Is there a difference in the proline accumulation in trees between yound and old leaves?
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Proline accumulation in trees shows a difference between young and old leaves . Young leaves tend to accumulate more proline compared to mature leaves when exposed to exogenous proline application under optimal growth conditions . This differential pattern of proline content between young and old leaves suggests a distinction in proline uptake from the environment and proline production due to salinity stress . Additionally, the study on peach, plum, and apple trees indicates that proline content increases during spring regrowth in both young and old leaves, with variations in the absolute amounts of proline accumulation among different species within the Rosaceae family . Therefore, the age of leaves plays a role in proline accumulation in response to various factors, highlighting the importance of considering leaf age in understanding proline dynamics in trees.
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| Not addressed in the paper. | |
24 Citations | Yes, there is a difference in proline accumulation between young and mature leaves of Arabidopsis thaliana, with young leaves showing higher proline accumulation compared to mature leaves. |
2 Citations | Not addressed in the paper. |
| Proline accumulates similarly in young and old leaves of date palm trees under various abiotic stresses, indicating a common response mechanism regardless of leaf age. | |
52 Citations | Yes, young leaves accumulated more proline under salinity stress compared to old leaves, indicating a difference in proline accumulation between young and old leaves in olive trees. |
Related Questions
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What is the significance of proline and arginine metabolism in plant stress ??5 answersStep 1:
Proline plays a crucial role in plant stress response, acting as an osmolyte, ROS scavenger, and molecular chaperone. It is linked to various cellular processes and can modulate gene expression, aiding in stress acclimation and plant development. Additionally, proline accumulation is associated with tolerance to abiotic stresses, contributing to osmotic adjustment, redox balance, and cellular homeostasis. Similarly, arginine metabolism is also significant in plant stress, with its involvement in nitric oxide production, which regulates various physiological processes and stress responses in plants.
Step 3:
Proline is a multifunctional amino acid that acts as an osmolyte, ROS scavenger, and molecular chaperone, modulating gene expression and aiding in stress acclimation and plant development. Proline accumulation is associated with tolerance to abiotic stresses, contributing to osmotic adjustment, redox balance, and cellular homeostasis. Arginine metabolism is significant in plant stress, with its involvement in nitric oxide production, regulating various physiological processes and stress responses in plants.
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What are the possible mechanisms by which proline protects proteins from aggregation?2 answersProline protects proteins from aggregation through several mechanisms. Firstly, proline binds to folding intermediates and traps them in enzymatically inactive, "aggregation-insensitive" states, preventing aggregation during protein refolding. Secondly, proline destabilizes partially folded states and early aggregates, while solubilizing the native state. Thirdly, proline forms loose, higher-order molecular aggregates at higher concentrations, which are believed to be crucial for its function as a protein folding aid. Additionally, proline can inhibit liquid-liquid phase separation (LLPS) and prevent the formation of solid-like amyloid fibrils, which are associated with diseases like amyotrophic lateral sclerosis (ALS). The formation of an ordered, amphipathic supramolecular assembly by proline is proposed as a mechanism for its chaperone-like behavior. These mechanisms collectively contribute to proline's ability to protect proteins from aggregation.