Inhibition by calcium of senescence of detached cucumber cotyledons: effect on ethylene and hydroperoxide production.

The effect of Ca on senescence was followed in detached cucumber (Cucumis sativus L.) cotyledons floating on various solutions in the dark. Compared with those in water, cotyledons in 10(-4) molar CaCl(2) exhibited reduced chlorophyll loss and H(2)O(2) production, reduced and delayed ethylene production, and did not undergo a burst in CO(2) production. In contrast, Mg had little effect on cotyledon senescence, whereas K stimulated chlorophyll loss but did not increase H(2)O(2) accumulation of ethylene and CO(2) production. This reduction in the rate of senescence by Ca could also be achieved by increasing the endogenous levels of Ca in the cotyledons before excision, although the reduction was less than that with Ca in the external solution. The addition of H(2)O(2) to the solutions on which cotyledons were floated stimulated chlorophyll breakdown, but effects on ethylene and CO(2) were not consistent.

[1]  S. Y. Wang,et al.  Influence of calcium and magnesium on ethylene production by apple tissue slices. , 1982, Plant physiology.

[2]  K. Thimann,et al.  The role of ethylene in the senescence of oat leaves. , 1981, Plant physiology.

[3]  M. Choudhuri,et al.  Effects of some oxidants and antioxidants on senescence of isolated leaves of sunflower with special reference to glycolate content, glycolate oxidase, and catalase activities , 1981 .

[4]  J. Thompson,et al.  Simulation of the effects of leaf senescence on membranes by treatment with paraquat. , 1981, Plant physiology.

[5]  R. Dhindsa,et al.  Leaf Senescence: Correlated with Increased Levels of Membrane Permeability and Lipid Peroxidation, and Decreased Levels of Superoxide Dismutase and Catalase , 1981 .

[6]  P. Matile.  Catabolism of chlorophyll: Involvement of peroxidase? , 1980 .

[7]  M. L. Gilbert,et al.  Delayed cotyledon senescence following treatment with a cytokinin; an effect at the level of membranes , 1980 .

[8]  A. Rychter,et al.  Activity of Enzymes Involved in the Turnover of Hydrogen Peroxide during Fruit Senescence , 1979, Botanical Gazette.

[9]  M. Lieberman,et al.  Patterns of ehtylene production in senescing leaves. , 1979, Plant physiology.

[10]  M. Lieberman,et al.  Ethylene as a regulator of senescence in tobacco leaf discs. , 1979, Plant physiology.

[11]  M. Lieberman.  Biosynthesis and Action of Ethylene , 1979 .

[12]  F. Bangerth,et al.  Calcium-Related Physiological Disorders of Plants , 1979 .

[13]  D. Kokkinakis,et al.  Tomato peroxidase: purification, characterization, and catalytic properties. , 1979, Plant physiology.

[14]  M. Kar,et al.  Enhancement of senescence in excised rice leaves by hydrogen peroxide , 1978 .

[15]  C. Frenkel.  ROLE OF REDUCED OXYGEN INTERMEDIATES IN THE ONSET OF SENESCENCE PROCESSES IN FRUIT AND STORAGE ORGANS , 1978 .

[16]  M. Kar,et al.  Catalase Activity in Leaves and Cotyledons During Plant Development and Senescence1)1) Part X of the series "Studies on Leaf Senescence". Supported in part by a Grant from the Council of Scientific and Industrial Research, Government of India to D.M. , 1978 .

[17]  C. Frenkél,et al.  Involvement of hydrogen peroxide in the regulation of senescence in pear. , 1977, Plant physiology.

[18]  F. Bangerth,et al.  The effect of Ca and Mg treatments on the physiology, chemical composition and bitter-pit development of ‘Cox's Orange’ apples , 1976 .

[19]  M. Kar,et al.  Catalase, Peroxidase, and Polyphenoloxidase Activities during Rice Leaf Senescence. , 1976, Plant physiology.

[20]  S. Yang,et al.  Stimulation of ethylene production in the mung bean hypocotyls by cupric ion, calcium ion, and kinetin. , 1976, Plant physiology.

[21]  K. Thimann,et al.  The Metabolism of Oat Leaves during Senescence: I. Respiration, Carbohydrate Metabolism, and the Action of Cytokinins. , 1974, Plant physiology.

[22]  J. Goldthwaite.  Energy Metabolism of Rumex Leaf Tissue in the Presence of Senescence-regulating Hormones and Sucrose. , 1974, Plant physiology.

[23]  A. Leopold,et al.  Deferral of leaf senescence with calcium. , 1973, Plant physiology.

[24]  C. Martin,et al.  The role of protein synthesis in the senescence of leaves: I. The formation of protease. , 1972, Plant physiology.

[25]  P. Gruber,et al.  Microbodies (Glyoxysomes and Peroxisomes) in Cucumber Cotyledons: Correlative Biochemical and Ultrastructural Study in Light- and Dark-grown Seedlings. , 1971, Plant physiology.

[26]  E. Simon,et al.  The Yellowing of Attached and Detached Cucumber Cotyledons , 1967 .

[27]  Johan Bruuinsma.  THE QUANTITATIVE ANALYSIS OF CHLOROPHYLLS a AND b IN PLANT EXTRACTS , 1963 .