论文部分内容阅读
【目的】研究灰枣3个优系(‘灰实2’、‘灰实7’和‘灰实8’)果实膨大期的光合及叶绿素荧光特性。【方法】以灰枣的3个优系为研究对象,灰枣为CK,采用单因素完全随机区组设计,测定灰枣及其3个优系叶片的光合-光响应生理参数及叶绿素荧光日变化。【结果】‘灰实2’和‘灰实7’的LCP较低而LSP较高、Rd值较高;‘灰实8’的LCP较高而LSP较低、Rd值较低;‘灰实2’的Pmax和AQE均最大,其Rubisco活性和电子传递速率较高。灰枣及其3个优系在强光和高温胁迫下,都会出现光抑制现象;‘灰实2’和‘灰实7’受到光抑制后恢复快且耐受性良好,二者的表观光合电子传递速率优于‘灰实8’;‘灰实7’的光化学反应启动速率和光能利用率最高,‘灰实2’次之,‘灰实8’最低;‘灰实8’受到高温强光胁迫后的生理调节机制和自我保护机制启动较慢。【结论】‘灰实2’对弱光的利用能力最强,对强光的适应性最好,具备丰产潜力;‘灰实7’的光合能力略次于‘灰实2’,优于CK和‘灰实8’。‘灰实2’叶片中PSII天线色素内的最初原子密度及叶绿素含量高于CK和其他优系,具有很好的光能利用潜力;‘灰实2’和‘灰实7’对强光及高温胁迫的反应较‘灰实8’和CK要灵敏;‘灰实8’对弱光的利用能力较弱且对强光适应性差。
【Objective】 The objective of this study was to study the photosynthetic and chlorophyll fluorescence characteristics of three elite lines (’Ash 2’, ’Ash 7’ and ’Ash 8’) during the blooming period. 【Method】 Three excellent lines of jujube were used as research object, gray jujube was CK. The single factor randomized complete block design was used to determine the photosynthetic-photophysical parameters and chlorophyll fluorescence date of jujube and its three best lines. Variety. 【Result】 The results showed that the LCPs of ’Ash 2’ and ’Ash 7’ were lower and the values of LSP were higher and the values of Rd were higher. The LCPs of ’Ash 8’ were higher while the values of LSP were lower and Rd values were lower. 2 ’had the highest Pmax and AQE, and higher Rubisco activity and electron transfer rate. Jujube and its three excellent lines under light and high temperature stress, there will be light suppression phenomenon; ’Ash 2’ and ’Ash 7’ by the inhibition of light quickly restored and well tolerated, the two of the apparent light The electron transfer rate was better than that of ’Ash 8’, ’Ash’ 7 ’had the highest rate of photochemical reaction initiation and utilization of light energy,’ Ash 2 ’,’ Ash 8 ’the lowest,’ Ash 8 ’ The physiological regulation mechanism and self-protection mechanism after glare stress started slowly. 【Conclusion】 ’Ash 2’ had the highest utilization of low light, the best adaptability to light, and had the potential of high yield. The photosynthetic capacity of ’Ash 7’ was slightly lower than that of ’Ash 2’ And ’ash 8’. The initial atomic density and chlorophyll content of PSII antenna pigment in ’Ash 2’ leaves were higher than those of CK and other excellent lines, and had good utilization potential of light energy. ’Ash 2’ and ’Ash 7’ The response to high temperature stress was more sensitive than that of ’Ash 8’ and CK, ’Ash 8’ had weaker light utilization ability and poor adaptability to light.