Volume 59, Issue 6
June 1964, pages 297-364
pp 297-317 June 1964
pp 318-327 June 1964
1. Effects of different concentrations of alloxan on the blood glucose and tissue glycogen levels of the estuartine clam,Meretrix casta (Chemnitz), have been investigated.
2. In alloxan-diabetic specimens, there is an increase in the glycogen content in the foot and digestive diverticula. The overall increase and the range of fluctuations was greater in the digestive diverticula.
3. Alloxan shows a differential effect on the quantity of glycogen in the tissues.
4. Alloxan effect onMeretrix casta is different from toxic and cold effects on the glycogen content.
pp 328-339 June 1964
The anatomy of the leptosporangiate fernTectaria amplifolia (V.A.V.R.) Christensen, one of the Aspidiaceae, has been worked out. It shows a number of resemblances in its anatomy with two other well-known Aspidioid genera likePeranema andDiacalpe. In addition it shows a number of other Aspidioid features which strengthen its reference to this family.
The rhizome is polystelic with 3–8 bundles, each bundle having exarch diarch xylem. The main bundles of the rhizome give rise to the petiolar traces which number three. The pinna traces are derived from these three bundles. The abaxial superficial, indusiate sorus produces sporangia with incomplete annulus of 14–18 cells. The spore output is 64. The spores are light brown in colour, bilateral and slightly planoconvex.
pp 340-349 June 1964
pp 350-359 June 1964
The structure and development of the root nodules ofTrigonella foenumgraecum, T. occulta, Canavalia gladiata andPhaseolus mungo have been studied. A brief resume of the salient features of root nodules of these host plants is given in the form of a table and some of the points such as the initiation of nodule, the behaviour, the depth of penetration, and the spread of the rhizobium within host cells are discussed. The funnel-shaped swellings of infection threads are considered to arise by emaciation due to stretching of the thread during the enlargement of the host cell harbouring it.
We are deeply indebted to Professor C. V. Subramanian, Head of the Department of Botany, for suggesting the problem, valuable suggestions and keen interest throughout this investigation.
pp 360-364 June 1964