Sustainable Agricultural Systems Laboratory, United States Department of Agriculture, Agricultural Research Service, Henry A. Wallace Beltsville Agricultural Research Center, Beltsville, MD 20705-2350, USA.
Department of Plant & Environmental Sciences, Weizmann Institute of Science, Rehovot 76100, Israel.
Int J Mol Sci. 2020 Dec 15;21(24):9527. doi: 10.3390/ijms21249527.
Lipoxygenases (LOXs) (EC 1.13.11.12) catalyze the oxygenation of fatty acids and produce oxylipins, including the plant hormone jasmonic acid (JA) and its methyl ester, methyl jasmonate (MeJA). Little information is available about the LOX gene family in aquatic plants. We identified a novel LOX gene family comprising nine LOX genes in the aquatic plant (greater duckweed). The reduced anatomy of did not lead to a reduction in LOX family genes. The 13-LOX subfamily, with seven genes, predominates, while the 9-LOX subfamily is reduced to two genes, an opposite trend from known LOX families of other plant species. As the 13-LOX subfamily is associated with the synthesis of JA/MeJA, its predominance in the Spirodela genome raises the possibility of a higher requirement for the hormone in the aquatic plant. JA-/MeJA-based feedback regulation during culture aging as well as the induction of LOX gene family members within 6 h of salt exposure are demonstrated.
脂氧合酶（LOXs）（EC 1.13.11.12）催化脂肪酸的氧化，并产生氧化脂类，包括植物激素茉莉酸（JA）及其甲酯，茉莉酸甲酯（MeJA）。水生植物中 LOX 基因家族的信息很少。我们在水生植物（大浮萍）中鉴定了一个新的 LOX 基因家族，包含 9 个 LOX 基因。浮萍简化的解剖结构并没有导致 LOX 家族基因的减少。13-LOX 亚家族，有 7 个基因，占主导地位，而 9-LOX 亚家族减少到 2 个基因，与其他植物物种的已知 LOX 家族的趋势相反。由于 13-LOX 亚家族与 JA/MeJA 的合成有关，其在浮萍基因组中的主导地位增加了该激素在水生植物中的更高需求。在培养老化过程中，基于 JA/MeJA 的反馈调节以及盐暴露后 6 小时内 LOX 基因家族成员的诱导得到了证明。
