半干旱地区菊芋品系植株表型与光合特性分析

为了加快半干旱地区的新型资源作物菊芋品种的选育进程，探讨菊芋产量及相关性状表型和光合生理基础是必要的。选用本课题组收集和培育的4个品系( 2个高产，2个低产品系)，设置随机区组试验，比较菊芋高产和低产品系与产量形成相关的生物量累积、植株表型和光合特性的差异。结果表明，高产菊芋品系的地上生物量、块茎产量及根生物量显著高于低产品系；高产品系整体表现出明显的生长优势，其株高、基径、叶面积和叶片数均显著高于低产品系。气体交换参数分析表明，高产品系的光补偿点和暗呼吸速率显著小于低产品系，而其他各项参数差异不显著。相关性分析表明，菊芋块茎产量与株高、基径、叶面积、叶片数、地上生物量和根生物量呈显著正相关，而与光补偿点和暗呼吸速率呈显著负相关。建议多的叶片数、大的叶面积和发达的根系作为半干旱地区菊芋高产品系田间选育指标，而低的光补偿点和暗呼吸速率在高产品系选育中也具参考价值。

Analysis of Phenotypic Traits and Photosynthetic Characteristics of Jerusalem Artichoke (Helianthus tuberosus L.) in the Semi-Arid Area

To speed up breeding process for Jerusalem artichoke in semi-arid area, it is necessary to investigate traits related to yield and photosynthetic characteristics. Four stable lines including two high-yield lines and two low-yield lines were screened as materials, agronomic traits and photosynthesis parameters were determined. The results showed that the tuber yield, shoot biomass and root biomass of Jerusalem artichoke high-yield lines were significantly higher than those of low-yield lines, and the plant height, stem diameter, leaf area, leaf number of high-yield lines were also significantly higher than those of low-yield lines, then compared with low-yield lines, the high-yield lines showed a stronger growth vigor. LCP and R_d of high-yield lines were significantly lower than those of low-yield lines, but the difference of other parameters were not significant. Correlation analysis indicated that tuber yield had significantly positive correlation with plant height, stem diameter, leaf area, leaf number, shoot biomass and root biomass, while significantly negative correlation with LCP and R_d. Hence, in semi-arid area more leaf number, larger leaf area and well-developed root system are very important and reliable indicators and lower LCP and R_d are important reference value for breeding high-yield lines in Jerusalem artichoke.