scholarly journals Change in Content of Sugars and Free Amino Acids in Potato Tubers under Short-Term Storage at Low Temperature and the Effect on Acrylamide Level after Frying

2005 ◽  
Vol 69 (7) ◽  
pp. 1232-1238 ◽  
Author(s):  
Akiko OHARA-TAKADA ◽  
Chie MATSUURA-ENDO ◽  
Yoshihiro CHUDA ◽  
Hiroshi ONO ◽  
Hiroshi YADA ◽  
...  
Keyword(s):  
Amino Acids ◽  
Low Temperature ◽  
Free Amino Acids ◽  
Free Amino ◽  
Potato Tubers ◽  
Short Term ◽  
Short Term Storage ◽  
Term Storage

Influence of short-term atmospheric CO2 enrichment on growth, allocation patterns, and biochemistry of black spruce seedlings at different stages of development

1989 ◽  
Vol 19 (6) ◽  
pp. 773-782 ◽  
Author(s):  
Michel A. Campagna ◽  
Hank A. Margolis
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Black Spruce ◽  
Production Cycle ◽  
Nonstructural Carbohydrates ◽  
Short Term ◽  
Stages Of Development ◽  
Greenhouse Production ◽  
Total Nonstructural Carbohydrates

Black spruce seedlings (Piceamariana Mill.) were exposed to either elevated (1000 ppm) or ambient (340 ppm) atmospheric CO2 levels at different stages of seedling development over a winter greenhouse production cycle. Seedlings germinated in early February and were placed in CO2 chambers for either 3 or 6 weeks during March, April, May, or August. Total seedling biomass increased under high CO2 conditions for the March, April, and May stages of development, but showed no significant response in August. The greater part of the CO2 response occurred during the second 3 weeks of exposure in March and April but during the first 3 weeks of exposure in May. In September, those seedlings exposed to CO2 in April and May had 30 and 14%, respectively, greater biomass than control seedlings, but seedlings from the other stages of development no longer had significant differences remaining from the CO2 treatment. This suggests that it could be very efficient to give a short well-timed CO2 pulse at the beginning of the production cycle in hopes of producing a size difference that is maintained throughout the remainder of the greenhouse production cycle under ambient levels of CO2. Short-term exposure to elevated CO2 also increased the ratio of shoot dry weight to total height for the March, April, and May stages of development. The ratio of total nonstructural carbohydrates to free amino acids was negatively correlated (r2 = 0.98) with the allocation of new growth between shoots and roots as measured by the allocation coefficient, k (milligrams shoot growth per milligrams root growth). As seedlings developed along their seasonal growth cycle, ratios of total nonstructural carbohydrates to free amino acids increased and the values for k decreased. The effect of CO2 enrichment on these two factors is discussed. Monitoring total nonstructural carbohydrate and free amino acid concentrations in foliage could have potential as a method to predict the percentage of carbon allocated to root systems of entire forest stands as well as of individual tree seedlings.

scholarly journals Transcriptomic Analysis of Short-Term Salt Stress Response in Watermelon Seedlings

2020 ◽  
Vol 21 (17) ◽  
pp. 6036
Author(s):  
Qiushuo Song ◽  
Madhumita Joshi ◽  
Vijay Joshi
Keyword(s):  
Amino Acids ◽  
Salt Stress ◽  
Amino Acid ◽  
Photosystem Ii ◽  
Free Amino Acids ◽  
Free Amino ◽  
Molecular Mechanisms ◽  
Differentially Expressed ◽  
Short Term ◽  
Salt Stress Response

Watermelon (Citrullus lanatus L.) is a widely popular vegetable fruit crop for human consumption. Soil salinity is among the most critical problems for agricultural production, food security, and sustainability. The transcriptomic and the primary molecular mechanisms that underlie the salt-induced responses in watermelon plants remain uncertain. In this study, the photosynthetic efficiency of photosystem II, free amino acids, and transcriptome profiles of watermelon seedlings exposed to short-term salt stress (300 mM NaCl) were analyzed to identify the genes and pathways associated with response to salt stress. We observed that the maximal photochemical efficiency of photosystem II decreased in salt-stressed plants. Most free amino acids in the leaves of salt-stressed plants increased many folds, while the percent distribution of glutamate and glutamine relative to the amino acid pool decreased. Transcriptome analysis revealed 7622 differentially expressed genes (DEGs) under salt stress, of which 4055 were up-regulated. The GO analysis showed that the molecular function term “transcription factor (TF) activity” was enriched. The assembled transcriptome demonstrated up-regulation of 240 and down-regulation of 194 differentially expressed TFs, of which the members of ERF, WRKY, NAC bHLH, and MYB-related families were over-represented. The functional significance of DEGs associated with endocytosis, amino acid metabolism, nitrogen metabolism, photosynthesis, and hormonal pathways in response to salt stress are discussed. The findings from this study provide novel insights into the salt tolerance mechanism in watermelon.

scholarly journals Effect of a Low Temperature-Induced Quiescence on Short Term Storage of an Egg Parasitoid, Trichogramma sp. Nabis 101

2009 ◽  
Vol 48 (3) ◽  
pp. 369-375 ◽  
Author(s):  
Yong-Gyun Kim ◽  
Hye-Jung Heo ◽  
Geun-Seob Kim ◽  
Eun-Hye Hahm ◽  
Ji-Won Kim ◽  
...  
Keyword(s):  
Low Temperature ◽  
Egg Parasitoid ◽  
Short Term ◽  
Short Term Storage ◽  
Term Storage

Free Amino Acids in Potato Tubers Altered by 2,4-D Treatment of Plants

Science ◽  
1951 ◽  
Vol 114 (2956) ◽  
pp. 204-205
Author(s):  
Merle G. Payne ◽  
Jess L. Fults ◽  
Ruth J. Hay
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Potato Tubers

scholarly journals Influence of Drought and Wounding Stress on Soluble Phenols and Proteins in Potato Tubers

2014 ◽  
Vol 3 (3) ◽  
pp. 1 ◽  
Author(s):  
Christina B. Wegener ◽  
Gisela Jansen ◽  
Hans-Ulrich Jurgens
Keyword(s):  
Amino Acids ◽  
Drought Stress ◽  
Water Supply ◽  
Free Amino Acids ◽  
Free Amino ◽  
Potato Tubers ◽  
Fresh Tissue ◽  
Plant Phenols ◽  
Wounding Stress ◽  
Soluble Phenols

<p>Potato is a valuable source for phytochemicals like vitamins, minerals, plant phenols, amino acids and proteins. However, environmental stress may affect the level of all these components. In this study, two purple breeding clones and one yellow fleshed cultivar (cv.) were assessed in their response to drought and wounding stress in two consecutive years. The plants were grown in the greenhouse under control (sufficient water supply) and with drought stress conditions. After harvest the tubers were analyzed for the content of soluble phenols and proteins in fresh tissue and after wounding. In addition, free amino acids (AAS) and activity of lipid acyl hydrolases (LAH) were assayed in control and drought stressed tubers. The results revealed significant differences in soluble phenols and proteins between genotypes, and that drought stress significantly increased the level of soluble proteins (P &lt; 0.0001) and LAH activity (P &lt; 0.001), but had no significant effect on the concentration of phenols. Moreover, total amounts of free AAS were higher in the drought stress variant. Wounding stress caused a significant increase of soluble phenols in cv. Agave. But, this was less prominent in purple clones which in general had higher contents of phenols. Proteins were also enhanced as a result of wounding, although, the effect of wounding stress on their level was smaller than that of drought stress.<strong></strong></p>

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