AI Article Synopsis
- Jatropha curcas L., a plant found in dry areas, was studied to understand how salt stress affects its seed germination and growth.
- Salt stress hampers seed germination and increases sodium and chloride levels in the seeds, leading to decreased reserves of lipids and proteins during the initial growth stages.
- Changes in sugar and amino acid levels were minimal under salt stress, and further analyses revealed significant cellular alterations in seeds exposed to high salinity.
Article Abstract
Jatropha curcas L. is a multipurpose species of the Euphorbiaceae family that is widespread in arid and semiarid regions. This study investigated the ultrastructural and biochemical changes induced by salt stress during J. curcas seed germination and seedling development. Salt stress negatively affected seed germination and increased Na+ and Cl- contents in endosperms and embryo-axis. Lipids represented the most abundant reserves (64% of the quiescent seed dry mass), and their levels were strongly decreased at 8 days after imbibition (DAI) under salinity stress. Proteins were the second most important reserve (21.3%), and their levels were also reduced under salt stress conditions. Starch showed a transient increase at 5 DAI under control conditions, which was correlated with intense lipid mobilisation during this period. Non-reducing sugars and free amino acids were increased in control seeds compared with quiescent seeds, whereas under the salt-stress conditions, minimal changes were observed. In addition, cytochemical and ultrastructural analyses confirmed greater alterations in the cellular reserves of seeds that had been germinated under NaCl stress conditions. Salt stress promoted delays in protein and lipid mobilisation and induced ultrastructural changes in salt-stressed endosperm cells, consistent with delayed protein and oil body degradation.
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| http://dx.doi.org/10.1071/FP15019 | DOI Listing |
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