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    5-氨基乙酰丙酸(ALA)提高兩種園林植物葉片耐熱性效應 Effect of 5-Aminolevulinic Acid on Leaf Heat Tolerance in Ligustrum jap

      摘要:   本試驗以金森女貞和金山繡線菊為材料,利用M-PEA多功能植物效率儀檢測了葉面噴施50 mg/L 5-氨基乙酰丙酸(ALA) 25 d后離體葉片對高溫逆境的適應性,發現ALA處理葉片在50℃高溫處理不同時間后仍能保持一定光化學效率,降低PSII反應中心供體側放氧復合體受抑程度,維持PSII反應中心較高的開放程度以及用于光合電子傳遞的量子產額和有活性的反應中心密度,提高了PSI反應中心最大光化學效率,從而保證了較高的光合性能指數。PSI反應中心電子氧化速率(VPSI)對高溫脅迫不敏感,而PSII與PSI之間的電子傳遞速率(VPSII-PSI)對高溫脅迫相當敏感,ALA對高溫下兩種園林植物葉片VPSII-PSI有較高的保護效應。以上結果說明,ALA可以提高園林植物耐高溫能力。這為其在炎熱夏季園林生產中應用提供了理論依據。本研究還表明,金山繡線菊的耐熱性高于金森女貞,ALA對金森女貞耐熱性的促進效應在短時間高溫脅迫下便可體現出來,而對金山繡線菊耐熱性的促進效應需要較長時間才能體現出來。 The detached leaf chlorophyll fluorescence responses of Ligustrum japonicum and Spiraea japonica which were pretreated with 5-aminolevulinic acid (ALA) solution at a dosage of 50 mg?L?1 for 25 d and treated at 50?C temperature for 30~90 min, were measured by a multifunctional plant efficiency analyzer (M-PEA). The results show that the leaves which were pretreated by ALA maintained higher levels of the maximal photochemical efficiency (Fv/Fm), but less inhibition of oxygen evolving complex activity at the donor side of PSII reaction centers (Vk) and the maximal close rate at the acceptor side of PSII reaction center (Mo). ALA treatment significantly increased the quantum yield in photosynthetic electron transfer (φEo), the active reaction center density (RC/CS), the efficiency to reduce the terminal electron acceptors of PSI reaction center (φRo), and therefore the capacity index based on the absorption (PIabs). Conversely, high temperature stress impaired the reduction rate of PSI reaction center by the electrons transferred from PSII reaction center (VPSII-PSI) more than the oxidation rate of PSI reaction center by the terminal electron acceptors (VPSI). This means that the electron transfer of intersystem was more sensitive to short-term rapid heat stress than PSI itself. The results in the study show that the leaves of S. japonica were more heat tolerance than those of L. japonicum, and the improving effects by ALA were effective at the early stage of heat stress on L. japonicum while at the later stage on S. japonica. Therefore, this new regulator may be applied in garden plant production to protect heat stress in high temperature summer.   展開

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