SEASONAL EGG LIBERATION AND POTENTIAL OUTPUT OF HORMOSIRA BANKSII
ABSTRACT:
Seasonal variation and potential output of egg liberation in the fucalean species Hormosira banksii (Turner). Decaisne was investigated. Eggs were produced throughout the year but the reproductive capacity was seasonal. A good liberation of eggs was observed from July-October (winter to early spring) when the mean sea water temperature was 14oC where eggs produced were healthy, morphologically as well as physiologically and fertilization in the laboratory showed a high synchrony. Liberation of eggs was low at high temperature (17.5-22oC)during December to February and most of the eggs were apparently not healthy often disintegrated when released from the conceptacles and viability of the eggs was also low with abnormal growth.

PEDIASTRUM BAREILLIANSIS A NEW SPECIES IN INDIA
ABSTRACT:
Pediastrum bareilliansis sp. nov., collected from Dhopa pond, Bareilly District, U.P India is described.

OCCURRENCE OF ALGAE IN INDUSTRIAL WASTE WATER AROUND KARACHI
ABSTRACT:
Waste water samples of Korangi industrial and SITE areas showed the occurrence of 43 algal species belonging to 39 genera and 4 divisions, in which Mycrocystis flos-aquae, Phormidium purpurascens and Chlamydomonas oblonga were dominant. This is the first report of the occurrence of Chryosophyta from Pakistan.

Effect of vegetative incomtibility on double stranded RNA and mycovirus transmission In gaeumannomyces graminis var. tritici
ABSTRACT:
The vegetative incompatibility of gaeumannomyces graminis ( wheat plant pathlogen) was examined by physical interacrion of field isolates on potato dextrose agar. Due to multi-alaelic system 31 isolates of gaeumannomyces graminis var. tritici. Were divided into 18 vegetative incvompatibility (V.C) groups. The genetic mechanism of of somatic incompatibility appears to be heterogenic . fusion incompatibility was rarely found. The dsRNA components from these isolates belonged to different V-C group e.g. 38 (V- Cgroup A) and 43 (V-C group B) are of the same size. Similarly dsRNA components from isolates 87-1 ( V-Cgrouop F) and isolates 83 (V-C group G) have same size range . the close similarity of the dsRNA present in isolates from diferetn V-C group suggests that somatic incompatibility cannot restrict the ransmission of virus or viral genome (dsRNA ).

Seed-borne mycoflora of coriandrum sativum L.
ABSTRACT:
Seed samples of coriander from 15 countries were analysed for seed-borne mycoflora . of the 88 sasmples examined , 14 genera and 24 species of fungi were

Detection of the seedborne mycoflora of sunflower
ABSTRACT:
Using blotter , agar plate and deep-freezing methods as recommended by ISTA , the seedborne mycoflora of sunflower was shown to consist of 20 different genera 36 species of fungi . more fungi were isolated by the blotter method followed by agar plate and the deep-freezing method. Variety HO-1 showed highest fungal colonization among the 20 samples testd. The pathogenic species included rhizoctonia solani Kuhn, macrophomina phaseoline (tassi) goid, fusarium moniliforme Sheldon , F. solani(mart). Appel and wollenw,, F/semitectum berk. And Rav., F. equiseti (corda ) sacc., drechslear state of cochliobohus spicifer nelson , alternaria alternate (Fr) keissier , A. teruissima ( kunze

Effect of microbial antagonisis in the control of root rot of tomato
ABSTRACT:
Seed treatment with microbial antagonisis viz., trichoderma harzianum , gilocladium virens , paecilomyces lilacinus , rhizobium meliloti and Streptomyces sp., completely controlled infection of tomato rots by fusarium oxysporum in 30 and 120 day old plants. Against macrophomina phaeolina the effectiveness of microbial antagonisis declined with time and only gliocladium viruses was able to reduce M. phaseolina infection after 120 days of treatment . higher germinated of seeds, fresh weight , shoot length and plant lengt at all intervals as compared to control was observed in paecilomyces lilacinus and rhizobioum melilotic treatments followed by glicladium virens , trichoderma harziaderma and Streptomyces sp.

Effect of seed treatment with biological antagonisis on rhizosphere mycoflora and root infecting fungi of soybean
ABSTRACT:
Treatment of soyean seeds with paecilomyces lilacinus , trichoderma harzianum , glicladium virens , bacilhus subtilis , rhizobium metolic and Streptomyces sp., showed significant reduction in infection of root by root infecting fungi on 30 and 60 day old palnst . the effectiveness of microbial antagonisis

Analysis of resistance I sunflower to charcoal rot pathogen macrophomina phaseolina
ABSTRACT:
Four sunflower hybrids viz., NK-212 , Cargill- 204 , SF-100 and hysun-30 were tested for disease resitance against 26 isolates of macrophomina phaseolina collected from sunflower growing areas in Pakistan. Stem inoculations were made using a tooth-pick and spread of charcoal rot was measured from the point of inoculation. Disease reaction was scored on a 0 to 5 scale ; where 0= no rot and 5= plant death. Resistance was characterized using analysis of variance . a highly significant main effect for both varieties and isolates was detected . this indicated a highly significant difference in horizontal resistance between varieties and in aggressivieness between the isolates however, the interaction varieties x isolates was nosignificant , indicating no evidence of vertical resistance.

Biological control of rot rot disease of mustard
ABSTRACT:
Infections of macrophomina phaseolina on 30 day old mustard 9 brassica juncea ) seedling was inhibited by brodyrhizobium japonicum , trichoderma harzianum , glicladium virens and paecilomyces bilocinus when used as seed decreasing or as soil drench , while on 60 day old palnts.

Error free repair of alkylated DNA in staphylococcus aureus
ABSTRACT:
The adaptive repair activity has been demonstrated in cells of straphylococcus aureus, reactivation of alkylated phage p68 has been shown to be dependent upon the host cell coded adaptive repair enzymes of the adapted S. aureus cells. In vitro biochemical studies have indicated the nitroguanidine (MNNG) adapted synthesis of al;kyltransferase . however, DNA glycosylase activity has been insignificant.

IB/IR translocation wheat ciltivars detected by A-page electrophoresis and C- banding in the 1990 national uniform wheat yield trial in Pakistan
ABSTRACT:
Bread wheat (triticum aestivum L.) yield trial nurseries comprised of a large proportion of lines with the IB/IR translocation that has associated with it sesveral positive agronomic and pathological attributes . thirty eight entries were evaluated in three categories (i.e. normal , short and rainfed) in the 1989-90 national uniform wheat

Production and cytogenetics of intergeneric hybrids of triricum aestivum with aegilops variabilis and AE. vavilovi
ABSTRACT:
Intergeneric hybrids between triricum aestivum L., and karnal bunt ( neovossia indica) resistant accessions of two aegilops spaecies were produced in different frequencies . aegilops variabilis was hybridized with genaro 81, Mri-buc “S”. Buc-pvn “S” and chineese spring at frequencies of 5.0 to 29.0 % . the endosperm formation was normal , mature seeds were slightly shriveled but germinated normally . the T. aestivum x Ac . variabilis hybrids , genomically represented as ABDUS , were cytologically normal , with 2n=5x=35 chromosomes . the mean meiotic association at metaphase-1 were categorized as low pairing and expressed as 33.96 univalents + 0.52 rod bivalents over 56 meiocytes analysed with a 0.52 mean chiasmata frequency . hybrid

Effect of salinity on growth and nutrient content of pearl millet grown in desert sand and gravel
ABSTRACT:
Sand or gravel culture techniques were used ti study the effect of saline irrigation water on the growth and nutrient contents of pearl milles . plant height and dry matter yield significantly decreased with increase in salinity levels. Salinity caused an increase in N.P, Ca , Na , Fe, and Mn and decrease in K content of the leaves.

Total phenolics , phenyl alanine ammonia lyase and polyphenol oxidase in in vitro calli of chick-pea
ABSTRACT:
Conditions for in vitro cultures of calli from root , cotyledon and hypocotyl explants of chickpea (cicer ariethinum L. cv CM 72) in M.S. medium were established . total phenolics , phenylalanine ammonia-lyase (PAL) and polyphenol oxidases (PPO) were estimated quantitatively from main callus to 6th sub-culture . the activity of PAL and PPO showed a linear increase upto third sub- culture and then a remarkable decrease from fourth to sixth sub-culture was observed . the data of phenolices was not

Siderinium pitensis sp. Nov., a new species of silicified fossil dicot wood from tertiary deposits of Sindh , pakistan
ABSTRACT:
Siderinium pitensis sp. Nov a new silicified stem fossil is described from tertiary rocks of dada dormation exposed near ranikot fort area , district dadu , Pakistan . the xylotomical features of the present fossil wood show close affinities with the genus sideroxylon of the family sapotaceae.

Composition and variation of essential oil constiuents in three menthal ., ) labiate) species in Yugoslavia
ABSTRACT:
The essential oil components piperitone , linalool, menthol , geraniol , limonene, carvone, pulegone , caryphyllene , menthone , isomenthone , meoismenthone , P. cymene , borneol , piperitnone an a terpinene were determined by GL.C in 3 wild species of the genus menthe collected from the river Danube ravine north east of Yugoslavia . considerable variation was observed among some essetntial oil components ; commercially this variation could be useful.

Some autecolological observations on catharanthus roseus (L.) G.DON
ABSTRACT:
Germination and growth of catharanthus roseus seeds were found directly related to temperature. Scartification of seeds retarded germination and growth of seedlings . germination and growth of seeds soaked in water at 300 C for 2h significantly increased in longer incubation periods . C roseus was extremely sensitive to salinity . loam soil gave maximum germination and growth . partial sunlight and complete

Contribution to the flora of Saudi Arabia part II. A revision of the family solanaceae
ABSTRACT:
The family solanaceaea in the kingdom os Saudi Arabia has been revised . it is represented by 43 taxa distributed in 11 genera (including 12 cultivated species ).. two new status viz., solanum incanum L. var. uniguicularum (A. Rich ) abedin , al-yahya, chaudhary and mossa and withania somnifera (L.) dun subsp obrusfolia (Tackh.) abedin , al-yahya, chaudhary and mossa has been suggested and five taxa recorded for the first time are solanum augivi Lam., S. cordarum forsk ., Sekeagiifollium Cav., withania somnifera (L) dun. Subsp,obrusfolia (Tackh). Abedin , al-yahya, chaudhary and mossa and datura ferox L. there is an increase of 5 genera with 27 taxa and 6 genera with 22 taxa respectively against previous reports (migahid, 1978; collenatte, 1985). Key to genera, species their descrptions and geographical distribution are given .

Anti-page Mu activity and mutagenicity of extra cellular peptides of candida tropicalis
ABSTRACT:
Genetic activity of peptides isolated rom cell-free culture filterate of dimorphic yeast candida tropicalis (strain CBS94) was investigated in salmonella/ microsome revesion assay . the peptides induced either base-pair substitutions or frame-shift mutagenesis and one of this promoted both kind of mutations. A peptide also inhibited Mu induced lysis of Escherichia coli, indicating that the peptide could interfere with the growth of a bacterial

A new species of rochelia (boraginaceae) from pakistan
ABSTRACT:
While studying the rochelia material for the flora of Pakistan , one gathering namely Bowes lyon ,789, from chitral could not be matched entirely with any of the species found in Pakistan. The gathering was tentatively placed under R. laxa. On further examination this gathering proved to ba a new species.