Antioxidant Efficiency during Callus Initiation from Mature Rice Embryo : GROWTH AND DEVELOPMENT : PROTEINS, ENZYMES AND METABOLISM

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概要

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• The changes in the activities of active oxygen scavenging enzymes and lipid peroxidation during callus formation from germinating mature rice embryo was investigated. Superoxide dismutase (SOD) and catalase (CAT) activities were much lower during callus formation than during seedling growth indicating the declining capacity of the callus tissue to scavenge O^<・-^gt;_2and H_2O_2 respectively. Other H_2O_2-utilizing enzymes such as guaiacol peroxidase (GPOX) and ascorbate peroxidase (APOX) had also much lower activities during the initial period of callus formation than during normal germination but soon these enzyme activities were rapidly enhanced during callus growth but declined during seedling growth. Since H_2O_2 level was quite high in the callus tissue, it is probable that GPOX and APOX are not efficient in decomposing H_2O_2 in this tissue. Water soluble non-protein -SH compounds of which GSH is the major component increased more rapidly during seedling growth than during callus formation. This was reflected by the higher activity of glutathione reductase (GR) in the seedling tissue than in the callus tissue. Al-though peroxide and malondialdehyde did not accumulate during the callus initiation period, the fast decrease in the SOD and CAT activities indicates that during this transition period the tissue has increasing tendency towards an oxidative state because of the weakening of the scavenging mechanism. The cellular environment, thereafter, becomes more oxidizing during callus growth when compared with the normal seedling development in the absence of 2,4-D.

• 日本植物生理学会の論文

著者

• Dey Surjendu

  Department Of Botany Utkal University

• KAR Manoranjan

  Department of Botany, Utkal University

• Kar Manoranjan

  Department Of Botany Utkal University

関連論文

• Antioxidant Efficiency during Callus Initiation from Mature Rice Embryo : GROWTH AND DEVELOPMENT : PROTEINS, ENZYMES AND METABOLISM
• Alterations in the Activities of Active Oxygen Scavenging Enzymes of Wheat Leaves Subjected to Water Stress : ENVIRONMENTAL AND STRESS RESPONSES : PROTEINS, ENZYMES AND METABOLISM
• Structural study of Zr doped PbTiO_3 materials by employing Rietveld method

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