Volume 85, Issue 5
May 1977, pages 269-368
pp 269-273 May 1977
In the palm leaf primordium, plications do not arise by schizogenous splits. If plications arise by splitting, the stomata of the palm leaf have to develop from various, morphologically indefinite internal layers instead of from the protoderm. Cell alignment in the lamina wing where plications arise is such that a simple schizogenous splitting cannot result in straight splits. The adaxial and abaxial ridges and furrows in the lamina tissue represent the earliest morphological expression of the development of plications by differential growth. In the juvenile leaf ofPhoenix, although a well developed haut is absent, the morphological equivalence of a haut is produced in the same way as in the adult leaf, and plications arise identically in the juvenile and the adult leaves.
pp 274-277 May 1977
Two new species of spiders,viz., Rhene khandalaensis andRhene decoratus described in this paper, were collected from Khandala, Dist. Poona, Maharashtra. This genus is being reported for the second time from India.
pp 278-282 May 1977
The activity levels of Aspartate aminotransferase (AAT, E.G. 184.108.40.206) and alanine aminotransferase (AlAT, E.G. 220.127.116.11) decreased in the cerebral ganglia of aestivating snail,Pila globosa. Heterogeneity of aminotransferases in the cerebral ganglia of normal and aestivated snails (studied by agar gel electrophoresis) revealed a decrease and also loss of isozymes during aestivation.
pp 283-291 May 1977
Seed morphology, seed coat development and structure have been studied inCrotalaria burhia Buch-Ham.,C. medicaginea Lamk.,Tephrosia hamiltonii Drumm. andT. apollinea Link. Seed coat is formed by the outer integument alone. Inner integument plays no role in its formation and degenerates. InTephrosia species, the inner layer of inner integument acts as an integumentary tapetum. The nucellus persists for a long time at the chalazal end in the form of nucellar pad in both of theTephrosia species.
pp 292-300 May 1977
The flowering behaviour of one cultivated late-winter variety ofindica rice as influenced by the natural variation in daylength and temperature is reported.
pp 301-309 May 1977
Amongst the different morphological features of rice varieties studied, no correlation was obtained between disease development and narrow or broad leaves, thick and thin leaves, pale and dark green leaves. However a strong correlation was observed between hairy and glabrous leaf texture and disease development. Hairy varieties suffered significantly more disease than glabrous varieties under natural field conditions though both were equally susceptible when pin-prick inoculated with the pathogen.
pp 310-318 May 1977
Glomus macrocarpus, a vesicular-arbuscular mycorrhizal fungus found to occur widely in Indian soils, helps potato plants to assimilate more phosphorus from the soil and thereby produce larger amounts of dry matter. Inoculating the seed tuber with a slurry of the spores was decidedly more successful than inoculating the soil directly. In an infertile soil, mycorrhizal plants took up 8 times more phosphorus and put forth five times greater growth than non-mycorrhizal ones. Radiotracer investigations proved that less easily available forms of native soil phosphorus were mobilized by the endophyte, particularly from soils low in fertility, enabling plants to feed on them with ease.
Under natural conditions, only 23% of the potato fields surveyed was found to carry spores of or root infection with endomycorrhizal fungi.
pp 319-326 May 1977
A phyllody disease of suspected MLO etiology was noticed on a plant ofRaphanus sativus in the fields of Sanganer, Jaipur, nearly 3 years ago; and later in other localities in and around Jaipur. A study of the various features of epidermal structure in the normal as well as diseased material has shown that apart from the stomatal types, which usually remain unchanged, the epidermal structure undergoes considerable change from normal to the diseased condition. The sepal, petal and carpel of of diseased flowers show phyllody and the stamen becomes sepaloid. And that the degree of phyllody in these organs increases in the direction of carpels.
pp 327-339 May 1977
The paper presents a theoretical approach for computing the wing beat frequency of a flier whether it be an insect, bird or bat in its normal state of hovering on the basis of mass flow of air. The calculated values are found to be in good agreement with the observed values. The paper describes the results of 5 species of insects, 4 species of birds and 3 species of megachiropteran bats totalling 136 samples. The mass of the fliers ranges between 0·07 gms to 744 gms and frequencies range from 125 cps to 4 cps respectively. It is concluded that the wing beat frequency of a flier in general varies with the state of flight.
pp 340-350 May 1977
Inheritance of 18 morphological characters, in six crosses of groundnut in which Gujarat narrow leaf mutant was used as the pollen parent, is reported. Albinism, dwarfism and testa colour gave a segregation ratio of 15:1; growth habit leaf-let shape, branching, number of primaries, secondaries, pigmentation on the shoot, pod and kernel size, beaked nature of pod, number of kernels per pod and kernel shape gave segregations fitting into a monogenic ratio of 3:1; hairiness of stem and leaf colour exhibited incomplete dominance (1:2:1); height of main axis segregated into a modified digenic ratio of 1:2:2:1:4:1:2:2:1 while the number of stomata gave two types of segregation (15:1 and 3:1) depending on the parentage.
pp 351-363 May 1977
The common carp,Cyprinus carpio Linn. has been studied for the development of the chondrocranium. A large number of early developmental stages of the embryos were fixed at regular intervals of time. The development of the cartilage has been traced from the serial sections which were cut at 10 micra. These sections were stained with Delafiel’s haematoxylin and eosin. Waxo model and graphic reconstructions were prepared. For some stages, bulk stained preparations were also made. Eleven stages have been investigated and described.
pp 364-368 May 1977
This investigation was carried out to study the occurrence of non-nucleate cytoplasmic vesicles during development of the embryo and endosperm inTorilis nodosa andPseudorlaya pumila. The origin and function of these non-nucleate cytoplasmic vesicles is discussed.