2020
DOI: 10.1111/nph.16713
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ABI5 modulates seed germination via feedback regulation of the expression of the PYR/PYL/RCAR ABA receptor genes

Abstract: As abscisic acid (ABA) receptors, PYR1/PYL/RCAR (PYLs) play important roles in ABA-mediated seed germination, but the regulation of PYLs in this process, especially at the transcriptional level, remains unclear. In this study, we found that expression of 11 of 14 PYLs changes significantly during seed germination and is affected by exogenous ABA. Two PYLs, PYL11 and PYL12, both of which are expressed specifically in mature seeds, positively modulate ABA-mediated seed germination. However, ABI5 was found to mod… Show more

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Cited by 126 publications
(82 citation statements)
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“…Thus far, MED25 has been implicated in performing various regulatory functions in the hormone signaling pathways (jasmonic acid (JA), abscisic acid (ABA), auxin, and ethylene), biotic and abiotic stress responses and developmental processes (Kazan, 2017). Extensive evidence indicates that MED25 is a master regulator of JA signaling due to the findings of the attenuated expression of JA responsive genes in med25 mutant as well as MED25's direct interaction with various JA‐related TFs, activators, and repressors (Kidd et al, 2009, 2010; Ou et al, 2011; Cevik et al, 2012; Chen et al, 2012; Yang et al, 2015; Wang et al, 2019; You et al, 2019; Zhai and Li, 2019). In addition to playing a role in the JA signaling, MED25 also positively contributes to auxin and ethylene signaling (Yang et al, 2014; Ito et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…Thus far, MED25 has been implicated in performing various regulatory functions in the hormone signaling pathways (jasmonic acid (JA), abscisic acid (ABA), auxin, and ethylene), biotic and abiotic stress responses and developmental processes (Kazan, 2017). Extensive evidence indicates that MED25 is a master regulator of JA signaling due to the findings of the attenuated expression of JA responsive genes in med25 mutant as well as MED25's direct interaction with various JA‐related TFs, activators, and repressors (Kidd et al, 2009, 2010; Ou et al, 2011; Cevik et al, 2012; Chen et al, 2012; Yang et al, 2015; Wang et al, 2019; You et al, 2019; Zhai and Li, 2019). In addition to playing a role in the JA signaling, MED25 also positively contributes to auxin and ethylene signaling (Yang et al, 2014; Ito et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…The ABA signaling pathway mainly relies on OsbZIP transcription factors, including AREBs, ABFs, and ABI5. Among these, ABI5 plays a key role in suppressing ABA-mediated seed germination and post-germination growth in a number of plant species, such as Arabidopsis [13,40,41], rice [42], wheat [43,44], barley [45], and Sorghum [46]. In addition to the roles of these classical bZIP transcriptional factors in the ABA pathway, several other bZIP members are also involved in the ABAmediated regulation of seed dormancy and germination in rice.…”
Section: Discussionmentioning
confidence: 99%
“…This family has been reported to be involved in ABA-mediated seed germination [ 32 ]. In Arabidopsis , PYR1-PYL1-PYL2-PYL4 [ 31 ], PYL12 [ 50 ], and PYL13 [ 51 ] act as positive regulators of ABA signaling during seed germination and early seedling development. Among these, PYL12 expression was found to be high in mature dry seeds but dropped sharply after germination [ 50 ].…”
Section: Discussionmentioning
confidence: 99%
“…In Arabidopsis , PYR1-PYL1-PYL2-PYL4 [ 31 ], PYL12 [ 50 ], and PYL13 [ 51 ] act as positive regulators of ABA signaling during seed germination and early seedling development. Among these, PYL12 expression was found to be high in mature dry seeds but dropped sharply after germination [ 50 ]. This is consistent with our results, suggesting that significantly downregulated PYL12-like (evm.TU.scaffold_61.29) prevents ABA signal transduction and thereby breaks the dormancy of seeds.…”
Section: Discussionmentioning
confidence: 99%