Accumulation of free amino acids in the tips of non-thermodormant embryonic axes accounts for the increase in the growth potential of New York lettuce seeds

1980 ◽  
Vol 21 (8) ◽  
pp. 1639-1644 ◽  
Author(s):  
G. Takeba
Keyword(s):  
Amino Acids ◽  
New York ◽  
Free Amino Acids ◽  
Free Amino ◽  
Growth Potential ◽  
Embryonic Axes ◽  
Lettuce Seeds

scholarly journals INCREASED PEROXIDATIVE DAMAGE AND DECREASED PROTEIN SYNTHESIS ARE FEATURES OF AGING POTATO SEED-TUBERS.

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 623g-624
Author(s):  
G.N.M Kumar ◽  
N.R. Knowles
Keyword(s):  
Amino Acids ◽  
Protein Synthesis ◽  
Free Amino Acids ◽  
Free Amino ◽  
Seed Tuber ◽  
Growth Potential ◽  
Potato Seed ◽  
Root Growth Potential ◽  
Peroxidative Damage ◽  
Seed Tubers

The physiological mechanisms leading to a decline in sprout-vigor, root growth potential and apical dominance during long-term aging of potato seed tubers are currently under investigation. Malondialdehyde (MDA) and ethane, products of peroxidative degradation of PUFA increase in seed-tuber tissues with advancing age (from 2 to 32 months of storage). MDA is known to react with free amino acids to produce lipofuscin-like fluorescent compounds (FC), which build-up in aging/senescent tissues of plants and animals. With advancing seed-tuber age, an increase in free amino acids, MDA and FC concentrations was evident. Moreover, high levels of MDA have been shown to reduce protein synthesis in both plant and animal cells. We therefore examined the extent to which seed-tuber age affects protein synthesizing capacity of tuber tissues during sprouting. Tissue disks from 6- and 18-mo-old seed-tubers at various stages of sprouting, were compared for their protein synthesizing ability by monitoring the incorporation of radiolabelled amino acids into TCA precipitable products. The rate of incorporation (dpm mg protein-1 min-1) was 1.8 to 5.4-fold higher in tissue from 6-mo-old, as compared to that from 18-mo-old seed tubers, at similar stages of sprout development. Loss in protein synthesizing ability (possibly due to direct peroxidative damage) may be an important factor contributing to loss of sprout-vigor from aged potato seed-tubers.

Betaines and free amino acids in salt stressed vitroplants and winter resting buds of Populus trichocarpa x deltoides

1991 ◽  
Vol 83 (1) ◽  
pp. 136-143 ◽  
Author(s):  
L. Bray ◽  
D. Chriqui ◽  
K. Gloux ◽  
D. Le Rudulier ◽  
M. Meyer ◽  
...  
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Populus Trichocarpa

Plasma and skeletal muscle free amino acids in type I, insulin-treated diabetic subjects

Diabetes ◽  
1985 ◽  
Vol 34 (8) ◽  
pp. 812-815 ◽  
Author(s):  
L. Borghi ◽  
R. Lugari ◽  
A. Montanari ◽  
P. Dall'Argine ◽  
G. F. Elia ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Type I
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