Confirmed by ion current that systemin still works on tomato cu3 mutant

In order to prevent being eaten by herbivores, plants have evolved a strict defense mechanism. The induction of this defense system is related to jasmonic acid (JA) or its derivative methyl jasmonate. In the nightshade plants, peptide hormones, systemin and hydroxyproline-enriched systemin are used as signal mediators to strictly regulate the JA signal system. Previous reports have shown that the gene controlling the cu3 deletion mutant of tomato (Solanum pimpinellifolium) is the same as the SR160 / tBRI1 gene. The Micro-Electrode Ion Flux Estimation (MIFE) has the characteristics of non-damage and high spatial and temporal resolution. It is used to study the systemic element-induced ion current changes of independent intact plant tissues, confirming the role of systemin and Gene function. In this study, non-damaging micro-measurement technology was used to detect the ion current changes induced by excitons. After systemin acts on the leaf tissue of tomato (Solanum pimpinellifolium), whether it is a wild type or a cu3 deletion mutant, H + influx and K + outflow are enhanced instantaneously, that is, there is no significant difference between the two. This confirms that the tomato cu3 mutant still contains a functional systemin receptor, which, like the wild-type receptor, is not a Cu3 receptor; in addition to SR160 / tBRI1, there is an important systemin receptor presence. This study raises serious questions about the previous assertion that Cu3 protein is also a systemin receptor. Keywords: systemin, non-damage micro-measurement technology (MIFE), receptor (reprinter, please indicate the source) Reference: Frank C. Lanfermeijer, et al. Plant Physiology, 2008, 146: 129- 139

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