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首页> 外文期刊>Journal of Experimental Botany >Regulation of ethylene-related gene expression by indole-3-acetic acid and 4-chloroindole-3-acetic acid in relation to pea fruit and seed development
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Regulation of ethylene-related gene expression by indole-3-acetic acid and 4-chloroindole-3-acetic acid in relation to pea fruit and seed development

机译：吲哚-3-乙酸和4-氯吲哚-3-乙酸与豌豆果和种子发育的乙烯相关基因表达的调节

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In pea, the auxins 4-chloroindole-3-acetic acid (4-Cl-IAA) and indole-3-acetic acid (IAA) occur naturally; however, only 4-Cl-IAA stimulates pericarp growth and gibberellin (GA) biosynthesis, and inhibits the ethylene response in deseeded ovaries (pericarps), mimicking the presence of seeds. Expression of ovary ethylene biosynthesis genes was regulated similarly in most cases by the presence of 4-Cl-IAA or seeds. PsACS1 [which encodes an enzyme that synthesizes 1-aminocyclopropane-1-carboxylic acid (ACC)] transcript abundance was high in pericarp tissue adjacent to developing seeds following pollination. ACC accumulation in 4-Cl-IAA-treated deseeded pericarps was driven by high PsASC1 expression (1800-fold). 4-Cl-IAA, but not IAA, also suppressed the pericarp transcript levels of PsACS4. 4-Cl-IAA increased PsACO1 and decreased PsACO2 and PsACO3 expression (enzymes that convert ACC to ethylene) but did not change ACO enzyme activity. Increased ethylene was countered by a 4-Cl-IAA-specific decrease in ethylene responsiveness potentially via modulation of pericarp ethylene receptor and signaling gene expression. This pattern did not occur in IAA-treated pericarps. Overall, the effect of 4-Cl-IAA and IAA on ethylene biosynthesis gene expression generally explains the ethylene evolution patterns, and their effects on GA biosynthesis and ethylene signaling gene expression explain the tissue response patterns in young pea ovaries.
机译：在豌豆中，天然植物4-氯吲哚-3-乙酸（4-Cl-IAA）和吲哚-3-乙酸（IAA）自然发生;然而，只有4-cl-IAA刺激果罗特生长和嗜酸性蛋白（GA）生物合成，并抑制在预留的卵巢（Pericarps）中的乙烯反应，以模仿种子的存在。在大多数情况下，在大多数情况下，在大多数情况下，在大多数情况下在大多数情况下进行调节卵巢乙烯生物合成基因的表达。 PSACS1 [编码合成1-氨基环丙烷-1-羧酸（ACC）的酶的酶]转录物丰度在授粉后的显影种子与显影种子相邻的Pericarp组织中高。 4-Cl-IAA治疗的预终止中的ACC积累由高psasc1表达（1800倍）驱动。 4-Cl-IAA，但不是IAA，也抑制了PSACS4的PERICARP转录水平。 4-CL-IAA增加的PSACO1和降低的PSACO2和PSACO 3表达（转化ACC对乙烯的酶）但未改变ACO酶活性。通过调节Pericarp乙烯受体和信号传导基因表达，通过调节乙烯反应性的4-Cl-IAA特异性降低来抵抗增加的乙烯。这种模式在IAA治疗的果皮中没有发生。总体而言，4-Cl-IAA和IAA对乙烯生物合成基因表达的影响通常解释了乙烯进化模式，它们对Ga生物合成和乙烯信号传导基因表达的影响解释了幼豌豆卵巢中的组织反应模式。

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