Wu Jinfeng, Yamaguchi Nobutoshi, Ito Toshiro
a Division of Biological Science , Nara Institute of Science and Technology , Takayama, Ikoma , Nara , Japan.
b Precursory Research for Embryonic Science and Technology , Japan Science and Technology Agency , Saitama , Japan.
Plant Signal Behav. 2019;14(7):1604019. doi: 10.1080/15592324.2019.1604019. Epub 2019 Apr 13.
Abscisic acid (ABA) plays critical roles during plant growth and development in response to various stresses. histone demethylases JUMONJI-C DOMAIN-CONTAINING PROTEIN 30 (JMJ30) and JMJ32 control ABA-mediated growth arrest during the post-germination stage (2-3 days after germination). However, the roles of JMJ30 and JMJ32 in ABA responses at later stages of plant development remain largely unknown. Here, we show that JMJ30 and JMJ32 mediate ABA responses during root development. In the presence of ABA, double mutants display longer primary roots than the wild type. Loss-of-function mutation in the () gene also led to a longer primary root phenotype in response to ABA. Analysis of and expression suggested that they act in the same pathway to mediate ABA responses during root elongation at the seedling stage. Our findings highlight the importance of the JMJ30/JMJ32-SnRK2.8 module at two different developmental stages.
脱落酸（ABA）在植物生长发育过程中对各种胁迫的响应中起着关键作用。组蛋白去甲基化酶JUMONJI-C结构域包含蛋白30（JMJ30）和JMJ32在种子萌发后阶段（萌发后2 - 3天）控制ABA介导的生长停滞。然而，JMJ30和JMJ32在植物发育后期ABA响应中的作用仍 largely未知。在这里，我们表明JMJ30和JMJ32在根发育过程中介导ABA响应。在ABA存在的情况下，双突变体的初生根比野生型更长。（）基因的功能缺失突变也导致对ABA响应时出现更长的初生根表型。对和表达的分析表明，它们在同一途径中起作用，在幼苗期根伸长过程中介导ABA响应。我们的发现突出了JMJ30/JMJ32 - SnRK2.8模块在两个不同发育阶段的重要性。
