PJB-2024-135
MICROCAPSULE SUSTAINED-RELEASE TECHNIQUE CAN PROLONG THE EFFECT OF JASMONATES ON NEEDLES OF LARIX KAEMPFERI (LAMB.) CARRIERE
JIAN LIN
Abstract
The controlled release of pesticide microcapsules is an innovative approach that extends the duration of effectiveness, minimizes the loss of the active substance, and lessens the environmental footprint, thus supporting sustainable practices. Jasmonic acid (JA) and its methyl ester derivative, Methyl jasmonate (MJA), are recognized inducers of plant resistance. They have been observed to markedly elevate the levels of critical defensive proteins in Larix kaempferi seedlings upon application. However, the high volatility and fleeting efficacy of these compounds pose challenges. This research utilized chitosan and Tween 20 to engineer sustained-release microcapsule suspensions containing JA and MJA, aiming to compare the inducement effects pre- and post-gradual release. The findings reveal that both treatments significantly bolstered the defense protease concentrations in the needles. While the JA and MJA slow-release treatment induction rate was slower within the initial 1-3 days, the later stages saw induction levels that surpassed those of direct spraying to some extent. Moreover, it extended the effective period of JA and MJA by 5-10 days. Specifically, the JA sustained-release treatment increased the effective induction period for PAL, PPO, CAT, and POD by 5 days, whereas the MJA treatment did the same for CAT, POD, and PAL but did not extend PPO's efficacy duration. These outcomes demonstrate that the JA and MJA sustained-release microcapsule suspensions can enhance the induction effects of these compounds, offering theoretical insights for the practical application of JA and MJA induced resistance techniques in forestry.
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