肉桂醛為肉桂科植物分泌的一種揮發性次級代謝物，具抗菌活性可以提升植物對生物性逆境之抗性，但對非生物逆境之抗性則鮮少被研究。為了瞭解氣態肉桂醛對植物在非生物逆境耐受性及反應機制，本研究以肉桂醛氣態分子與水稻及綠豆進行處理，結果發現經過肉桂醛氣味處理可顯著降低水稻及綠豆根部細胞因鹽逆境、銅逆境與氧化逆境造成的細胞死亡。針對水稻與鹽逆境進一步研究發現，在鹽逆境下，經肉桂醛氣味處理後的水稻根部的活性氧(ROS)累積顯著減少，氧化酶(POD)之同功酶POD-b之活性也降低，但以癒創木酚法檢測POD整體活性則是略微降低。肉桂醛對超氧化物歧化酶(SOD)與過氧化氫酶(CAT)之活性則無明顯影響。再者，經肉桂醛處理後的水稻根部在鹽逆境下，輔胺酸(proline)含量顯著上升，但proline在銅逆境下雖有上升卻未達顯著。進一步檢測發現，經肉桂醛氣體薰染後再放入鹽逆境中，部分proline代謝相關基因表現量顯著高於對照組。綜合這些結果，水稻幼苗經肉桂醛處理後可能透過積累高濃度proline以抵抗鹽逆境所帶來的氧化壓力及其造成的損傷。最後，本研究也檢測丁香酚(亦為植物揮發性次級代謝物)對水稻逆境耐受性之影響，發現丁香酚會減緩水稻根部在氧化逆境中的細胞死亡，但無法減緩鹽逆境所造成的細胞死亡現象。

According to a publication by the Food and Agriculture Organization of the UnitedNations (FAO) and the Intergovernmental Technical Panel on Soils (ITPS) in 2015, it was estimated that at least 20% of the total arable land would be affected by salinization. Soil salinity is a major environmental stress that restrict the growth and yield of plants. Among the cereals, rice is the most sensitive to salinity stress. Cinnamaldehyde (CA) is a volatile secondary metabolite with antibacterial activity that can enhance plant resistance to biotic stress. To understand the effect of gaseous cinnamaldehyde on the tolerance and response mechanisms of plants to abiotic stress, CA will be co-culture with rice or mung bean as a pretreat under stress condition. Results show that CA significantly reduced cell death in the roots of rice caused by salt or copper stress. CA dramatically decreased ROS accumulation caused by salt-stress in the root tip of rice seedlings. The content of L-proline content significantly increased under salt condition in the rice roots with CA pretreated. It suggests that the CA might ameliorate salt-induced oxidative damage mainly modulating ROS scavenged, by the nonenzymatic antioxidant generation under salt stress. Take these result together, CA might enhance rice salt stress tolerance by increase mRNA expression involved in proline biosynthesis, and increase L-proline concentration in rice root

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