2018
DOI: 10.1242/dev.163865
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Abstract: Ovule formation is a complex developmental process in plants, with a strong impact on the production of seeds. Ovule primordia initiation is controlled by a gene network, including components of the signaling pathways of auxin, brassinosteroids and cytokinins. By contrast, gibberellins (GAs) and DELLA proteins, the negative regulators of GA signaling, have never been shown to be involved in ovule initiation. Here, we provide molecular and genetic evidence that points to DELLA proteins as novel players in the d… Show more

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Cited by 43 publications
(77 citation statements)
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“…We have demonstrated in the Micro‐Tom (MT) cultivar of tomato ( Solanum lycopersicum ) that GAs control ovule number (Gomez et al , ). Ovule number was reduced in GA‐treated plants, in the DELLA lost‐of‐function mutant procera (a null allele of PROCERA , the only DELLA gene in tomato; Carrera et al , ), and in the transgenic line that constitutively overexpresses the GA biosynthetic gene CcGA20ox1 from citrus.…”
Section: Resultsmentioning
confidence: 99%
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“…We have demonstrated in the Micro‐Tom (MT) cultivar of tomato ( Solanum lycopersicum ) that GAs control ovule number (Gomez et al , ). Ovule number was reduced in GA‐treated plants, in the DELLA lost‐of‐function mutant procera (a null allele of PROCERA , the only DELLA gene in tomato; Carrera et al , ), and in the transgenic line that constitutively overexpresses the GA biosynthetic gene CcGA20ox1 from citrus.…”
Section: Resultsmentioning
confidence: 99%
“…Increased ovule number per pistil could be due to increase in ovary length, which maintains ovule density in the placenta, rather than a specific increase in ovule density with no alteration in ovary length. In the pistil of gai‐1 , the significant increase in ovule number is accompanied by a slight increase in ovary length, resulting in increased ovule density (Gomez et al , ). To test whether BRs could also control ovule number independently of ovary length, we determined ovule number, ovary length and the ratio of ovule number to ovary length from the single and double‐mutants of gai‐1 and bzr1‐1D (Figure S3 and Table S1).…”
Section: Resultsmentioning
confidence: 99%
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“…An increase in cytokinin levels due to loss of cytokinin degrading enzymes causes an increase in ovule number per flower, possibly by upregulation of PIN1 levels 7 . Other phytohormones involved are Gibberellins (GAs) and Brassinolide (BR), which act antagonistically to restrict (GA) or promote (BR) ovule formation via regulation of cytokinin signalling 8, 9 . In response to auxin, the transcription factor MONOPTEROS/AUXIN RESPONSE FACTOR5 (MP/ARF5) is activated and regulates the expression of the transcription factors AINTEGUMENTA (ANT), CUP SHAPED COTYLEDON1 (CUC1) and CUC2 in ovule primordia and the boundary domains between ovules, respectively 10 .…”
Section: Introductionmentioning
confidence: 99%