, can be restored to healthy growth by the addition of vitamin B12 (0·01 gm./100 ml.).
pp 32-35 July 1965
pp 36-45 July 1965
Effects of single GA3, IAA and MH and of their combinations with GA3 in natural rhythm of day and night and in shade in day + darkness at night have been studied.
The rise in leaf number as a result of many of the treatments did not result in any practical economic benefit to the tobacco crop because the rise in leaf number was not reflected in rise in leaf area and the dry weight.
It was observed that GA3 had no growth-promoting influence on tobacco plants when grown in shade, rather increased the starvational death, but usual growth-promotion was more or less resumed when the plants were transferred to natural light. It is concluded, therefore, that GA3 was neither metabolized nor destroyed nor inactivated in any way inside the plant tissue even in 20 days but its action was temporarily inhibited in shade and was resumed again after the reception of light. The dependence of GA3 action on light may be either a photosynthesis or auxin-mediated mechanism.