Miyazaki Sho, Kasahara Keita, Matsui Soh, Tokuda Makoto, Saikawa Yoko
Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan.
Plants (Basel). 2020 Sep 26;9(10):1270. doi: 10.3390/plants9101270.
Orange leafhopper feeding induces wallaby ear symptoms, namely growth suppression and gall formation characterized by severe swelling of leaf veins, on various Poaceae, thereby leading to low crop yields. Here, we investigated the development of wallaby ear symptoms on rice seedlings due to feeding. After confirming that feeding induces growth suppression and gall formation on rice seedlings, we further demonstrated that gall formation score decreased with decreasing levels of nitrogen in the medium and that feeding induces the expression levels of nitrogen transporter genes. These gene expression changes may participate in the nutrient accumulation observed in galled tissues and in gall formation. In addition, these expression changes should induce growth promotion but the inhibition of gibberellin signaling by feeding might be the reason why growth is suppressed. Treatment with plant growth regulators did not affect gall formation, suggesting the existence of a complex gall formation mechanism by feeding.
橙叶蝉取食会在多种禾本科植物上引发袋鼠耳症状，即生长受抑制和形成虫瘿，其特征为叶脉严重肿胀，从而导致作物产量降低。在此，我们研究了因取食导致水稻幼苗出现袋鼠耳症状的发展情况。在确认取食会导致水稻幼苗生长受抑制和形成虫瘿后，我们进一步证明，随着培养基中氮水平的降低，虫瘿形成评分降低，且取食会诱导氮转运蛋白基因的表达水平。这些基因表达变化可能参与了在虫瘿组织中观察到的养分积累以及虫瘿形成过程。此外，这些表达变化本应促进生长，但取食对赤霉素信号传导的抑制可能是生长受抑制的原因。用植物生长调节剂处理并未影响虫瘿形成，这表明存在由取食导致的复杂虫瘿形成机制。
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