Effect of gamma rays and fast neutrons treatments on tiller number and plant height in wheat
ABSTRACT:
Six cultivars (oak-70, barani70, mixipak, nayab. 6134 X C-271 and H-68) of bread wheat, triticum aesthivum (2n=6x-42- AABBDD) with diversre stability of yield were selected for treatment with gamma rays 6Co. 10, 15 and 20 KR) and fast neutrons (Nf. 300, 450, and 600 RADS) the irritated seeds alongwith respective non-irradiated controls were grown durng 1972-73. Studies on tiller number per unit area and plant height at maturity were undertaken. Analysis of results showed that these cultivars varied significantly for both the characters. Significant treatment effects were observed only for tiller number. However, cultivars X treatments effects were non- significant for tiller number as well as for plant height , indicating a stability of performance across different irradiation teartments. The treatment Nf . 450 RADS showed significantly reduced tiller number as compared wth the control where as other treatments were similar to control in performance of both these characters.

Changes in endogenous hormone activity during parthenocarpic and non-
ABSTRACT:
To obtain information concerning relative activities of native hormones during development of fig syconia in the first (parthenocarpic) and second ( non- parthenocarpic) crops of the king cultivar, the following procedure was tested. It

Investigations into the causes of unproductivity of old world and new world cotton hybrids-2 ( gossypium arboretum) X gossypium hirusutum and 2 ( gossypium arborem) X G. barbadense
ABSTRACT:
Tetraploids of G. arboretum synthesized by colchicine treatment were successfully utilized in crossing with G. hirsutum and G. barbadense. These tetraploids had low pollen fertility 53.8% but gigantic morphologically. Hybrids with constitution (C-4x G. arboretum ) X G . hirsutum and (C-4x G. arboretum X G. barbadense) were obtained successfully and studied cytologically. The backcross studies were under taken but failure in this regard is due to some mechanical and genetic obstacles. The frequency of chromosomes association at the metaphysics-1 was 13, 41 I + 18.55 II and 0.5 III and 14.2 I + 18.1 II and 0.55 III respectively..

The ecology of the native vegetation of kohat, NWFP, PAKISTAN
ABSTRACT:
The vegetation around the shrire of khandezi baba, located at a distance of 2.5 km east of kohat, was sampled and analyzed in the winter of 1974-75. The area, because of the sancity of the shrire remained protected for a long time but has considerably been disturbed in the recent past. Acacia-adhatoda and acacia-malcolmia communities dominated by acacia modesta were

Effects of samazine, atrazine and 2,4-D on repiration rate , sugar level and amylase activity during germination of pinus nigra zar. Calabrica schneid.
ABSTRACT:
The effects of triazines and 2,4-D on the metabolism of germination pinus nigra var. calabrica seeds were investigated . in controls reducing sugsr, respiration rate and amylase activity increased from 30 to 90 h but sucrose level declined. Although simazine did not alter the rate of oxygen update by germinating seeds, 1000 ppm altrazine suppressed the rate of oxygen consumption . at 5 and 100ppm, 2,4-D stimulated the aerobic respiration but 1000 ppm 2,4-D significantly reduced the oxygen uptake of germinating seeds. Trianzines did not change the reducing sugar content but 2,4-D at 100 ppm decreased the reducing asugar content at 30 h and increased it at 1000 ppm. Trianzines (100 and 1000 ppm) initially decreased the sucrose content , but afterwards elevated the

Auxin in zea mays L. coleoptile segments , saturation of absorption and transport at various concentrations
ABSTRACT:
This paper re-examines the effects of various concentartions of indoleacetic acid-2-14C on its absorption and translocation efficiencies. Using zea mays L. coleoptile segments and by considering absorption and translocation as discrete phenomena it has benn found that the maximum efficiency of the tissue is achieved between 0.2-0.4 mg/l

metabolic changes in the regenerating and non- regenerating taraxacum root segments
ABSTRACT:
Metabolic changes in the regenerating and non-regenerating tissues of taraxacum root segments were studied. Early changes in dry weight, proteins, amino acids nuclei acids and a number of enzymes was a result of injury. During regeneration of the root segments, proteins , nuclei acids and enzymes were always at a higher level in the regenerating proximal and distal-end tissues as compared to the non- regenerating tissues. Although the proximal and distal end regenerating tissues were morphologically different yrt there was no difference in the quantity of proteins , nuclei acids, amino acids and enzymes in them.

Some phytotoxic compounds in Italian ryegrass
ABSTRACT:
Phytotoxic compounds of Italian ryegrass were ascertained , with the help of paper chromatography. Some of these toxins were identified as caffeic acid . ferelic acid , syringic acid and vanillic acid. The role of these phytotoxin is discussed.

Inhibition of fungi as affected by oxalic acid production by sclerotium delphini
ABSTRACT:
sclerotium delphini was found to secrete oxalic acid in the medium inhiniting growth of fungi conidia of trichoderma spp. Produced inflated vesicles and chowed lysis where as gliocladium raseam, fusarium solani, F. oxysporum , coniothyrium minitans , potrytis elnera and mucor sp. . did not germinate at all. The metablic produced by S.delphini may be important in completion with other soil micro-organisms.

Effects of camphor on haploid and diploid cells protomyces inundates
ABSTRACT:
The effect of camphor on haploid and diploid cells protomyces inundates has been studied by using liquid culture method. Camphor reaction of haploid cells or diploid cells was identical and it induced gigas cell forms at different concentration with varying degree of intensity . the gigas cells reverted to normal cell form after subculture. There was no indication that camphor caused mutation of gene that controls sexual compatibility in P. inundates.

Germination of ustilago tritici teliospores on different substrates
ABSTRACT:
Effect of different culture media on germination of freshly collected spores of ustilago tritici was studied . the germination appears to be erratic and independent of vitamin B complex

Diurnal periodicity and the effect of meterological factors on air- borne fungus-flora
ABSTRACT:
Air-borne fungus-flora during may to September 1957 showed hour to hour variations and their pattern of diurnal periodicity also varied from day to day. on the basis of hourly averages of several days data alternaria spores had a major peak at 3 p.m. cereospora spores were maximum in the forenoon whereas hyphal fragments did not show marked variations during 24 hours period. Helminthosporium spores shoed somewhat consistant diurnal pattern being maximum in the afternoon but this pattern was altered, because of a morning peak due to a spore shower on july 20 .long hyaline and brown ascospores appeared in the atmosphere after dew or rain but alternaria spores and hyphal fragments disappeared from the atmosphere shortly after rain.

Histology of the root nodules of melilotus albus and trifolium alexandrinum
ABSTRACT:
The rhizobia entered the root of melilotus albus and trifolium alexandrinum through the root hairs and formed infection threads. The infected root hairs were curled. The infection threads could be seen in the cortex of the root as well as in the bacteroid region of the nodules. Origin of nodules was exogenous in both the plants. The mature nnodule consisted of four regions 1) the nodule meristem