Abstract
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.
Highlights
Jasmonates are among the most important plant hormones which play roles in many aspects of plant growth
We reported that application of PDJ to vegetable crops significantly increased the phenolic compounds, anthocyanin content, and antioxidant activity in komatsuna and lettuce [13]
In the aerial part, we found a wilting leaves phenomenon occurred in komatsuna after they sprayed with PDJ at a high concentration (1000 ppm)
Summary
Jasmonates are among the most important plant hormones which play roles in many aspects of plant growth. Since the first isolation of its methyl ester (jasmonic acid methyl ester), numerous jasmonates have been detected in various plant phyla. Prohydrojasmon (PDJ) is a synthetic analog of jasmonic acid (JA) developed as a plant growth regulator. Plant growth regulators are defined as naturally or chemically synthesized substances that play roles in developmental or metabolic processes in plants [4]. It has been shown to affect several physiological processes, including senescence, leaf abscission, fruit ripening, coloration, and pigment accumulation [5,6]. Other studies have shown that PDJ functions as an elicitor in plants to stimulate the accumulation of secondary metabolites including phenolics, anthocyanins, terpenoids, and glucosinolates [7,8]
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