EFFECT OF BREEDING SYSTEM ON THE GENOTYPIC STRUCURE IN TRIFOLIUM SPECIES
ABSTRACT:
The effect of breeding system on the genotypic structure was studied in 3 Trifoilum species with contrasting breeding system. The two out- breeder’s populations were more variable genetically and more heterozygous than inbreeder’s populations. However, the inbreedr’s populations exhibited an excess of heterozygotes compared with panmictic expectations adjusted for the known amount of inbreeding; whereas the out-breeder’s populations were as heterozygous as would be expected. Some of the several forces which might account for the so-called “heterozygosity paradox” are discussed.

GENETIC STUDIES IN MUNG BEAN (VIGNA RADIATA (L) WILCZEK)
ABSTRACT:
Studies on the inheritance of six characters were carried out in a cross between exotic var. kabuli and local var. Pak 22 of mung bean having contrasting plant characteristics. Tolerance to mung bean yellow mosaic virus (MYMV) was found to be controlled by a single pair of genes; the F1 showed intermediate reaction. Short

LINKAGE OF THE GENES PR AND PRE DETERMINING SHORTENING OF THE INFLORESCENCES IN PISUM
ABSTRACT:
In studies with the linkage of the genes pr and pre, the gene pr was found to be located in chromosome 3 and pre in chromosome 4. Both the genes are responsible for the shortening of inflorescences length.

HYDRAZINE INDUCED POLYGENIC MUTANTS IN FIELD BEAN (DOLICHOS LABLAB L. var. LIGNOSUS)
ABSTRACT:
Six Hydrazine induced polygenic mutants in filed bean were isolated from M2 generation and their breeding behavior was studied in M3 generation by estimating genetic parameters for quantitative characters. High heritability values were observed for plant height followed by number of primary branches per plant. High values of genotypic co-efficient of variation

EFFECT OF ABA AND GA3 ON SEX EXPRESSION OF CUCUMIS SATIVUS AND LUFFA CYLINDRICA
ABSTRACT:
Effect of ABA and GA3 on sex expression of Cucumis sativus and Luffa cylindricawere were investigated under field conditions GA3 promoted male tendency in both the plants, ABA promoted male tendency in male L. cylindrica, with no effect of sex expression in C. sativus. ABA application increased number of flower buds and their abortion in L. cylindrical whereas it decreased flower bud formation in C. sativus.

ASPECTS OF THE METABOLISM OF ADANSONIA DIGITATA L.
ABSTRACT:
Seeds of Adansonia digitata contain appreciable quantities of sucrose, starch, proteins and lipidsas reserve food materials . The food reserves in the seeds decreased during the first two weeks of germination due to hydrolysis by enzymes, reflecting the increase in the activities of invertase and lipase enzymes. It is suggested that the initial reaction in the utilisation of sucrose in A. digitata seeds is probably the invertase hydrolysis of this desacchride to glucose and fructose. High lipid content in the seeds is converted in the free fatty acids and glycerol by lipase enzymes which are then fed in to the glyoxylate cycle to release sucrose which is further utilized to generate energy for the growth of embryo.

ROOR ASSOCIATED NOTROGEN FIXATION BY SUGARCANE (SACCHARUM OFFICINARUM L. VAR. COL- 54) IN PAKISTAN
ABSTRACT:
Nitrogenate activity associated with the roots of sugarcane (var. COL-54) was estimated from June 1983—April 1984. Maximum mean acetylene reducing activity (ARA) was observed in preincubated unwashed roots (11-631 nmoles

COMPARATIVE STUDY OF ANATOMICAL CHARACTERISTICS OF EARLYWOOD AND LATEWOOD OF BLUEPINE (PINUS WALLICHIANA, A.B. JACKSON)
ABSTRACT:
The anatomical characters of earlywood and latewood in three mature trees of Blue Pine were studied. Some of the features observed , do not appear to have been reported in the literature. These are :- the occurrence of crassulae or bars of Sanio on radio walls of earlywood tracheids; Pits with serrate tori on radial walls of early wood and latewood tracheids; Biseriate arrangement of pits on the radial walls of earlywood; occasional occurrence of vestured pits in earlywood ; and occasional occurrence of fused fusiform rays in both in earlywood and latewood.

ESTIMATION OF LIGNIN, HOLOCELLULOSE AND ALPHACELLULOSE CONTENT OF EARLYWOOD AND LATEWOOD AMONG INNERWOOD AND OUTER OF BLUE PINE, (PINUS WALLICHIANA A.B. JACKS.)
ABSTRACT:
Three major cell wall components i.e. lignin, holocellulose and alphacellulose were determined for earlywood (juvenile wood) and latewood (adultwood) among innerwood and outer wood and in different height levels in Blue Pine trees. Latewood was consistently lower in lignin content and higher in holocellulose and alphacellulose content than earlywood. Both earlywood and latewood form innerwood consistently higher in lignin content and lower in

EMBRYOGENESIS IN SUSPENSION CULTURES OF PAAPAVER SOMNIFERUM L.
ABSTRACT:
Papaver somniferum L. seedlings produced a light green, soft and friable callus when cultured on 1/2 Murashige and Skoog (MS) medium containing 2, 4-D( 0.5 mg/1) and Kinetin (0.1mg/l) . After 2-3 subcultures, callus pieces transferred to liquid medium and placed on orbital shaker showed active growth and formation of many cell clumps with loosely arranged cells. Structures resembling various stages of embryo development found in suspension cultures when transferred on solid MS medium containing Benzylaminopurine (0.5 mg/l), Adenosine sulphate (25 mg/l) and Gibberellic acid (10 mg/l) gave rise to green globular embryoids.

THERMOTHERAPY AND MERISTEM TIP CULTURE OF SOLANUM TUBEROSM FOR THE ELIMINATION OF POTATO VIRUSES X, S AND Y
ABSTRACT:
Meristem tips of 0.4 mm excised form solanum tubaerosum cultivars cardinal and desiree having undergone thermotherapy at 34oC for 11-60 days regenerated into rooted plantlets. The effect of duration of thermotherapy on regeneration potential of meristems was insignificant (P> 0.95). Thermotherapy for 60 days in cv , cardinal resulted in 8, 35 and 46% elimination of potato

COMAPARATIVE STUDIES ON DIRECT SEEDING VS TRANSPLANTING TEXCHNIQUES OF PEDDY
ABSTRACT:
A study on different seeding techniques of paddy was carried out in loamy and sandy loam soils during 1982 and 1983. The seeding techniques used were; manual transplanting of paddy seedling, broadcasting of the pre-germinated seeds, and drilling of dry seeds in “watter” conditions. Amongst the common kharif weeds of paddy, Cyperus iria Linn. was in abundance in all the treatments. The grain weight produced by pre-germinated seed was 14 time more than that of the paddy seedlings transplantation, while the un-germinated seeds caused 6% reduction in weight through drilling. The maximum paddy yield (5.1 t/ha) was also associated with puddled broadcasting of pre-germinated seeds registering an increase of 35% over traditional method of paddy transplanting. Yield was highly correlated (r=0.99) with grain weight in a linear fashion.

VEGETATION OF SOME FOOTHILLS OF HIMALAYAN RANGE IN PAKISTAN
ABSTRACT:
A quantitative ecological survey was carried out at 17 locations near the road side on the Great Silk Road from Gilgit to Passu. Ephedra gerardiana was ecologically similar Artemisia scoparia while Haloxylon thomsinii showed similar relationship Caparis spinosa . Six communities have been recognized on the basis of species dominance, importance values and similarity coefficient. In most cases the co- dominant species of one community type was also prominent in other communities indicatiing similarities between some communities in their species composition. In general communities were homogeneous.

LIFE FORM AND LEAF SIZE SPECTRA AND PHYTOSOCIOLOGY OF SOME LIBYAN PLANTCOMMUNITIES
ABSTRACT:
Life form and leaf size spectra of four ecological diverse plant communities were studied by Raunkiaerian and quantitative ecological methods. The Raunkiaerian spectra were similar for all the commuinities whereas the spectra based on quantitative basis differentiated the communities physiognomically. The characteristics revealed were Stipa tennassima— Futicose lichen Community on low Calcarious hills of Turhoona with clay loam soil: chamaephytic and leptophyllus ; Salicornia fruticosa –Aeluropus lagopoides community on saline flat of Zwara with clay loam soil: chamaephytic and nanophyllus; Paraphalis incurva – Lotus sp.- Artemisia compestris community on the sand dunes of Bir ghanam with sandy loam soil : therophytic and leptophyllous and Crepis sp. – Paronychia Arabica – Erodium laciniatum community on abandoned field at Zeltin with sandy clay loam soil: therophytic and microphyllous. The coverage , maturity and homogeneity of communities were low. Only one community had high maturity.

PHYLOGENY AND CLASSIFICATION OF PAKISTANI LEGUMES
ABSTRACT:
The latest subfamilial classification of the legumes is reviewed , and the genera of Pakistani legumesare arranged according to it. The tribal organization of the subfamilies is summarized and discussed for Pakistan. The Pakistani legume flora is compared with that of the central Brazilians savannas , and a correspondence between the Pakistani legume flora and the climate and vegetation of Pakistan is noted.

POLLEN MORPHOLOGICAL
ABSTRACT:
A total of 22 species Androsace occurring in

SEED STRUCTURE IN RELATION TO THE TAXONOMY OF THE HIBISCEAE (HIBISCUS AND LAGUNARIA)
ABSTRACT:
The internal and external features of the seeds of 23 species of the Hibisceae (Malvaceae) have been studied with the help of light and scanning electron microscopes. Seed structure and its relation to the tribal division of the family is discussed.

EFFECT OF INOCULUM DENSITY OF DRECHSLERA SOROKINIANA AND FUSARIUM AVENACEUM ON THE INCIDENCE OF WHEAT ROOT ROT IN OKLAHOMA
ABSTRACT:
Inoculum density of Drechslera sorokiniana and Fusarium avenaceum on the incidence of wheat root rot disease on hard red winter wheat (Triticum aestivum) cv. ‘’Danne’’ were evaluated in the glass house. Percentage recovery of D. sorokiniana from subcrown internode ranged from 48-97% as the inoculum density increased from 1 to 1000 conidia per g of soil and plateaued between 250 t0 1000 conidia per g of soil. Percentage recovery of F. avenaceum from subcrown internodes ranged from 41-57% as inoculum density increased from 1 to 1000 macroconidia per g of soil, plateaued between 100 and 500 macroconidia per g of soil , and finally declined to 45% at 100 macroconidia per g of soil. Disease severity rating of the subcrown internodes based on percentage lesions covering the surface areas of the internodes followed similar trend for each of the pathogens.

CONTROL OF PHAKOPOSORA GREWIAE WITH PLANT
ABSTRACT:
Water soluble diffusates of 15 vegetable seeds and 14 spices were tested against urediniospore

SURVIVAL OF AQUATIC HYPHOMYCETES UNDER DRY CONDITIONS
ABSTRACT:
Aquatic hyphomycetes which constitute a dominant mycoflora on decaying submerged plant debris have also been found to occur in terrestrial systems. Mycelial and conidial survival of aquatic hyphomycetes under xeric conditions is presented.

ISOLATION OF FIVE FRANKIA STRAINS FROM ACTINORHIZAL NODULES OF CASUARINA GLAUSA
ABSTRACT:
Five strains of Frankia isolated from root nodules of Casuarina glausa collected from different localities of Islamabad were characterized by the occurrence of branched and septate hyphae bearing spongia and vesicles typical of Frankia. The strains showed marked differences in their growth requirements, growth rate, nitrogen fixing ability, production of pigments and infectivity of host seedings, CAQP1 and CAQP2 strains infected C. glauca seedlings while CAQP3, CAQP4 and CAQP5 failed to induce nodules on the host.

EVALUATION OF BACTERIAL LEAF SPOT DISEASE RESISTENCE IN PEPPER
ABSTRACT:
Eight red pepper cultivars were tested against bacterial leaf spot by spray inoculation with Xanthomonas campestris pv vesicatoria. Disease severity is high in pot experiments as compared to field. Cultivars ‘’Nilum’’ and ‘’Jelapeno’’ were found to be resistant while ‘’Picora’’ was moderately susceptible.

ALGINATE AND LAMINARINE
ABSTRACT:
Laminarine and alginic acid content of the brown

SOME ALGAL FILAMENTS ISOLATED FROM SONDA COAL DEPOSITS (DISTRICT THATTA). SIND, PAKISTAN
ABSTRACT:
Some algal filaments isolated during the study of plant microfossils related to Paleocene period from Sonda coal fields have been described. These filaments include Chaetomorpha sp., Ulothrix tenerrima of Chlorophyceae, Oscillatoria princeps var. pseudolimosa and Lyngbya truncola var. burmense of Cyanophyceae.

EFFECT OF COPPER SULPHATE ON THE GROWTH OF CLADOPHORA GLOMERATA (CHLOROPHYTA)
ABSTRACT:
No heading of Abstract

NON-TOXIC BLOOM OF ASTERIONELLA JAPONICA ON CLIFTON BEACH IN KARACHI
ABSTRACT:
No heading of Abstract