Naing Aung Htay, Soe May Thu, Yeum Jeong Hyun, Kim Chang Kil
Department of Horticulture, Kyungpook National University, Daegu, South Korea.
School of Biofibers and Biomaterials Science, Kyungpook National University, Daegu, South Korea.
Front Plant Sci. 2021 Sep 30;12:745038. doi: 10.3389/fpls.2021.745038. eCollection 2021.
This study investigated whether ethylene is involved in the stem-bending mechanism of three different snapdragon cultivars 'Asrit Red', 'Asrit Yellow', and 'Merryred Pink', by treating their cut stems with an ethylene-releasing compound (ethephon), an ethylene-action inhibitor [silver thiosulfate (STS)], and distilled water (as the control). Ethephon completely prevented stem bending in all cultivars, whereas STS exhibited a higher bending rate compared with the control. The bending rates were influenced by several factors, such as the degree of stem curvature, relative shoot elongation, ethylene production, and lignin content, indicating their involvement in the stem-bending mechanism of the cultivars. The analysis of the expression of genes involved in the ethylene and lignin biosynthetic pathways also supported the importance of lignin and ethylene in the stem-bending mechanism. Taken together, as ethephon completely prevented stem bending of the three snapdragon cultivars, this study suggested that ethylene acts as a negative regulator of the stem-bending mechanism of snapdragon cultivars, and the information will be valuable for the prevention of stem bending in other commercially important ornamental flowers.
本研究通过用乙烯释放化合物（乙烯利）、乙烯作用抑制剂[硫代硫酸银（STS）]和蒸馏水（作为对照）处理三种不同的金鱼草品种‘Asrit Red’、‘Asrit Yellow’和‘Merryred Pink’的切茎，来探究乙烯是否参与其茎弯曲机制。乙烯利完全抑制了所有品种的茎弯曲，而与对照相比，STS表现出更高的弯曲率。弯曲率受几个因素影响，如茎弯曲程度、相对枝条伸长、乙烯产生和木质素含量，表明它们参与了这些品种的茎弯曲机制。对乙烯和木质素生物合成途径相关基因表达的分析也支持了木质素和乙烯在茎弯曲机制中的重要性。综上所述，由于乙烯利完全抑制了这三个金鱼草品种的茎弯曲，本研究表明乙烯作为金鱼草品种茎弯曲机制的负调节因子，该信息对于预防其他具有重要商业价值的观赏花卉的茎弯曲将具有重要意义。
