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以上海种植的小偃54和京411及其杂交后代稳定优选株系6号、7号和10号为材料,通过测定抽穗期剑叶的毫秒延迟发光(ms-DLE)和不同生育期倒数第1片功能叶的光合速率(Pn)、叶绿素含量(Chl)、比叶重(SLW)、Fv/Fm、ATP含量和P700还原初始速率来分析其光合特性的动态变化,为小麦育种选择中改善光合性能提供理论依据和技术途径。结果表明,小麦杂交优选后代6号株系的形态农艺性状近于小偃54,7号株系近于京411,10号株系的变异较大。不同基因型小麦及其杂交优选后代的光合特性与生育时期和衡量指标密切相关,Pn为分蘖期>抽穗期>灌浆期>拔节期,Chl为灌浆期>抽穗期>分蘖期>拔节期,ATP含量为灌浆期>拔节期>分蘖期>抽穗期,P700还原初始速率为灌浆期>抽穗期>拔节期>分蘖期,各生育期间的Fv/Fm无明显差异。小麦光合特性的超亲优势随生育时期而异,杂交优选后代10号株系的Pn和Chl在灌浆期有超亲优势,ATP含量在抽穗期有超亲优势,SLW和P700还原初始速率介于两亲本间。杂交优选后代株系10号聚合了Pn、Chl和ATP含量的超亲优势,其光合特性优于两亲本,而6号劣于两亲本,7号介于两亲本之间。
Xiaoyan 54 and Jing 411 planted in Shanghai and their stable lines 6, 7 and 10 of hybrid progeny were used as materials to determine the ms-DLE and the reciprocal of growth stages The photosynthetic characteristics (Pn), chlorophyll content (Chl), specific leaf weight (SLW), Fv / Fm, ATP content and P700 initial reduction rate of 1 functional leaf were used to analyze the dynamic changes of photosynthetic characteristics and to improve the selection of wheat breeding Photosynthetic properties provide theoretical basis and technical approach. The results showed that the morphological and agronomic traits of hybrid 6, which are the preferred progeny of wheat, were similar to those of strains of Xiaoyan 54,7 near Jing 411 and 10. The photosynthetic characteristics of different genotypes of wheat and their preferred hybrids were closely related to the growth period and the measurement index. Pn was at tillering stage> heading stage> filling stage> jointing stage, and Chl was filling stage> heading stage> tillering stage> jointing stage, The content of F7 / Fm at the grain filling stage> jointing stage> tillering stage> heading stage, P700 reduction rate was the filling stage> heading stage> jointing stage> tillering stage. The heterophilic heterosis of photosynthetic characteristics of wheat varied with the growth period. Pn and Chl of the hybrid progeny No. 10 had super-pro-dominant in grain filling stage, ATP content had super-pro-dominant at heading stage, and the initial reduction rates of SLW and P700 were between Between parents. The hybrid progeny strain No.10 aggregated the super-kindensity of Pn, Chl and ATP content and its photosynthetic characteristics were superior to that of amphipathic, but No. 6 was inferior to that of amphipathic and No. 7 was between two parents.