AHMED,JAMIL (1934-1992) - OBITUARY
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KHAN,SHAKIL,AHMED (1932-1992) - OBITUARY
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AFZAL,MIAN,MUHAMMAD (1902-1991) - OBITUARY
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TYPES AND OCCURRENCE OF TRICHOMES IN 2 SPECIES OF THE GENUS LAVANDULA (LAMIACEAE) .2. L-STRICTA DEL, AND L-CORONOPIFOLIA LAM
ABSTRACT:
The morphology and types of trichomes on the leaves, stems and floral parts of Lavandula stricta Del., (= L. coronopifolia Poir.) and L. coronopifolia Lam., were investigated. Both the species showed nonglandular trichomes with cells having warty walls. The two species also have glandular trichomes with unicellular, bicellular or multicellular heads. Nonglandular trichomes with smooth cell walls and branched glandular trichomes were not observed in L. coronopifolia. ne trichomes of the two species could be grouped into 8 types comprising of 17 forms of nonglandular and 13 forms of glandular trichomes.

STRUCTURAL STUDIES ON ROOT-NODULES OF LEUCAENA-LEUCOCEPHALA WITH PARTICULAR REFERENCE TO THE INFECTION PROCESS
ABSTRACT:
Rhizobial infection on roots of Leucaena leucocephala started with curling and deformation of root hairs. Infection threads were seen in the young infected cells travelling both inter and intracellularly. Bacteroid region of the nodule composed of both the infected parenchymatous cells and uninfected interestitial cells. Two types of infected cells viz., young vacuolated cell and older non vacuolated cells with deformed nuclei were observed in the developing nodules. Both determinate and indeterminate nodules were observed in L. leucocephala.

RESPONSE OF LEUCAENA-LEUCOCEPHALA TO INOCULATION WITH RHIZOBIA FROM TROPICAL LEGUMES
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Rhizobia isolated from root nodules of Albizia lebbeck, Arachis hypogaea, Clitoria ternatea, Leucaena leucocephala, Medicago sativa, Pithecellobium dulce, Sesbania sesban and Vigna unguiculata were tested for their ability to produce root nodules on Leucaena leucocephala. Amount of fixed N2 was measured. Except Arachis hypogaea isolates from all leguminous plants produced nodules on L. leucocephala. Isolates from V. unguiculata, A. lebbeck and P. dulce were most effective in nitrogen fixation and induced substantial increase in dry weight and nitrogen contents of the host plant.

PRIMARY VASCULAR ORGANIZATION OF TESSARIA-ABSINTHIOIDES (COMPOSITAE)
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The primary vascular system of the shoot of Tessaria absinthioides was studied by the use of serial cross sections. It is a system of the open type, with eight sympodia, 2/5 helical phyllotaxy and trilacunar three-trace nodes. All the bundles are interpreted as leaf traces diverging towards the left along a sinistrorse genetic spiral. Leaf insertion is of the separated type and there are two sets (2 + 3) of contact parastichies in the apex. The phylogenetic implications of these characters are discussed.

POLLEN EMBRYOGENESIS IN THE CULTURED ANTHERS OF NICOTIANA-TABACUM CV VIRGINICA OBTAINED FROM INVIVO AND INVITRO PRODUCED FLOWER BUDS
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The performance of anthers from in vitro produced flower buds and those derived from glasshouse-grown plants was compared. In liquid medium anthers of all types exhibited some degree of browning. In vivo produced anthers were moderately prone to browning irrespective of the presence or absence of hormones in the culture medium. Browning in anthers derived from in vitro produced flower buds was far more in hormone-free media. The anther response based on the number of anthers incubated was much higher in hormone free media than in the media containing hormones. In vitro produced anthers exhibited a strong dependence of anther response to the stage of pollen development at excision. The productivity of the in vitro produced anthers was greater in the hormone supplemented media whereas the in vivo produced anthers did so in the basal medium.

PHYLOGENETIC STUDY OF DAMPIERA SPECIES BY WAGNER TREE ALGORITHM
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The Wagner Tree algorithm was used as an aid in estimating the phylogeny. Using 15 multistate attributes, 66 species of Dampiera were analysed in a numerical phylogenetic study. During the construction of the Wagner Tree or network no weighting of attributes was undertaken. The polarity of attribute states was also not determined, except for 6 attributes in which primitive states were suggested. However, in most cases, the attribute states were arranged in possible logical transformation series. A diagram showing the probable phylogenetic relationship of Dampiera species has been developed, in view of primitive characters, found in the species. It is suggested that the root of the phylogenetic tree is somewhere at the junction of Sect. Dicoelia and Sect. Dampiera.

PRELIMINARY EVIDENCE FOR SPECIFICITY BETWEEN FACTORS CONTROLLING LATENT PERIOD IN WHEAT CULTIVARS AND BROWN RUST ISOLATES
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Latent period was measured in number of days from inoculation to flecking and sporulation in five bread wheat cultivars inoculated with 25 isolates of Puccinia recondita Rob. ex Desm. A differential interaction between the cultivars and the parasite isolates indicated the presence of genetic specificity between factors controlling latent period in both the host and the parasite. Depending upon the host: parasite combination. differences of one to two days were observed in the latent period required by brown rust under the conditions of this study.

ISOLATION AND CHARACTERIZATION OF SOME VIRUSES ASSOCIATED WITH WHEAT PATHOGEN GAEUMAN-NOMYCES-GRAMINIS VAR TRITICI
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Isometric virus particles measuring 3540 nm in diameter with double stranded RNA genomes of molecular weight (1.48 - 6.1) x 10(6) dalton was detected in the field isolates of the wheat take all fungus Gaeumannomyces graminis var. tritici. Out of three isolates of Ggt four different viruses based on particle size, size of RNA and molecular weight of coat protein belonging to three groups of mycoviruses were detected.

INFLUENCE OF GROWTH-REGULATORS, COBALT AND SILVER IONS ON FRUIT DROP IN MANGO (MANGIFERA-INDICA L)
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Pre-mature fruit drop decreases mango yield. The effect of aqueous sprays of 1-naphthaleneacetic acid (NAA), gibberellic acid (GA3), silver nitrate (AgNO3) or cobalt nitrate [Co (NO3)2], alone or in combination, on fruit retention in mango (cv. Sindhri) was studied. Spray was done : once when fruitlets were of pea-size and then two weeks later when fruitlets increased to marble-size. Compared to control, applications of Co (100 mg/L), Ag (100 mg/L) ions, NAA (20 mg/L) and GA3 (50 mg/L) enhanced fruit retention by 131,127. 100 and 50%, respectively. No additive effect was observed when these chemicals were sprayed in combination.

EFFECT OF HEAT-SHOCK TREATMENTS ON SOME BIOCHEMICAL PARAMETERS IN DIFFERENT VARIETIES OF SOYBEAN (GLYCINE-MAX)
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The present study was undertaken to screen the thermotolerant varieties of soybean and analyse the changes brought about by heat shock conditions in least resistant variety. Four varieties of soybean viz., Williams, Chippewa, S-73 and Improved Pelican were subjected to 7 different heat shock conditions. 'Chippewa' was found to be the most theremotolerant and 'Williams' was the least. It was observed that 45-degrees-C-2 h had lethal effect on growth of soybean seedlings. A short pulse of 10 minutes at 45-degrees-C triggers the synthesis of some heat shock proteins which were accumulated at 45-degrees-C-2 h and then gradually decreased during recovery period. Altered levels of RNA, DNA, total phenols and anthocyanins were also observed in cv. Williams. An increase in temperature had adverse effect on growth however, Hsps-induced during shock may help in the recovery of growth and provide thermal tolerance in soybean seedlings.

EFFECT OF SODIUM-CHLORIDE ON GROWTH AND NODULATION OF SESBANIA-SESBAN
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Growth and nodulation of Sesbania sesban were compared at eight levels (0-2.0%) of NaCl salinity in sandy clay loam soil (ECe: 1.0 dS m-1). Dry weight of shoots and roots and number of nodule per plant decreased with increasing salinity levels. Nodule dry weight, however, increased at low levels of salinity (0.1% and 0.2% NaCl) and decreased at higher levels. Maximum diameter of nodules increased at all the salinity levels except in 2% NaCl. The decrease in nodule numbers was partially compensated by an increase in nodule size.

PEDIASTRUM-HABIBII SP-NOV, AN INTERESTING NEW ALGA
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A new species of Padiastrum Mayen (Chlorococcales, Chlorophyta) has been described from India. The collection was made during November 1990 from Shankha river, Bareilly district, Uttar Pradesh, India. Pediastrum habibii sp. nov. consists of 15 cells only with inner cells having inter cellular spaces in between them

EFFICACY OF TRICHODERMA SPP, AND RHIZOBIUM-MELILOTI IN THE CONTROL OF ROOT-ROT OF FENUGREEK
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Trichoderma viride, T. hamatum and Rhizobium meliloti used as seed dressing and or as soil drench reduced Macrophomina phaseolina infection by more than 50% on 30 day old fenugreek seedlings. Combined use of T. koningii and R. meliloti showed better control of M. phaseolina infection on both 30 and 60 day old plants. T. harzianum, T. hamatum, T. pseudokoningii and R meliloti (KUMH 555 & KUMH 653) used either as seed dressing and or as soil drench completely controlled the infection of Rhizoctonia solani both on 30 and 60 day old plants. Combined use of T. viride and T. koningii with rhizobia were also found effective. T. harzianum, T. koningii alone or R. meliloti used with T. viride, T. hamatum, T. koningii and T. pseudokoningii completely controlled the infection of Fusarium spp., on 30 day old seedlings, while in 60 day old-plants more than 50% reduction was found by Trichoderma spp., and R. meliloti used alone or rhizobia mixed with Trichoderma spp., when used either as seed dressing and or as soil drench.

A PRELIMINARY-STUDY ON THE SELF INCOMPATIBILITY AND FRUIT SETTING ABILITY IN SWEET-POTATO (IPOMOEA-BATATAS (L) LAM)
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DETECTION OF BARLEY YELLOW DWARF VIRUS IN PAKISTAN
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