安徽省江淮丘陵地区3个长山核桃品种的光合特性
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十三五国家科技支撑子课题项目(2015BAD07B050303)资助。


Comparison of the photosynthetic physiological characteristics of three pecan cultivars in Jianghuai hilly region, Anhui Province
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    摘要:

    为探讨安徽省江淮丘陵地区长山核桃结果期的光合特性及差异性,利用Li-6400便携式光合作用测定仪对波尼(Pawnee)、马汉(Mahan)和威奇塔(Wichita)3个主栽品种的光合指标进行了测定。结果表明:3个品种的PnGsTr日变化曲线均呈不对称双峰型,Ci日变化曲线呈不规则倒“W”型;Pn日变化平均值大小依次为威奇塔>马汉>波尼,说明威奇塔的光合利用能力要强于马汉和波尼;WUE日变化平均值由大到小顺序依次为威奇塔、波尼及马汉,说明马汉抗旱能力要弱于其他品种;威奇塔的最大净光合速率(Amax)和光饱和点(LSP)分别为14.708和1 973.75 μmol·m-2·s-1,显著高于其他品种(P < 0.05),光补偿点(LCP)则显著低于其他品种(P < 0.05),表明威奇塔对光的利用范围广,且对弱光环境的适应性强,栽培范围广;3个品种的表观量子效率(AQY)和暗呼吸速率(Rd)无显著差异性(P>0.05);相关分析和通径分析表明,光合有效辐射(PAR)和大气CO2浓度是影响3个长山核桃品种Pn日变化的主要因素。研究结果将帮助确定冠层光截存的最优水平,为长山核桃结果期发展冠层管理实践提供依据。

    Abstract:

    In order to explore the photosynthetic characteristics in fruiting period of pecan, we measured the photosynthetic indices of 10-year-old grafted pecan plants of three pecan main cultivars (Pawnee, Mahan and Wichita) grown in Jianghuai hilly region of Anhui Province using Li-6400 portable photosynthesis systems. The results were as follows. The morphological trait of net photosynthetic rate (Pn), stomatal conductance (GS) and transpiration rate (Tr) of three cultivars showed a strong asymmetric and bimodal distribution, while intercellular CO2 concentration (Ci) showed an irregular inverted "W" pattern with two peaks at 10:00 and 16:00. The order of three diurnal average values of WUE in pecan from the highest to the lowest was Wichita, Pawnee and Mandan, showing that the drought resistance of Mahan was weaker than that of other cultivars. Wichita had the maximum net photosynthetic rate (Amax) and light saturation point (LSP) with 14.708 and 1 973.75 μmol·m-2·s-1, separately, which were significantly higher than those of the other two cultivars (P < 0.05). However, the light compensation point ( LCP) of Wichita was significantly lower than other two cultivars (P < 0.05), which indicated that Wichita had the highest light use efficiency and photosynthetic rate under the low light environment. There was not significant difference in both apparent quantum yield (AQY) and dark respiration rate among three cultivars (P > 0.05). The correlation analysis and path analysis showed that photosynthetically available radiation (PAR) and the CO2

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  • 在线发布日期: 2021-01-22