α-aminoisobutyric acid mimics the effect of 1-aminocyclopropane-1-carboxylic acid to promote sexual reproduction in the marine red alga Pyropia yezoensis (Rhodophyta)
α-aminoisobutyric acid mimics the effect of 1-aminocyclopropane-1-carboxylic acid to promote sexual reproduction in the marine red alga Pyropia yezoensis (Rhodophyta)
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DOI：
10.1007/s10811-020-02326-7
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发表时间：
2021-01-02
影响因子：
3.3
通讯作者：
Uji, Toshiki
中科院分区：
文献类型：
--
作者：
Endo, Harune;Mizuta, Hiroyuki;Uji, Toshiki
1-氨基环丙烷-1-羧酸 (ACC) 是乙烯的前体，可刺激海洋红藻 Pyropia 物种从营养阶段转变为有性生殖阶段。本研究探讨了乙烯生物合成抑制剂对红藻条斑紫菜配子体有性繁殖的影响，以从功能上了解 ACC 作为红藻植物激素的作用。在这里，我们发现高等植物中 ACC 合成的两种抑制剂 2-氨基乙氧基乙烯基甘氨酸 (AVG) 和氨基氧乙酸 (AOA) 对条斑紫菜的生长和配子发生没有影响。相比之下，外源应用α-氨基异丁酸（AIB）（ACC的结构类似物，在高等植物中阻止ACC转化为乙烯）以与ACC类似的方式诱导精原管和果孢子的形成，而没有内源ACC积累。 AIB 处理未能抑制配子体中乙烯的产生。目前的结果表明，AIB 模仿 ACC 诱导有性生殖的作用，并支持我们之前的研究，即 ACC 在独立于乙烯的有性生殖调节中发挥作用。
1-aminocyclopropane-1-carboxylic acid (ACC), a precursor for ethylene, stimulates the switch from a vegetative to a sexual reproductive phase in the marine red alga Pyropia species. This study explored the effects of ethylene biosynthesis inhibitors on the sexual reproduction of gametophytes of the red alga Pyropia yezoensis to gain a functional understanding of the role of ACC as a plant hormone in red algae. Here we show that two inhibitors of ACC synthesis in higher plants, 2-aminoethoxyvinyl glycine (AVG) and aminooxyacetic acid (AOA), had no effect on the growth and gametogenesis of P. yezoensis. In contrast, exogenous application of alpha-aminoisobutyric acid (AIB), a structural analog of ACC that blocks the conversion of ACC to ethylene in higher plants, induced the formation of spermatangia and carpospores in a similar manner as ACC, without endogenous ACC accumulation. The treatment of AIB failed to inhibit ethylene production in the gametophytes. The present results suggest that AIB mimics the effect of ACC to induce the sexual reproduction and support our previous study that ACC has a role in the regulation of the sexual reproduction independent from ethylene.