scispace - formally typeset
Search or ask a question
Author

José Gentilhomme-Le Gourrierec

Other affiliations: University of Angers
Bio: José Gentilhomme-Le Gourrierec is an academic researcher from Université Nantes Angers Le Mans. The author has contributed to research in topics: Auxin & Cytokinin. The author has an hindex of 2, co-authored 2 publications receiving 338 citations. Previous affiliations of José Gentilhomme-Le Gourrierec include University of Angers.
Topics: Auxin, Cytokinin

Papers
More filters
Journal ArticleDOI
TL;DR: An overview of UV- and blue-radiations signaling pathways in some key physiological processes is presented and effects of plant exposure to these wavelengths on phenotype as well as on contents in useful metabolites and resistance to bio aggressors are described.

278 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the effect of sucrose involves changes in the hormonal network related to bud outgrowth, and potential hormones involved in sugar control are identified.
Abstract: Sugar has only recently been identified as a key player in triggering bud outgrowth, while hormonal control of bud outgrowth is already well established. To get a better understanding of sugar control, the present study investigated how sugar availability modulates the hormonal network during bud outgrowth in Rosa hybrida. Other plant models, for which mutants are available, were used when necessary. Buds were grown in vitro to manipulate available sugars. The temporal patterns of the hormonal regulatory network were assessed in parallel with bud outgrowth dynamics. Sucrose determined bud entrance into sustained growth in a concentration-dependent manner. Sustained growth was accompanied by sustained auxin production in buds, and sustained auxin export in a DR5::GUS-expressing pea line. Several events occurred ahead of sucrose-stimulated bud outgrowth. Sucrose upregulated early auxin synthesis genes (RhTAR1, RhYUC1) and the auxin efflux carrier gene RhPIN1, and promoted PIN1 abundance at the plasma membrane in a pPIN1::PIN1-GFP-expressing tomato line. Sucrose downregulated both RwMAX2, involved in the strigolactone-transduction pathway, and RhBRC1, a repressor of branching, at an early stage. The presence of sucrose also increased stem cytokinin content, but sucrose-promoted bud outgrowth was not related to that pathway. In these processes, several non-metabolizable sucrose analogues induced sustained bud outgrowth in R. hybrida, Pisum sativum, and Arabidopsis thaliana, suggesting that sucrose was involved in a signalling pathway. In conclusion, we identified potential hormonal candidates for bud outgrowth control by sugar. They are central to future investigations aimed at disentangling the processes that underlie regulation of bud outgrowth by sugar.

186 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: It is suggested that it might be possible to improve crop health at high planting densities by targeting links between phyB and JA signalling, in particular salicylic acid and jasmonic acid.
Abstract: Plants use photoreceptor proteins to detect the proximity of other plants and to activate adaptive responses. Of these photoreceptors, phytochrome B (phyB), which is sensitive to changes in the red (R) to far-red (FR) ratio of sunlight, is the one that has been studied in greatest detail. The molecular connections between the proximity signal (low R:FR) and a model physiological response (increased elongation growth) have now been mapped in considerable detail in Arabidopsis seedlings. We briefly review our current understanding of these connections and discuss recent progress in establishing the roles of other photoreceptors in regulating growth-related pathways in response to competition cues. We also consider processes other than elongation that are controlled by photoreceptors and contribute to plant fitness under variable light conditions, including photoresponses that optimize the utilization of soil resources. In examining recent advances in the field, we highlight emerging roles of phyB as a major modulator of hormones related to plant immunity, in particular salicylic acid and jasmonic acid (JA). Recent attempts to manipulate connections between light signals and defence in Arabidopsis suggest that it might be possible to improve crop health at high planting densities by targeting links between phyB and JA signalling.

303 citations

Journal ArticleDOI
TL;DR: This review presents the state of the art in perception of red (R) and far-red (FR) wavelengths and of the R:FR ratio by plants, phenotypic plant responses, and the molecular mechanisms related to these responses and the mechanisms underlying these differences in plant responses are addressed.

275 citations

Journal ArticleDOI
TL;DR: In this paper, an amalgamation of the recent research achievements in the horticulture and floriculture industry, ranging from greenhouse applications to climate rooms and vertical farming, is presented.

194 citations

Journal ArticleDOI
TL;DR: Inside the buds, the TEOSINTE BRANCHED1, CYCLOIDEA, PCF (TCP) transcriptional regulator BRAN CHED1 (BRC1) binds to and positively regulates the transcription of three related Homeodomain leucine zipper protein (HD-ZIP)-encoding genes, which enhance 9-CIS-EPOXICAROTENOID DIOXIGENASE 3 (NCED3) expression, lead
Abstract: Shoot-branching patterns determine key aspects of plant life and are important targets for crop breeding. However, we are still largely ignorant of the genetic networks controlling locally the most important decision during branch development: whether the axillary bud, or branch primordium, grows out to give a lateral shoot or remains dormant. Here we show that, inside the buds, the TEOSINTE BRANCHED1, CYCLOIDEA, PCF (TCP) transcription factor BRANCHED1 (BRC1) binds to and positively regulates the transcription of three related Homeodomain leucine zipper protein (HD-ZIP)-encoding genes: HOMEOBOX PROTEIN 21 (HB21), HOMEOBOX PROTEIN 40 (HB40), and HOMEOBOX PROTEIN 53 (HB53). These three genes, together with BRC1, enhance 9-CIS-EPOXICAROTENOID DIOXIGENASE 3 (NCED3) expression, lead to abscisic acid accumulation, and trigger hormone response, thus causing suppression of bud development. This TCP/HD-ZIP genetic module seems to be conserved in dicot and monocotyledonous species to prevent branching under light-limiting conditions.

186 citations

Journal ArticleDOI
TL;DR: This work has highlighted that auxin export from a bud is important for its subsequent growth, and perception of the recently discovered hormone strigolactone is now quite well understood, while the downstream targets remain largely unknown.

186 citations