Liu Han, Wang Qiang, Cheng Ting, Wan Yan, Wei Wei, Ye Xueling, Liu Changying, Sun Wenjun, Fan Yu, Zou Liang, Guo Laichun, Xiang Dabing
Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China.
Sichuan Engineering & Technology Research Center of Coarse Cereal Industrialization, Chengdu University, Chengdu 610106, China.
Plants (Basel). 2024 Nov 28;13(23):3336. doi: 10.3390/plants13233336.
Tartary buckwheat is characterized by its numerous inflorescences; however, the uneven distribution of resources can lead to an overload in certain areas, significantly limiting plant productivity. Plant growth regulators effectively modulate plant growth and development. This study investigated the effects of three concentrations of brassinosteroids (EBR) on the Tartary buckwheat cultivar with high seed-setting rates, specifically Chuanqiao No. 1 (CQ1), and low seed-setting rates, namely Xiqiao No. 1 (XQ1), through field experiments. The goal was to investigate how EBR regulates buckwheat grain-filling, enhancing the seed-setting rates, and to understand the physiological mechanisms behind this improvement. The results indicated that EBR treatment followed the typical "S" type growth curve of crops, resulting in an increase in the Tartary buckwheat grain-filling rate. Varieties with high seed-setting rates demonstrated a greater capacity for grain-filling. EBR was observed to regulate hormone content, enhance the photosynthetic capacity of Tartary buckwheat, and increase yield. This was accomplished by enhancing the accumulation of photosynthetic products during the grain-filling period. Specifically, EBR elevated the activity of several key enzymes, including pre-leaf sucrose phosphate synthase (SPS), seed sucrose synthase (SS), late grain-filling acid invertase (AI), grain-filling leaf SPS, and grain SS. These changes led to an increased accumulation of sucrose and starch from photosynthetic products. In summary, the G2 concentration of EBR (0.1 mg/L) demonstrated the most significant impact on the seed-setting rates and yield enhancement of Tartary buckwheat.
苦荞以其众多的花序为特征；然而，资源分布不均会导致某些区域负荷过重，显著限制植物生产力。植物生长调节剂能有效调节植物的生长发育。本研究通过田间试验，研究了三种浓度的油菜素内酯（EBR）对高结实率苦荞品种川荞1号（CQ1）和低结实率品种西荞1号（XQ1）的影响。目的是研究EBR如何调节苦荞籽粒灌浆，提高结实率，并了解这种改善背后的生理机制。结果表明，EBR处理遵循作物典型的“S”型生长曲线，导致苦荞籽粒灌浆速率增加。高结实率品种表现出更大的籽粒灌浆能力。观察到EBR能调节激素含量，增强苦荞的光合能力，并提高产量。这是通过在籽粒灌浆期增强光合产物的积累来实现的。具体而言，EBR提高了几种关键酶的活性，包括叶片前期蔗糖磷酸合酶（SPS）、种子蔗糖合酶（SS）、灌浆后期酸性转化酶（AI）、灌浆叶片SPS和籽粒SS。这些变化导致光合产物中蔗糖和淀粉的积累增加。总之，EBR的G2浓度（0.1 mg/L）对苦荞的结实率和产量提高影响最为显著。
