2019
DOI: 10.1105/tpc.18.00803
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The Transcription Factors TCP4 and PIF3 Antagonistically Regulate Organ-Specific Light Induction of SAUR Genes to Modulate Cotyledon Opening during De-Etiolation in Arabidopsis

Abstract: Light elicits different growth responses in different organs of plants. These organ-specific responses are prominently displayed during de-etiolation. While major light-responsive components and early signaling pathways in this process have been identified, this information has yet to explain how organ-specific light responses are achieved. Here, we report that members of the TEOSINTE BRANCHED1, CYCLOIDEA, and PCF (TCP) transcription factor family participate in photomorphogenesis and facilitate light-induced … Show more

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Cited by 78 publications
(75 citation statements)
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“…However, we observed that PP6 mutations did not further enhance the cotyledon separation of pifq mutant, probably because PP6 may mediate cotyledon development by factors other than PIFs. SAUR genes, which are auxin-responsive genes, have been shown to be the major factors regulating cotyledon opening (29,30). We found that several SAURs were up-regulated to higher levels in pifq than those in f1 f3 (e.g., SAUR51) or down-regulated in f1 f3 (e.g., SAUR14, SAUR16) (Dataset S1), which could be part of the reason why f1 f3 did not further enhance the cotyledon separation phenotype of pifq mutant.…”
Section: Discussionmentioning
confidence: 99%
“…However, we observed that PP6 mutations did not further enhance the cotyledon separation of pifq mutant, probably because PP6 may mediate cotyledon development by factors other than PIFs. SAUR genes, which are auxin-responsive genes, have been shown to be the major factors regulating cotyledon opening (29,30). We found that several SAURs were up-regulated to higher levels in pifq than those in f1 f3 (e.g., SAUR51) or down-regulated in f1 f3 (e.g., SAUR14, SAUR16) (Dataset S1), which could be part of the reason why f1 f3 did not further enhance the cotyledon separation phenotype of pifq mutant.…”
Section: Discussionmentioning
confidence: 99%
“…Noteworthily, PaTCP21 and PaTCP23 represent a relatively high level of expression in developing fruits, suggesting they may play roles in fruit development. PaTCP9, PaTCP14b, PaTCP20, PaTCP21 and PaTCP23 are transcribed at the highest levels in cotyledons, suggesting their potential roles in cotyledon development, similar to the TCP4-like genes in Arabidopsis [8,33,60].…”
Section: Expression Patterns and Potential Functions Of Patcp Genesmentioning
confidence: 97%
“…Moreover, the transcripts of most putative miR319-regulated PaTCP genes are detected in most tested tissues, including seedlings, cotyledons, leaves, axillary buds, inflorescences and flower buds, suggesting that these PaTCPs may play diverse regulatory roles at multiple developmental processes in petunia. Recently, the TCP4-like genes were proved to play a positive role in light-induced cotyledon opening via directly targeting and transcriptionally activating several SAUR (SMALL AUXIN UPREGULATED RNA) genes in Arabidopsis [60]. AtTCP4 is predominantly expressed in cotyledons and young leaves [8] and regulates the morphogenesis of these organs [33].…”
Section: Expression Patterns and Potential Functions Of Patcp Genesmentioning
confidence: 99%
“…The TFs TCP4 and PIF3 antagonistically regulate the expression of SAUR16/50 to control cotyledon opening during de-etiolation. The opposite effects of TCP4 and PIF3 might help ensure the specific and proper expression of the target genes (Sun et al, 2016;Dong et al, 2019). To date, TCP4-PIF3-SAUR16/50 is the only known regulatory module that mediates the differential growth; additional players and mechanisms have not yet been examined.…”
Section: Organ-specific Transcriptional Responses To Lightmentioning
confidence: 99%