Prohydrojasmon (PDJ) can improve the polyphenol and anthocyanin content and antioxidant activity of some crop plants, but it also shows a suppressive effect on the plant growth. This study aimed to investigate the inhibitory effect of PDJ on the growth of two crop plants: komatsuna (Brassica rapa var. periviridis) and eggplant (Solanum melongena). We applied various concentrations of PDJ drip-wise or by spraying to eggplant and komatsuna seedlings and made detailed observations of growth. In general, no significant suppressive effect of PDJ was observed in the aerial parts in both plants. However, a significant inhibitory effect was found in roots treated with PDJ at concentrations of 600 and 1000 ppm. Interestingly, komatsuna treated with PDJ at a concentration of 200 ppm in both approaches resulted in a significant increase in root weight up to 37%. At a concentration range of 200–400 ppm, PDJ showed no inhibitory effects, and in some cases slightly promoted root growth. Therefore, this could be the recommended concentration range. We conclude that application of PDJ can still be beneficial to the vegetable crops without causing serious inhibition or suppression effects on the growth, as long as it is kept at rather low concentrations.

中文翻译：

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茉莉素原对茄子和Komatsuna生长的影响

原茉莉酮（PDJ）可以提高某些农作物的多酚和花色苷含量以及抗氧化活性，但对植物的生长也具有抑制作用。这项研究旨在研究PDJ对两种农作物生长的抑制作用：komatsuna（甘蓝型油菜变种periviridis）和茄子（Solanum melongena））。我们将不同浓度的PDJ滴加或喷洒到茄子和komatsuna幼苗上，并对生长情况进行了详细观察。通常，在两种植物的地上部分均未观察到PDJ的显着抑制作用。但是，在用600和1000 ppm浓度的PDJ处理的根中发现了显着的抑制作用。有趣的是，在两种方法中，以200 ppm的浓度用PDJ处理的komatsuna导致根重显着增加，最高可达37％。在200–400 ppm的浓度范围内，PDJ没有抑制作用，在某些情况下会略微促进根部生长。因此，这可能是推荐的浓度范围。我们得出的结论是，PDJ的使用仍然对蔬菜作物有益，而不会引起严重的抑制或抑制生长的作用，