THE GENETICS OF FLOWERING TIME IN RAPHANUS SATIVUS L. III. EARLY X LATE CROSSES, F, AND F2GENERATIONS
ABSTRACT:
Crossing experiments between early flowering and late flowering lines were conducted in the green- house. For this purpose, 10 Early and 10 Late plants were divided into two sets (each set consisting of 5 Early and 5 Late plants). The crosses were made between Early and Late plants in all the possible combinations (including reciprocals) within each set. No significant differences between the crosses and their reciprocals were found for the time of flowering. The data of both the F, and F2 plantings were adjusted by comparing with check plants to make the data of these plantings comparable to that of the original parental planting. Frequency distributions of the Fj and F2 showed no dominance for the time of flowering and indicated that there probably

DISTRIBUTION OF PEROXIDASE IN REGENERATING ROOT SEGMENTS OF TARAXACU M OFFICINALE WEB.
ABSTRACT:
Qualitative and quantitative measurements of the activity of peroxidase was carried out in the regenerating and non- regenerating parts of Taraxacum officinale Web., root cuttings. High peroxidase activity was found in the differentiating tissues as compared to the non- regenerating ones. A relation- ship between the peroxidase activity and the formation of new tissues was observed.

COMPARATIVE STUDY OF PYRUVIC KINASE AND PHOSPHATASE IN GLYCOPHYTtC AND HALOPHYTIC SPECIES OF BEEr ROOT
ABSTRACT:
Effect of sodium ion concentration on potassium dependent pyruvic kinase reaction was investigated in glycophytic (Beta vulgaris) and halophytic (Beta maritima) plants. It was found that synthesis of pyruvic acid is mainly through phosphatase in B. vulgaris. Where as this was partly undertaken by kinase in B. maritima. These

THE EFFECT OF APPLIED GROWTH HORMONES ON CELL PROLIFERATION IN THE CAMBIAL ZONE OF THUJA ORIENTALIS L.
ABSTRACT:
The effect of IAA, GA and Kinetin on cell division in the cambial zone of Thuja orientalis L. was studied. IAA was more effective than either GA or Kinetin when used alone. Interaction of growth substances in the combinations used have shown a greater tendency towards cell divisions for the first 15 days of the experimental period. Between 15-30 days period, number of cells decreased in all experi- ments except where IAA and GA were used together in culture. Maximum number of cells were produced when IAA, GA and Kinetin were used together. Cell division in the cambial zone responded more to growth hormones used in tissue cultures than applied in lanolin. This has been related to better physical conditions prevailing in cultures.

THE EFFECT OF APPLIED GROWTH HORMONES ON XYLEM DIFFERENTIATION IN COLEUS BLUM El STEM TISSUE
ABSTRACT:
Xylem differentiation was observed as a response to IAA alone, interaction of IAA and GA and combined effect of IAA, GA and Kinetin. There was no significant difference in the amount of xylem differentiation when 0.1 ppm Kinetin was added

A CONTRIBUTION TO THE AUTECOLOGY OF CAPPARIS DECIDUA (FORSK.) EDGEW. II. EFFECT OF EDAPHIC AND BIOTIC FACTORS ON GROWTH AND ABUNDANCE.
ABSTRACT:
Soil samples were collected at surface and subsurface levels from several sites of occurrence of Capparis decidua (Forsk.) Edgew. The community associates and community dominants of C. decidua were recorded. Soil was analyzed for texture, structure, consistency, maximum water holding capacity, wilting coefficient and hydrogen ion concentration. In angular blocky soil growth was found to be the best and the abundance was low, while in granular and crumb soil highest abundance with poor growth was found. In sub-angular blocky soil structure intermediate growth and abundance were observed. Best growth was found in clay loam followed by sandy clay loam soils but the abundance was less in these soils. The highest abundance coupled with poor growth was found in sand while sandy loam and

GENUS PERIDINIUM EHRE NBERG, FROM INSHORE WATERS OF KARACHI
ABSTRACT:
The present paper deals with a study of eleven species of Peridinium from inshore waters of Karachi. All the species are first reports from Pakistan’s coastal area. Peridinium truncatum is recorded from the Indian Ocean for the first time. The species diversity of Peridinium was very high from October to December, 1970, which is the post- monsoon period in the N. Arabian Sea. Most species indicated the coastal nature of the area under study. The temperature and salinity ranges within which all the species were found growing in nature are given.

ON THE MORPHOLOGY AND DEVELOPMENT OF SOME CHLOROCOCCALES FROM KARACHI
ABSTRACT:
The morphology and development of eight species of chlorococcales comprising of 4 genera viz, Chlorella, Chloeococcum, Monoraphidium and Scened esmus is described. This survey of plank tonic algae

MYCORRHIZAE IN THE PAKISTAN ERICALES
ABSTRACT:
Ectendomycorrhizae of the Pakistan Ericales viz., Rhododendron lepidotum Wall, ex D. Don., R. afghanicum Aitch. & Herasl., Gaultheria trichophylla Royle., Cassiop e fastigiata D. Don., Pyrola rotundifolia Michx., and Monotropa hypopitys L., were described. Microscopic examination showed typical endophyte in and on the roots and its absence from aerial or subaerial parts. This was supported by attempted isolation experiments. Morphological and anatomical studies suggest a series of increasing saprophytism and its correlated characters from Ericaceae, through Pyrolaceae to Monotropaceae. Endogone spores, responsible for the formation of vesicular- arbuscular mycorrhiza in the majority of plants, were extracted from heath rhizospheres, except that of Monotropa hypopitys, but

FUNGI OF KARACHI— SUPPLEMENT II
ABSTRACT:
No abstract

ROOT NODULES IN SOME MEMBERS OF ZYGOPHYLLACEAE GROWING AT KARACHI UNIVERSITY CAMPUS
ABSTRACT:
Bacterial root nodules in Zygophyllaceae were re'ported from sandy soils of Egypt by Sabet (1946) and Mostafa & Mahmoud (1951). Allen & Allen (1950) did not find any endophyte in root nodules of Tribulus cistoides L. Khan (personal communication) has also reported absence of nodules in Zygophyllaceae. On the basis of these contradictory reports a survey of Zygophyllaceae was made from Karachi University Campus Area. The soil around this area is poor in nutrition and varies from sand to clay loam in texture (Qadir et al, 1966). Three genera namely Tribulus, Zygophyllum and Fagonia were surveyed. Fig. 1 shows nodules on roots of Tribulus

INHIBITION OF CERTAIN HUMAN PATHOGENIC FUNGI BY STACHYBOTRYS ATRA
ABSTRACT:
With the increasing recognition of fungi as disease causing organisms of man and animal, surveys of soil fungi as sources of new antimycotic agents have been made (Brian, 1951; Broadbent, 1966; Blunt & Baker, 1968). The efficacy of griseofulvin, a metabolic product of Penicillium nigricans, P. urticae and P. raistrickii, as a therapeutic agent in the treatment of dermatomycosis is well known (Brian, 1960). Considering the inhibitory effects of Stachybotrys atra,a dematiaceous fungus and a common soil inhabitant, towards a number of soil micro- organisms, an experiment was carried out to see its effects on certain human pathogenic fungi.