Exogenous arachidonic acid and methyl jasmonate induced-changes on the free fatty acid profile of rice (Oryza sativa L.) grown on saline soil
2019
Cha, Thye San | Puteri Afiqah Abdul Wahab | Muhamad Fairus Noor Hassim | Azrul Hanis Zainuddin | Ma, Nyuk Ling | Aziz Ahmad
Rice growth and productivity are restricted by the uncontrollable abiotic factors such as salinity and drought at various developmental stages. Plants respond to abiotic stress by modifying fatty acid profile and turnover to sequester carbon energies and phospholipid. Therefore, acyl lipid metabolism is crucial throughout the plant life cycle and in response to abiotic or biotic stresses. Nonetheless, a very limited report on the effects of exogenous fatty acids on lipid profile in rice grown under salinity conditions. Therefore, the objective of the study was to determine the effects of foliar application of arachidonic acid (AA) and methyl jasmonate (MeJA) on the fatty acid profile of rice planted on saline soil. AA and MeJA were separately applied on foliar at with or without 50 µM two weeks prior to panicle initiation. The leaves and panicle were analysed for free fatty acid profile using gas chromatography massspectrophotometry. Results showed that the levels for at least 25 fatty acids were altered by the exogenous fatty acid treatments in both leaves and panicle. Alpha-linolenic acid was significantly increased in panicle by both AA and MeJA treatments. This finding suggested that α-linolenic acid may play a major role in regulating the panicle development during the salinity stress. In addition, the AA and MeJA treatments reduced the formation of cytosolic free fatty acids in both leaves and panicle of rice plants under saline stress.
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