| 摘要: |
| 【目的】对2种根砧嫁接的‘洛阳红’盆栽植株叶片的光合特性与叶绿素荧光参数季节性变化进行比较，筛选更适宜盆栽的嫁接‘洛阳红’砧木。【方法】以‘洛阳红’为接穗，芍药根和凤丹根为砧木，测定2种根砧嫁接‘洛阳红’叶片的净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、单叶瞬时水分利用效率（WUE）、羧化速率（CE）等光合特性以及初始荧光(F0)、最大荧光(Fm)、PSⅡ的最大光化学效率(Fv/Fm)、PSⅡ的有效量子产量［Y(Ⅱ)］、光化学淬灭系数(qP)、非光化学淬灭系数(qN)等叶绿素荧光参数，并分析Pn与其他参数的相关性。【结果】 盛花期至夏季休眠期，芍药砧‘洛阳红’叶片的Pn始终高于凤丹砧‘洛阳红’。圆桃期至盛花期，芍药砧‘洛阳红’叶片的Pn、CE、WUE、Fm、Fv/Fm、Y(Ⅱ)分别增长了145.86%，245.10%，60.68%，33.27%，8.45%和25.00%，增长幅度较凤丹砧‘洛阳红’大。花后生长期，芍药砧‘洛阳红’叶片qN显著高于凤丹砧‘洛阳红’。相关性分析表明，芍药砧和凤丹砧‘洛阳红’叶片的Pn与CE、Tr均呈极显著正相关，芍药砧‘洛阳红’的Pn与Gs呈显著正相关，凤丹砧‘洛阳红’的Pn与Gs呈极显著正相关；芍药砧‘洛阳红’Pn与Fv/Fm呈极显著正相关，凤丹砧‘洛阳红’Pn与Fv/Fm呈显著正相关，2种根砧‘洛阳红’Pn与Y(Ⅱ)均呈正相关关系，但均未达到显著水平。【结论】芍药砧嫁接‘洛阳红’叶片具有更高的光能利用效率，更适宜作为盆栽‘洛阳红’的砧木。 |
| 关键词: 根砧嫁接 ‘洛阳红’牡丹 光合参数 叶绿素荧光参数 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目“牡丹、芍药远缘杂交不亲和性研究”（31600568）；河南农业大学博士基金项目“牡丹韧皮部蔗糖转运机理研究”（30500565） |
|
| Comparison of photosynthetic characteristics and fluorescence parameters of grafted ‘Luoyang Hong’ on two rootstocks |
|
CHANG Yihong,ZHAO Pengfei,WANG Rui,et al
|
| Abstract: |
| 【Objective】Seasonal changes of photosynthetic characteristics and chlorophyll fluorescence parameters in leaves of potted ‘Luoyang Hong’ grafted with two rootstocks were compared to select suitable potted rootstocks for grafted ‘Luoyang Hong’.【Method】With the branches of Paeonia suffruticosa ‘Luoyang Hong’ as scion,roots of Paeonia broteri and Paeonia ostii were used as rootstocks to determine the photosynthetic characteristics including net photosynthetic rate (Pn),stomatal conductance (Gs),intercellular CO2 concentration (Ci),transpiration rate (Tr),and single leaf instantaneous water use efficiency (WUE) as well as chlorophyll fluorescence parameters including initial fluorescence (F0),maximum fluorescence (Fm),maximum photochemical efficiency of PSⅡ (Fv/Fm),effective quantum yield of PSⅡ ［Y(Ⅱ)］,photochemical quenching coefficient (qP),and non photochemical quenching coefficient (qN).The correlation of Pn with other parameters was also analyzed.【Result】From the full flowering stage to the summer dormancy stage,the Pn of ‘Luoyang Hong’ grafted on Paeonia broteri root was higher than that on Paeonia ostii root.From the round peach stage to the full flowering stage,Pn,CE,WUE,Fm,Fv/Fm,and Y(Ⅱ) of ‘Luoyang Hong’ grafted on Paeonia broteri root were increased by 145.86%,245.10%,60.68%,33.27%,8.45% and 25.00%,all were larger than that of Paeonia ostii.In the post anthesis growth stage,qN of ‘Luoyang Hong’ grafted on Paeonia broteri root was significantly higher than that on Paeonia ostii.The correlation analysis showed that Pn of tree peony grafted on Paeonia broteri and Paeonia ostii was significantly and positively correlated with CE and Tr.Pn of tree peony grafted on Paeonia broteri was significantly positively correlated with Gs and Pn of tree peony grafted on Paeonia ostii was positively correlated with that of Gs.There was a significantly positive correlation between Pn and Fv/Fmof ‘Luoyang Hong’ grafted on Paeonia broteri,and Pn of tree peony grafted on Paeonia ostii was positively correlated with Fv/Fm.Pn of the two grafted ‘Luoyang Hong’ was positively related to Y(Ⅱ) insignificantly.【Conclusion】The leaves of ‘Luoyang Hong’ grafted on Paeonia broteri root had higher light energy utilization efficiency and Paeonia broteri roots are more suitable as rootstock for potted ‘Luoyang Hong’. |
| Key words: graft ‘Luoyang Hong’ tree peony photosynthetic characteristics chlorophyll fluorescence parameters |
