Changes in the Content of Free and Conjugated Polyamines during Lettuce (Lactuca sativa) Growth

2015 ◽  
Vol 63 (2) ◽  
pp. 440-446 ◽  
Author(s):  
Edgar Pinto ◽  
Isabel M. P. L. V. O. Ferreira
Keyword(s):  
Lactuca Sativa ◽  
Conjugated Polyamines ◽  
Free And Conjugated Polyamines

Free and conjugated polyamines during de novo floral and vegetative bud formation in thin cell layers of tobacco

1987 ◽  
Vol 70 (3) ◽  
pp. 453-460 ◽  
Author(s):  
Patrizia Torrigiani ◽  
Maria Maddalena Altamura ◽  
Gabriella Pasqua ◽  
Barbara Monacelli ◽  
Donatella Serafini-Fracassini ◽  
...  
Keyword(s):  
De Novo ◽  
Bud Formation ◽  
Thin Cell Layers ◽  
Conjugated Polyamines ◽  
Cell Layers ◽  
Free And Conjugated Polyamines ◽  
Vegetative Bud

Effect of excessive nitrogen nutrition on free and conjugated polyamines content of leaves and berries of Vitis vinifera L. during their development

OENO One ◽  
1996 ◽  
Vol 30 (3) ◽  
pp. 121
Author(s):  
Laurence Geny ◽  
Michel Broquedis ◽  
Jean-Pierre Soyer ◽  
Jacques Bouard
Keyword(s):  
Vitis Vinifera ◽  
Fruit Set ◽  
Higher Plants ◽  
Nitrogen Nutrition ◽  
Nitrogen Deficiency ◽  
N Nutrition ◽  
Total Level ◽  
Stage Of Development ◽  
Conjugated Polyamines ◽  
Free And Conjugated Polyamines

<p style="text-align: justify;">Nitrogen is the most important element for higher plants, and plant productivity is to a large extend determined by nitrogen nutrition. Effects of nitrogen nutrition on levels of polyamines in leaves and grappes of two vines (Semillon and Sauvignon) are studied at different stages of their development (flowering, fruit set process, veraison and maturity). Two N-fertilizations are compared : N0 (0 kgN/ha/year) and N90 (90 kgN/ha/year). Analysis concerned the total level of nitrogen and polyamines (free and conjugates). Polyamines (putrescine, spermidine, spermine and diaminopropane) were derived by dansylation and analysed by CLHP. The results show that N-nutrition induces major changes in the total level of nitrogen and polyamines in various parts of plants. In all organs, excess of N-nutrition increases the total level of nitrogen. Concerning polyamines, these changes differe according to tissue and stage of development. In flowers and green berries, N-excess increases free polyamines whereas in berries during maturation N-excess increases total level of polyamines and particularly free and wall-bound polyamines. In opposite, in leaves, total level of polyamines increases under N-deficiency. These results reflect different rates of metabolism of polyamines between tissues. They suggest that in berries a restricted polyamines synthesis induced by nitrogen deficiency; whereas in leaves, N-deprivation can induce an accumulation of putrescine as do many others stress. The roles of polyamines in berries and in leaves are discussed.</p>

scholarly journals Relative Changes in Polyamines during Citrus Flower Development

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 946-948 ◽  
Author(s):  
Mosbah M. Kushad ◽  
Andrea R. Orvos ◽  
George Yelenosky
Keyword(s):  
Flower Development ◽  
Citrus Sinensis ◽  
Developmental Stages ◽  
Reproductive Organs ◽  
Flower Buds ◽  
Conjugated Polyamines ◽  
Polyamine Content ◽  
Flower Growth ◽  
Stage 1 ◽  
Free And Conjugated Polyamines

Several stages of citrus (Citrus sinensis L. Osbeck. cv. Valencia) flowers, from very small bud (stage 1) to anthesis (stage 6), were evaluated for free and conjugated polyamines. The concentration of putrescine and spermidine synthesis increased markedly during the early stages, and then declined as the flower buds grew. At anthesis, putrescine and spermidine concentrations had increased significantly. Spermine concentration was very low and showed no significant change during the first three floral developmental stages; however, by stages 5 and 6, spermine concentration showed a slight but significant increase. Eighty percent of the total polyamine content in fully developed flowers is localized in the reproductive organs and only 20% is localized in the petals and the calyx. This study relates changes in conjugated and free polyamines to citrus flower growth.

Oxidative stress and fluctuations of free and conjugated polyamines in the halophyte Mesembryanthemum crystallinum L. under NaCl salinity

2006 ◽  
Vol 50 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Nina I. Shevyakova ◽  
Victor Yu. Rakitin ◽  
Larisa A. Stetsenko ◽  
Evgeniya E. Aronova ◽  
Vladimir V. Kuznetsov
Keyword(s):  
Oxidative Stress ◽  
Mesembryanthemum Crystallinum ◽  
Nacl Salinity ◽  
Conjugated Polyamines ◽  
Free And Conjugated Polyamines
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