论文部分内容阅读
本文以盆栽‘威代尔’葡萄为试验材料,通过测定叶绿素荧光快速诱导动力学曲线、叶绿素荧光淬灭并结合气体交换,分析了高温胁迫下根施褪黑素(melatonin,MT)对葡萄叶片叶绿素荧光特性的影响。结果表明,高温胁迫下,与对照(CK)相比,葡萄叶片净光合速率(P_n)及叶片最大光化学效率(F_v/F_m)均显著下降,OJIP曲线形状发生明显改变,非光化学淬灭(NPQ)显著升高;而根施褪黑素显著缓解了叶片P_n和Fv/F_m的下降,明显降低了高温胁迫下OJIP曲线中K点和J点上升的幅度,增加了叶片对光能的利用效率。上述结果表明,高温胁迫导致葡萄叶片光系统II(PSII)发生较严重的伤害,根施褪黑素能够缓解PSII活性和光合速率的下降程度,改善高温胁迫下葡萄叶片的能量分配。
In this study, the potted Vydrville grapes were used as test materials to measure the chlorophyll fluorescence rapid induction kinetic curve, chlorophyll fluorescence quenching and gas exchange. The effect of melatonin (MT) Effect of Chlorophyll Fluorescence Properties. The results showed that under high temperature stress, the net photosynthetic rate (P_n) and the maximum photochemical efficiency (F_v / F_m) of grape leaves decreased significantly compared with CK, the shape of OJIP curve changed obviously, NPQ ), While melatonin treatment significantly reduced the decline of P_n and Fv / Fm, significantly decreased the increase of K and J in OJIP curve under high temperature stress, and increased the utilization efficiency of light energy . The above results showed that high temperature stress caused serious damage to PSII of grape leaves. Melatonin could alleviate the decrease of PSII activity and photosynthetic rate, and improve the energy allocation of grape leaves under high temperature stress.