Volume 73, Issue 4
April 1971, pages 155-207
pp 155-178 April 1971
Sediment core samples collected from the northeastern part of the Arabian Sea during cruise-2 on board I.N.S. ‘Darshak’ in January to February, 1967 have been analysed for study of the nature and distribution of Foraminifera. Ninety-two species of Foraminifera belonging to 40 genera of 16 families,viz., Textulariidae, Valvulinidae, Miliolidae, Ophthalmidiidae, Trochamminidae, Lagenidae, Planorbulinidae, Nonionidae, Camerinidae, Heterohelicidae, Buliminidae, Rotaliidae, Calcarinidae, Globigerinidae, Globorotaliidae and Anomalinidae have been identified and reported. Composition of Foraminifera and their concentration at different stations have been studied with reference to depth and state of preservation, benthic and planktonic Foraminifera being dealt with separately.
Foraminiferal species recorded for the first time in Indian waters are (1)Textularia pseudocarinata Cushman, (2)Virgulina concava Höglund, (3)Virgulina pauciloculata H. B. Brady, (4)Loxostoma rostrum Cushman, (5)Lagena sulcata (Walker and Jacob) var.spicata Cushman and McCulloch, (6)Lagena costata (Williamson) var.amphora Reuss, (7)Elphidium oceanicum Cushman, (8)Discorbis auracana Cushman and (9)Globigerina calida Parker.
The foraminiferal fauna of the continental shelf waters of the northwestern part of India is similar to that of Gulf of Cambay and most of the species reported in this paper are also known from the tropical Pacific and Philippines.
pp 179-185 April 1971
The paper deals with the cytological investigation of eight taxa,viz., Hydrolea zeylanica Vahl (2n=24),Ipomoea aquatica Forsk. (2n=30, 2n=30+1),Ottelia alismoides Pers. (2n=22 and 33),Monochoria vaginalis Presl ex Kunth (2n=52),Eichhornia crassipes Solms (2n=32),Pistia stratiotes L. (2n=28),Limnophyton obtusifolium Miq. (2n=22) andAmmannia salicifolia Monti (2n=28) which were collected from the suburbs of Mysore. Of these, the chromosome numbers forHydrolea zeylanica andAmmannia salicifolia are newly reported.
Karyomorphological studies have been made inHydrolea zeylanica, Ammannia salicifolia, Ipomoea aquatica, Ottelia alismoides, Eichhornia crassipes andLymnophyton obtusifolium. Mitotc studies ofOttelia alismoides reveal the occurrence of both diploid and triploid races. Of these, triploid number of 2n=33 is the first report. An extra small chromosome from somatic nuclei is also the first record inIpomoea aquatica. Further,Ottelia alismoides shows the occurrence of univalents, tetravalents and hexavalents, whileLimnophyton obtusifolium reveals the presence of chromatin bridge, fragment chromosome and micronuclei.
pp 186-191 April 1971
Certain peculiarities in the lateral branching ofCalotropis gigantea andCalotropis procera are investigated.C. gigantea occasionally shows fusion of an inflorescence branch or branches with the internode of the main axis. The corresponding histological changes in the nodal anatomy are described. Altogether, there are four important variations from the normal branching habit and nodal anatomy inC. gigantea. In some cases the leaf trace, the vegetative branch trace and the inflorescence branch trace appear to have a common gap. In certain other cases, the leaf trace and vegetative bud trace appear to have a common gap, and the inflorescence bud trace has another gap. In another case the leaf and inflorescence bud traces show a common gap. The concept of the branch gap is discussed.
pp 192-201 April 1971
In both soil and sand cultures, a supply of 10 ppm boron to root medium was highly injurious to the groundnut (TMV-2) plants. The boron-treated plants grown it sand cultures absorbed relatively much higher quantities of boron and the foliage manifested chlorosis (yellowing) more quickly than in the boron-treated plants raised in soil cultures. In sand cultures, on the ninth day after boron treatment, the basal, mature middle and apical developing leaves accumulated excessive boron contents (2·51, 2·86 and 2·62 mg/g on oven-dry weight, respectively) and turned severely chlorotic; roots, stems and petioles also contained more boron content but much less than in the leaves; the chlorotic leaves were associated with decrease in total N and protein N and with considerable increase in soluble N; the contents of free amino-acids aspartic acid, glutamic acid, arginine, glycine and alanine were markedly enhanced when compared to the control plants.
pp 202-207 April 1971