Gao Shulin, Wang Chenxu, Yang Xu, Ji Tianyu, Shang Suqi, Li Shuo, Wen Yinyuan, Ren Jianhong, Li Xiaorui, Zhao Juan, Hu Chunyan, Yuan Xiangyang, Dong Shuqi
College of Agriculture, Shanxi Agricultural University, Taigu 030800, China.
College of Life Sciences, Shanxi Agricultural University, Taigu 030800, China.
Plants (Basel). 2025 Aug 12;14(16):2502. doi: 10.3390/plants14162502.
As a strategic crop of dry farming in northern China, the photosynthetic characteristics and stress resistance of foxtail millet ( L.) are crucial to yield formation. This study aimed to explore the physiological characteristics of various foxtail millet varieties and screen high-efficiency varieties adapted to semi-arid climates. In the agro-pastoral ecotone of northern Shanxi Province, the physiological and ecological parameters, etc. of six cultivars were measured. The results showed that different cultivars had bimodal diurnal photosynthetic curves with distinct peak values and midday depression degrees, reflecting varied responses to high midday temperature and light stress. Dabaigu and Jingu 21 performed superiorly, with mean daily net photosynthetic rates (Pn) of 22.99 and 20.72 µmol·m·s, significantly higher than Jinmiao K1 (12.87 µmol·m·s). Chlorophyll fluorescence analysis showed Dabaigu had higher potential activity (/) of 3.98 than Jinmiao K1 (2.40). Jingu 21 synergistically optimized plant height, stem diameter, and biomass accumulation. Dabaigu and Jingu 21 are elite cultivars for the agro-pastoral ecotone of northern Shanxi Province due to high photosynthetic efficiency, strong photoprotection, and morphological plasticity.
作为中国北方旱作农业的战略作物，谷子的光合特性和抗逆性对产量形成至关重要。本研究旨在探究不同谷子品种的生理特性，筛选适应半干旱气候的高效品种。在晋北农牧交错区，测定了6个品种的生理生态参数等。结果表明，不同品种的光合日变化曲线呈双峰型，峰值和午间降低程度各异，反映出对午间高温和光照胁迫的不同响应。大白谷和晋谷21表现优异，日均净光合速率（Pn）分别为22.99和20.72 μmol·m·s，显著高于晋谷K1（12.87 μmol·m·s）。叶绿素荧光分析显示，大白谷的潜在活性（Fv/Fm）为3.98，高于晋谷K1（2.40）。晋谷21协同优化了株高、茎粗和生物量积累。大白谷和晋谷21光合效率高、光保护能力强且形态可塑性大，是晋北农牧交错区的优良品种。
