The study was conducted to investigate the correlation between vase life and biochemical parameters in sunflower. The experiment was arranged in a randomized complete block design with five replications. Plants were sprayed by 50/100 mg L−1 salicylic acid, 50/100 mg L−1 thiamine, 100/200 mg L−1 ascorbic acid, and distilled water as control group at the eight-leaf stage. After one month, the spray treatments were repeated. The effects of preharvest spray treatment on vase life, protein, lipid peroxidation, peroxidase, polyphenol oxidase, and catalase were investigated. The result showed that thiamine by the most prolonged vase life was the most effective treatment at 50 mg L−1 with 25 days. Its vase life was more than twice the vase life of the control treatment. Also, the application of both concentrations of salicylic acid, ascorbic acid, and thiamine increased the amount of protein content, catalase, and peroxidase activity, and decreased polyphenol oxidase activity and lipid peroxidation among petals and leaves. Besides, while the vase life exhibited a positive correlation with peroxidase, catalase, and protein activity, it showed a negative correlation with polyphenol oxidase and lipid peroxidation.

中文翻译：

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生长阶段喷洒化学物质对观赏向日葵（Helianthus annuus L.）花瓶寿命与生化参数的相关性

该研究旨在调查向日葵花瓶寿命与生化参数之间的相关性。实验采用随机完整区组设计，重复五次。植物在八叶期喷洒50/100 mg L-1水杨酸、50/100 mg L-1硫胺素、100/200 mg L-1抗坏血酸和蒸馏水作为对照组。一个月后，重复喷雾处理。研究了收获前喷雾处理对花瓶寿命、蛋白质、脂质过氧化、过氧化物酶、多酚氧化酶和过氧化氢酶的影响。结果表明，最延长瓶装寿命的硫胺素是 50 mg L-1 的最有效治疗，25 天。它的花瓶寿命是对照处理的花瓶寿命的两倍多。此外，应用两种浓度的水杨酸、抗坏血酸、硫胺素增加蛋白质含量、过氧化氢酶和过氧化物酶活性，降低花瓣和叶片的多酚氧化酶活性和脂质过氧化作用。此外，虽然花瓶寿命与过氧化物酶、过氧化氢酶和蛋白质活性呈正相关，但与多酚氧化酶和脂质过氧化呈负相关。