Studies in the family gentianaceae: the genus aloitis rafin . from Pakistan and Kashmir.
ABSTRACT:
The genus alotis rafin . is recognized from Pakistan . six new combinations are proposed : A. falconeri (Clarke) omer. Qaiser and ali ; A. maddeni (Clarke) omer , qaiser and ali ; A. moorcroftiana ( wall ex G. don) omer., qaiser and ali ;A. umbellate (M.bieb0. omer , qaiser and ali A. holosteoids (Pritchard) omer, qaiser and ali and A. stoliczkai (Clarke) omer, qaiser and ali.

A palynologocal study of the family gramineae from Karachi- pakistan.
ABSTRACT:
A palynological study of 64 species belonging to 40 genera of the family gramineae from Karachi was conducted . the family is stenopalynous and the pollen are spheroidal , usually monoporate, rately diporate, smooth , mostly annulate and operculate . on the basis of sculpturing pattern 3 groups are recognized viz, (i) areolate, (ii) scabrate (iii) scabrate-areolate. Each group is further divided on the basis of proximity of the granules (scabrae). Various quantitative characters were also statistically tested.

A contribution to the chromosome numbers of compositae from pakistan
ABSTRACT:
Chromosome counts are reported for 32 species belonging to 23 genera (in 8 tribes) of the family compositae from Pakistan . of these, counts for 4 taxa viz, lactuca remotiflora DC, pluchea arguta boiss ., puliccaria boissieri hook , f. and pulicaria hookeri jafri are new to science.

Cytological investigation ib abutilon mill., from pakistan
ABSTRACT:
Chromosome numbers are reported for 12 species of abutilon mill, from Pakistan of which four species are cytologically investigated for the first time viz., A. alii S. abedin (n=21), A. figarianum webb (n=21), A. karachianum S.A. hus. & S.R. Baq .(n=21), and A. pakistanicum jafri and Ali (n=21,2n=42)

Investigation of genotype X environment interaction for seed yield in chickpea ( cicer arietinum L.)
ABSTRACT:
The stability analysis in 14 genotypes for seed yield of chickpea was response of G X E interaction was evaluated . the linear component of interaction was more important than non linear component. CM 72 and C 44 , being high yielding and less susceptible to the changes in the environment, were found to be most suitable and adaptable genotypes.

Allelopathic potential of senesced anthers of bombax ceiba L., inhibiting germination and growth of lettuce seeds
ABSTRACT:
Aqueous extracts ant leachates from senesced anthers of bombax ceiba L., was tested for its effect on seed germination and seedling growth of lettuce . the inhibitors isolated from anthers were water soluble and its germination inhibiting activity increased with rise in temperature from 20+- 1 to 26 +-20C. paper chromatographic separation of acidic ethyl acetate fraction of the aqueous

Phytotoxicity of silybum marianum gaertn ., on wheat
ABSTRACT:
Allelopathic effect of Silybum marianum gaertn , was studied in laboratory and field experiments . the aqueous extracts from different plant parts sognificantlt inhibited seed germination and radicle growth of triticum aestivum L. cv. Blue silver . the toxicity varied from part to part and was related to concentration , soaking duration and the freshness of the plant material assayed . stem exudates were highly toxic followed by leaves, inflorenscence and the roots. Leachates from fruit and fruit parts did not show toxicity . interference test confirmed the capability of weeds in relating the growth of wheat in mixed roots cultures. In field , decomposing litter from S. marianum showed significant reduction of height , length of 3 top intermodes , length of earhead . dry biomass and number of grains per earhead of wheat.

Effect of GA3 on shoot proliferation in different date palm varieties.
ABSTRACT:
Shoot tips excised from apical and axillary buds of date palm varieties dhakki, khudrawi and zahidi showed shoot proliferation on MS medium supplemented with GA3 where complete plantlets were obtained only in cv., dhakki.

Physiological differences in germinating wheat seeds due to seed source
ABSTRACT:
Seedlings of 18 winter wheat cvarieties produced at 2 distinctly locations, were compared for physiological differences during germination . varities were significantly different (P=0.01) from each other for seeding axes weight , alpha- amylase and glutamine synthetase activities and soluble protein of seedling axes and endosperm. Corvallis source seed was superior to moro source seed for seeding axes weight and endosperm soluble protein while the reverse was true for alpha-amylase and glutamine synthetaes activities , and seeding axes soluble protein . enzyme activity increased in moro source seed due to environmental stress but corvallis source seed was better for total and soluble reserves in the endosperm . higher quantity of total and soluble protein in the endosperm over- shadowed the benefit of better enzyme activity for seedling growth . both genotype and environment affected the seed physiological properties . the interaction between varieties and seed source was significant.

Seed-borne mycoflora of trigonella foenum-graecum L.
ABSTRACT:
Seed samples of trigonella foenum- graecum (fenugreek) obtained from 7 countries were analyzed for seed-borne mycoflora . of the 23 samples examined , the samples from Pakistan showed maximum infection of seed-borne fungi alongwith unidentified yeasts and bacteria . fungi isolated were : alternaria alternaria ,

Etection and location of seed- borne fungi in sorghum sed.
ABSTRACT:
Using ISTA techniques , 27 species of fungi were isolated from 6 varieties of sorghum seed. Deep freezing method was found superior to the standard blotter and agar plate methods for the detection of fusarium spp., drechslera spicifera and curvularia lunata. Seed components showed infection of alternaria alternata , curvularia lunata , drechslera spicifera , D. hawaiiensis , fusarium moniliforme and F. semitectum but F. moniliforme was frequently recorded in the embryo.

Inactivation of sclerotia of macrophomina phaseolina under paddy cultivatin
ABSTRACT:
Viability of sclerotia of macrophomina phaseolina was examined in field under paddy cultivation for two consecutive years. After 12 weeks sampling, number of sclerotia were eliminated from surface and 20 cm depth at rice research

Spore survival , germination and sporeling growth of penicillium expansum in soil
ABSTRACT:
Conidia of penicillium expansum did not germinate in natural soil but remained viable (68%) for upto at least one year . in autoclaved soil, however, conidia germinated to develop and form conidia microcyclically.

Antifungal properties of plant leaf decoctions against leaf rust of wheat.
ABSTRACT:
Leaf decoctions of 16 phanerogams were tested against leaf rust of wheat. Decoctions of acacia nilotica, calatropis procera, datura stramonium , dodonaea viscosa and rhazya stricta effectively controlled the rust on detached leaves of wheat whereas cassia senna enhanced germination of urediniospores.

Assessment of possible mutagenicity of betel leaf in saccharomyces cerevisiae
ABSTRACT:
Aqueous extract of betel leaf was tested for the induction of mitotic gene conversion, mitotic crossing over and reverse mutation in diploid strains of saccharomyces cerevisiae . tests performed with stationary and log phase cells showed that betel leaf extract was non-mutagenic in yeasts without metabolic activation . it failed to increase the frequency of convertants , recombinants and revertants. Betel leaf extract neither caused cell killing nor inhibition of cell divisions . EMS, used as control , exhibited mutagenic and recombinogenic activity.

The effect of carbetamide herbicide on pigment contents , carbohydrate and nitrogen levels and 14CO2 – photoassimilation in chlorella vulgaris
ABSTRACT:
Treatments of chlorella vulgaris with carbetamide (-1-(ethylcarbamyol) ethyl phenyl carbamate) induced changes in pigment content , 5 ppm showed considerable increase in pigment content , when 25 and 50 ppm induced bleaching after 5 and 7 days , respectively . thereafter , a remarkeable re-greening of these cultures was observed . carbetamide treatment reduced carbohydrate components associated with an increase in nitrogen component at high concentration of the herbicide. Carbeta mide induced changes in the pattern of 14CO2-photoassimilation. A significant increase in the ratio of soluble/insoluble products was obtained , this being indicative that the rate of transformation of soluble to insoluble photosynthates

A platymonas bloom in coastal waters of Jeddah , Saudi arabia
ABSTRACT:
A dense greem bloom of platymonas intermedia nasr was observed in coastal waters of Jeddah , Saudi Arabia in close vicinity to the point of discharge of city’s sewage with cell counts as hih as 38 million cells/I. the species appeared to be first record from the red sea area bordering Saudi Arabia.

Distribution of and some ecological notes of phaeophyta from the coast of karachi
ABSTRACT:
During taxonomical and ecological survey of phaeophyta from the coast of Karachi, 17 genera and 48 species including 10 genera and 29 species as new records were found in Ectocarpales , dictyotales , punctariales and fucales. Members of dictyotales were predominant.

Some algal microfossils isolated from sonda coal deposits , thatta district , sind, pakistan
ABSTRACT:
Unicellular , colonial and filamentous forms of algae represented by cephalia globate, coelastrum cambricum , dinogymnium acuminatum , pinnularia denticulate . sp. Nov., stichococcus bacillaris, myxococcoides muricata and synechococcus aeruginosus chaetomorpha akineta sp.nov.,