• D Mukherjee

      Articles written in Proceedings – Plant Sciences

    • Effect of morphactin on the heteroblastic development and the floral morphogenesis inLycopersicon esculentum

      V K Jain D Mukherjee

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      The growth pattern, leaf morphology and flower development were studied inLycopersicon esculentum Mill. With the increase in concentration of morphactin the height of the plants and the length of the petiole reduced and leaflets of young primordial leaves gradually fused to form simple leaves. The length of the inflorescence axis gets reduced and leads to the formation of composite flowers due to a gradual condensation with the increase in the concentration of this growth regulator. The shedding of flowers, a common phenomenon in tomato plants during first flowering was checked and considerable increase in the number of fruits was observed by lower concentration of morphactin treatment.

    • Sulphur amino acids and free amino acids in cotyledons of germinated seedlings ofAlbizzia lebbeck Benth exposed to different light intensities

      Prem Gupta D Mukherjee

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      Metabolism of sulphur amino acids and free amino acids has been studied in the cotyledons during germination ofAlbizzia lebbeck Benth seeds under different light intensities. Seeds ofA. lebbeck contain a large amount of sulphur amino acids which are rapidly utilised during early stages of germination A similarity in the distribution pattern of amino acids in cotyledon samples raised from different seed stocks is noticed. The level of amino acids was higher in the illuminated samples as compared to dark controls. The higher concentration of asparagine, and SAAII during the seedling growth with the increase in light intensities compared to dark-grown seedlings as well as initial seed sample may indicate the involvement of light-triggered reactions in the synthesis of these metabolites.

    • Metabolic studies inSorghum vulgare Pers. andZea mays L. during seedling growth

      B S Afria D Mukherjee

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      Protein content declined in the endosperm while an increase was noticed in root and shoot of young seedlings ofS. vulgare andZ. mays. Seedlings of both plants in light had a larger pool of α-alanine, leucine-phenylalanine, glutamic acid, aspartic acid, valine, asparagine, serine-glycine and γ-aminobutyric acid than other amino acids. Tyrosine, proline, threonine and tryptophan which were recorded in light could not be detected in dark. Asparagine and glutamine increased with the seedling growth in most of the samples studied. Phosphoenolpyruvate and pyruvic acid constituted the bulk of keto acid pool while succinate, malate and citrate of organic acid pool. Protein content and citric acid level were found higher in light than in dark grown seedlings of both plants. The higher level of PEP and pyruvic acid in young shoots in light and their sharp decline at advanced stages may be due to a shift from C3 to C4 metabolism.

    • Changes in proteins, amino and keto acids in different seedling parts ofCyamopsis tetragonolobus Linn. during growth in light and darkness

      Prem Gupta D Mukherjee

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      Comparative changes in protein, free amino and keto acids have been studied in different seedling parts ofCyamopsis tetragonolobus plants in light and dark. Endosperm recorded higher level of free amino acids in darkness than in light, while a low concentration of protein was exhibited both, in light and dark. The breakdown of soluble protein was more in darkened cotyledon due to higher protease activity. The large increase in the free amino acids in the hypocotyl during seedling growth in the dark may be due to its restricted capacity to incorporate all the amino acids into proteins. Root samples from light recorded higher soluble protein as well as a higher free amino acid pool. α-Oxoglutaric acid (α-oga) was recorded in low levels and at few growth stages in both light and dark. In light raised cotyledon samples, the dominating keto acids are phosphoenolpyruvate and pyruvic acid. Low levels of oxaloacetate in light, like α-oga, indicate its rapid utilization during growth, but its accumulation in the dark may suggest sluggish protein synthesis thus sparing the utilization towards the synthesis of amino acids. Utilization of asparagine and glutamine was also affected in dark.

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