Browsing by Author "Abraham, A T"

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    Biological effects of x-rays on chillies (capsicum annuum l.)
    (Kerala Agricultural University, 1970) Kamaluddin Sahib, M; Abraham, A T
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    Physiological and biochemical basis of degeneration in root (Wilt) affected coconut palm
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1983) Sheela Cherian; Abraham, A T
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    Physiological basis of degeneration in root (wilt) affected coconut palm
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1983) George Tharakan, P A; Abraham, A T
    Several studies on the different physiological aspects of the root (vd.lt) disease have "been carried out and conclusions have been drawn* The present study comprised of estimation of protein, non protein amino acids and cytokinins v“ ' from root, leaf and developing nut from healthy-, apparently healthy and root (wilt) affected coconut palm. The chlorophyll content of leaves was also estimated. The results of the biochemical analysis including a bioassay in the case of cytokinins show that in the root (wilt) affected coconut palms there are alterations or deviations in normal metabolic activities from that of the healthy palms Earlier work done has shown several abnormalities in the physiological functions. The present study has revealed a deficiency of cytokinin, one of the important plant hormones or growth regulator, in the root (wilt) affected palm in addition to reduction in protein and chlorophyll contents. The sites of synthesis of hormone (ie. root tips) are damaged, together with the impairment of the translocation system.
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    Studies on the effect of F,W-450 and 2, 4-D as male gametocides in sesame (Sesamum indicum L.)
    (Division of Agricultural Botany, Agricultural College and Research Institute, Vellayani, 1969) Hariharan, N P; Abraham, A T
    The experiment was conducted to study the effects of F ,W-450 and 2, 4-D as male gamotocldos In sosamo, at throe stages of growth. The concentrations tried were 1S00 ppm., 2000 ppm., 2S00 ppm. and 3000 ppm. in case of F ,W-450 and SO ppm.,100 ppm., 150 ppm. and 200 ppm. in case of 2, 4-D.2, 4-D was highly toxic to the plants at all concentrations. F,W-450 at 3000 ppm. caused treatment shock expressed as marginal scorching of the loaves. Pollen sterility was tested by acotocarmine staining method, by germination of pollen grains in artificial medium and by crossing the control plants with pollen from treated plants. The first stage of application was more effective in inducing pollen ste rility and F,W-450 could induce 73$ ste rility without too much deleterious side effects. The plants treated with F,W-450 wore vigorous in growth. Maximum pollen ste rility was observed on the 9th day after treatment in a ll tho cases. Ovular sterility was judged by crossing the treated plants with pollen from control plants. Sterility was observed with the application of both tho chemicals but the intensity was directly proportional to the concentration of the chemicals.V iability of the seeds was also tested and it was found that the chemicals reduced the percentage of germination. V iability was too much reduced in seeds from plants treated with 2, 4-D. In short resplendent results wore obtained with F,W-450 and it was comparatively a better male gametocide for sesame. Results with 2, 4-D showed that this chemical w ill not bo a successful malo gamotocide in sesame. The never ending enthusiasm of man and tho highly developed nature of his grey matter are mastering the nature in multidirectional fashion. I am optimistic to believe that this experiment w ill add a speck of information to the heap of modern agriculture.
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    Studies on the effect of growth regulators on sesame
    (Kerala Agricultural University, 1970) Hariharan, N P; Abraham, A T
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    Studies on the f2 generation of inter-varietal crosses in rice
    (Kerala Agricultural University, 1983) Achamma Oommen; Abraham, A T
    In the study of the Fa generation of the cross of two improved dryland strains and a locai medicinal variety of rice with two high yielding varieties revealed that all the characters under observation were inherited polygenically. F2 segregants surpassing the higher parental limit in their mean yield were obtained. No significant correlation was observed between yield and plant height, number of tillers, panicle length and 1000 grain weight.
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    Studies on the F3 generation of intervarietal crosses in rice
    (Division of Agricultural Botany, College of Agriculture, Vellayani, 1976) Thomas Mathew; Abraham, A T
    The present study was conducted in the Division of Agricultural Botany, College of Agriculture, Vellayani during the period from March to June 1974. Nine characters in the F3 generation of the intervarietal crosses of rice was studied. The crosses involves three local varieties, Navara, Ptb-28 and Ptb-29 and the two high yielding varieties , Anapurna and Triveni. Correlation of the yield with four characters was also studied. The characters, viz. flowering duration, plant height, total number of tillers, panicle length, grain yield, 1000 grain weight, ear weight and apikelet sterility are inherited quantitatively and are controlled by more than one gene. Spikelet sterility is more in the Anapurna X Navara cross