A mutation in class III homeodomain-leucine zipper (HD-ZIP III) transcription factor results in curly leaf (cul) in cucumber (Cucumis sativus L.)

2018 ◽  
Vol 132 (1) ◽  
pp. 113-123 ◽  
Author(s):  
Fuxi Rong ◽  
Feifan Chen ◽  
Li Huang ◽  
Jiayu Zhang ◽  
Chaowen Zhang ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Cucumis Sativus ◽  
Leucine Zipper ◽  
Class Iii ◽  
Cucumis Sativus L ◽  
Curly Leaf

scholarly journals Control of stem cell niche and fruit development in Arabidopsis thaliana by AGO10/ZWL requires the bHLH transcription factor INDEHISCENT

2020 ◽  
Author(s):  
Manoj Valluru ◽  
Karim Sorefan
Keyword(s):  
Transcription Factor ◽  
Embryonic Development ◽  
Pluripotent Stem Cells ◽  
Apical Meristem ◽  
Leucine Zipper ◽  
Bhlh Transcription Factor ◽  
Loss Of Function ◽  
Class Iii ◽  
Auxin Transporter ◽  
Cell Niche

AbstractBackgroundThe shoot apical meristem (SAM) in plants is composed of a small mound of pluripotent stem cells that generate new organs. ARGONAUTE10 (AGO10) is known to be critical for maintenance of the embryonic SAM by regulating the expression of Class III HOMEODOMAIN-LEUCINE ZIPPER (HD-ZIP III) transcription factors, which then modulate downstream responses to the key phytohormone auxin. However, we do not understand how AGO10 modulates auxin responses after embryogenesis in the mature plant.ResultsHere we show that AGO10 regulates auxin responses in the post-embryonic SAM via the bHLH transcription factor INDEHISCENT (IND). IND directly regulates auxin responses in the SAM regulating the auxin transporter PIN1 via direct transcriptional regulation of PINOID kinase. We show that a loss of function ind mutation significantly restores ago10zwl-3 mutant SAM and fruit phenotypes. ago10zwl-3 mutants overexpress IND and overexpression of IND phenocopies the ago10zwl-3 SAM phenotypes, and regulates auxin transport and responses in the SAM. AGO10 also regulates post-embryonic development in the fruit via a similar genetic pathway.ConclusionsWe characterise a molecular mechanism that is conserved during post embryonic development linking AGO10 directly to auxin responses.

scholarly journals Mating Type in Chlamydomonas Is Specified by mid, the Minus-Dominance Gene

Genetics ◽  
1997 ◽  
Vol 146 (3) ◽  
pp. 859-869 ◽  
Author(s):  
Patrick J Ferris ◽  
Ursula W Goodenough
Keyword(s):  
Transcription Factor ◽  
Mating Type ◽  
Codon Bias ◽  
Leucine Zipper ◽  
Laboratory Strain ◽  
Leucine Zipper Motif ◽  
Type Locus ◽  
Diploid Cells ◽  
Necessary And Sufficient

Diploid cells of Chlamydomonas reinhardtii that are heterozygous at the mating-type locus (mt  +/mt  –) differentiate as minus gametes, a phenomenon known as minus dominance. We report the cloning and characterization of a gene that is necessary and sufficient to exert this minus dominance over the plus differentiation program. The gene, called mid, is located in the rearranged (R) domain of the mt  – locus, and has duplicated and transposed to an autosome in a laboratory strain. The imp11 mt  – mutant, which differentiates as a fusion-incompetent plus gamete, carries a point mutation in mid. Like the fus1 gene in the mt  + locus, mid displays low codon bias compared with other nuclear genes. The mid sequence carries a putative leucine zipper motif, suggesting that it functions as a transcription factor to switch on the minus program and switch off the plus program of gametic differentiation. This is the first sex-determination gene to be characterized in a green organism.

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