THE EFFECT OF RECIPROCAL DIFFERENCES ON THE GENETIC COMPONENTS OF VARIATION IN A FIVE- PARENT DIALLEL CROSS OF COMMON WHEAT
ABSTRACT:
THE EFFECT IF SIGNIFICANT RECIPROCAL DIFFERENCES ON THE GENETICS COMPONENTS OF VARIATION WAS STUDIED THROUGH DIALLEL CROSS ANALYSIS OF FIVE PARALLEL F2 DIALLEL TABLE IN COMMON WHEAT (TRITICUM AESTIVUM L.). THE CHARACTER STUDIED WERE A NUMBER OF SPIKEL, PER SPIKE, 1000 KERNEL WEIGHT (IN GRAM) AND THE YIELD OF GRAINS PER PLANT (IN GRAMS). THE F2 DIALLEL TABLE WAS DIVIDED IN TO TWO SUB-SETS OF FIVE ARRAYS OF EACH , ONE BY KEEPING THE FEMALE PARENT CONSTANT AND THE OTHER BY TREATING THE MALE PARENT CONSTANT. THE RESULTS REVEAL THAT PARENTIONING THE F2 DIALLEL TABLE INTO TWO SUCH SUB-SETS AFFECT THE ARRAY VARIANCES (VR) AND THE ARRAY PARENT-OFFSPRING COVARIANCES (WR). THIS EFFECT IS REFLECTED IN THE POSITION OF PARENTS WITH RESPECT TO ORDER OF DOMINANCE AND PROPORTION OF POSITIVE AND NEGATIVE EFFECTS OF GENES, FOR ALL THE CHARACTERS STUDIED. THE EFFECTIVE COMPONENTS OF VARIATION (D AND H2) REMAIN UNAFFECTED.

FLORAL BIOLOGY AND VARIATION IN TWO CULTIVARS OF EGGPLANT
ABSTRACT:
Variation in the vegetative, floral and fruit characters of different stages of growth was studied in two local cultivars of eggplant. In the most of the characters nonsignificant differences were observed between two varieties at early stages of growth , however significant differences were observed in significant variables at later stages of growth .

TAXONOMIC REVISION OF THE FAMILY STERCULIACEAE FROM PAKISTAN
ABSTRACT:
Ten genera 19 species of Sterculiaceae, mostly cultivated, are discussed. Keys to the taxa and descriptions are provided. Following Hutchinson several species have been transferred to Brachychiton, Fermiana and pterygota from Sterculia. Correct nomenclature and authority have been adopted in addition to a few new records from the area.

SOME PHYSIOLOGICAL AND BIOCHEMICAL STUDIES ON SPINACH GROWING ON SALINE SOIL
ABSTRACT:
Rate of respiration and activities of amylase , acid and alkaline phosphatase were compared in glycophytic and halophytic spinach grown on normal and saline soils. Increase in the specific activities of invertase and acid phosphatase associated with the decrease in the specific activity of alkaline phosphatase was noticed in halophytic spinach diversified behavior of enzymes in response to the salinity in various halophytes was attributed to their specific internal metabolism depending on the nature of adaption.

DIPLOIDIZATION AND PATHOGENICITY IN PROTOMYCES INUNDATUS
ABSTRACT:
it is shown that opposite mating type genuine haploid endospores of Protomyces inundatus do not cause infection t the host plant Apium nodiflorum. Usually infection is caused by sexually incompatible diploid endospores

NUCLEAR BEHAVIOUR DURING TELIOSPOSE GERMINATION IN USTILAGO TRITICI AND U. NUDA
ABSTRACT:
When germinated upon water, the mature teliospores of Ustilago, tritici and U. nuda gave rise to 4 celled monokaryotic promycelium. Nuclei moved from adjacent promycelial cells into a conjugation tube . The conjugation tube elongated into a branchis monokaryotic or dokaryotic mycelium. The haploid number of chromosomes appeared to be a 4. The growth of these two smut fungi on potato dextrose agar was not identical.

EFFECT OF DIFFERENT CARBON SOURCES ON SPORE GERMINATION OF HELMINTHOSPORIUM ORYZAE
ABSTRACT:
Out of the monosacchrides and oligosaccharides D(+)---glucose and D(+)--- sucrose were found to be the best carbon sources for the germination of spores of helminthosporium oryzae , Whereas D (+) – minnose did not favour spore germination at 2 to 5 percent concentrations. Distilled water did not enhance the germination of spores but a stimulatory effect was observed in tap water. There was no germination in any of the concentrations of oxalic and malic acids even after 5 days. Mostly mono and bipolar type germination was noticed . A gradual change in color of conidia from dark brown to light brown was observed.

SEASONAL DISTRIBUTION OF PHYTOPLANKTON IN (KINJHAR) KALRI LAKE
ABSTRACT:
An ecological survey of phytoplankton in Kinjhar Lake was carried out form March 1968 to February 1971 at the surface and from March 1970 to February 1971 at various depths. Phytoplankton belonging to three algal groups , Myxophyceae (22 species belonging to 12 genera), Bacillariophyceae (53 species belonging to 27 genera), Chlorophyceae (19 species belonging to 8 genera) were observed, Mycrocyslis aeruginosa was the most abundant species present throughout the year at the surface but the maximum growth was observed in summer. Melosira gramuleta and Spirogyra fuellebornei were next in abundance. Kinjhar lake is highly eutrophic due to the presence of nearly permanent bloom of Myxophyceae and significant growth of diatom species.

EFFECT OF HYDROSTATIC PRESSURE ON THE REDISTRIBUTION OF CELL ORGANELLES IN BRYOPSIS PLUMOSA (HUDS.) C. AG.
ABSTRACT:
Bryopsis plumosa (Huds.) C. Ag. When centrifuged at 1000 r.p.m showed a concentration of cell organelles at the tip of ramuli, thus rendering it dark green. When left undistributed, the organelles were found to return to their normal position after a few hours. B. plumosa is an extreme barophobe (Shameel, 1973d). It showed cell morphological abnormalities after treatment to 250 atm and a considerable weight loss after subjection to 500 atm (Shameel and Ohno, 1972) with no induction of reproduction even after an exposure of 800 atm (Shameel, 1973b). The effect of pressures below 250 atm on the redistribution capability of cellular organelles in this alga was therefore examined.

A PRELIMINARY
ABSTRACT:
Oxidation pond is a lentic body of water in

SIPHON TECHNIQUE FOR ISOLATING BUOYANT SPORES
ABSTRACT:
A siphon technique has been developed to isolate petrified , spherical, uncompressed, buoyant spores dispersed in soil or embedded in mineral matter. Certain fossil spores and pollen grains can be separated from heavier mineral matter by suspending them in Thoulet’s solution (Potassium iodide and Mercuric iodide : aqueous solution adjusted to sp. Gr.2.5) and in Bromoform 2.3 sp. Gr. As recommended by Naumova and Tiniofeyev in Schopf (1962). There are some uncompreesed spherical spores and pollen grains which contains air and are, therefore, buoyant. Certain Endogonespores have the same characteristics. In such cases specific gravity methods have been found to be un satisfactory. Petrified , uncompressed spores of Rhynia major Kidston and lang are buoyant and very fragile to handle (Bhutta, 1969). By the siphon technique buoyant spores of Rhynia major have been successfully isolated. The method has been experimented to isolate

WHEAT DISEASES SITUATION IN PAKISTAN DURING THE CROP YEAR
ABSTRACT:
During the crop season 1972-73 generally there was more rainfall than previous years spreading over a period of four months (January to April) with intermittent bright days. While this weather favoured the growth of wheat crop it immensely helped disease development too. Leaf rust, especially was wide-spread in the main wheat growing areas if Sind, Punjab and N.W.Frountier Province and all the commercial varieties were severely infected. Similarly, stripe rust was severe in the Northern toot hills and Azad Kahsmir. Incidence of Flag smut was also on the increase . The region wise situation of wheat diseases during 1972-73 is given in description.