Gibberellin and auxin signals control scape cell elongation and proliferation in Agapanthus praecox ssp. orientalis

Yue, Jianhua; Zhang, Di; Ren, Li; Shen, Xiaohui

doi:10.1007/s12374-016-0056-x

Cited by 11 publications

(13 citation statements)

References 43 publications

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“…This response was observed in PBZtreated enrique's crowns (Agapanthus praecox ssp.) in which GA 4 and XET decreased more than 90% in epidermal cells (Yue et al, 2016). In a present study the restriction of cell elongation as a result of gibberellin synthesis inhibition can be observed by means of rising of epidermal cell density (greater number of cell in base of area) ( Figure 1B).…”

Section: Resultssupporting

confidence: 58%

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

et al. 2019

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Inhibiting seedling vegetative growth may be a strategy for improving modulation against biotic and abiotic stresses after transplanting. The objective of this study was to evaluate morphological responses of yellow passion fruit (Passiflora edulis) seedlings to growth inhibition resulted from the application of an inhibitor of gibberellin biosynthesis. The experiment was carried out in a greenhouse using seedlings grown in 290 cm3 polyethylene tubes. At 40 days after emergence, trays containing the seedlings were immersed in solutions at concentrations of 0, 40, 80, 120 and 160 mg (Paclobutrazol) PBZ L-1 up to substrate saturation. These five treatments were laid out in a randomized block design with four replicates. At 15, 30 and 45 days after PBZ application (DAA), basal stem diameter was measured; at 45 DAA, stem diameter, individual leaf area, specific leaf area, root diameter and root volume were measured, lignin content and the anatomy of leaves, stems, and roots were analyzed. Triazole-induced anatomical alterations in stems, leaves and roots cause morphological traits and intensify the specific reagent staining of phenolic compounds and lignin in yellow passion fruit (Passiflora edulis) seedlings.

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Section: Resultssupporting

confidence: 58%

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

et al. 2019

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“…Our observation that gibberellin only affects longitudinal, but not lateral or dorso-ventral expansion rates in maize leaves points at mechanisms that affect wall loosening, particularly perpendicular to the orientation of microfibrils. It is known that gibberellin positively correlates with the expression and activity of xyloglucan endotransglycosylase (XET), an enzyme linked to loosening the bonds between adjacent microfibrils ( Potter and Fry, 1993 ; Smith et al, 1996 ; Jan et al, 2004 ; Yue et al, 2016 ). Also the expression of β-expansin, a non-enzymatic wall protein involved in wall loosening by loosening the microfibril connections, was induced by gibberellin treatments in the internode of rice ( Lee and Kende, 2001 ).…”

Section: Discussionmentioning

confidence: 99%

Gibberellin Enhances the Anisotropy of Cell Expansion in the Growth Zone of the Maize Leaf

et al. 2020

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Although plant organ shapes are defined by spatio-temporal variations of directional tissue expansion, this is a little characterized aspect of organ growth regulation. Although it is well known that the plant hormone gibberellin increases the leaf length/with ratio, its effects on cell expansion in the growing leaf are largely unknown. To understand how variations in rate and anisotropy of growth establish the typical monocotelydonous leaf shape, we studied the leaf growth zone of maize (Zea mays) with a kinematic analysis of cell expansion in the three directions of growth: proximo-distal, medio-lateral, and dorsoventral. To determine the effect of gibberellin, we compared a gibberellin-deficient dwarf3 mutant and the overproducing UBI::GA20OX-1 line with their wild types. We found that, as expected, longitudinal growth was dominant throughout the growth zone. The highest degree of anisotropy occurred in the division zone, where relative growth rates in width and thickness were almost zero. Growth anisotropy was smaller in the elongation zone, due to higher lateral and dorso-ventral growth rates. Growth in all directions stopped at the same position. Gibberellin increased the size of the growth zone and the degree of growth anisotropy by stimulating longitudinal growth rates. Inversely, the duration of expansion was negatively affected, so that mature cell length was unaffected, while width and height of cells were reduced. Our study provides a detailed insight in the dynamics of growth anisotropy in the maize leaf and demonstrates that gibberellin specifically stimulates longitudinal growth rates throughout the growth zone.

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“…The other major determinant of plant architecture is shoot branching 9 . Further investigations have shown that branch length is determined by the interplay between two cellular components of growth: cell size and cell number 10 – 12 . Sachs (1965) reported the essential role of sub-apical meristematic activity in the growth of shoots 13 , and numerous studies have focused on meristems to explore their roles in shoot growth and development.…”

Section: Introductionmentioning

confidence: 99%

“…A relevant study has indicated that cell number is determined by cell division within the shoot apical meristem (SAM), and these cells are enlarged after leaving the meristems 14 . Plant hormones play important roles in cell division and elongation, which determine the final plant architecture 12 , 15 . Studies in Arabidopsis and certain crops suggested that auxin and cytokinin are important phytohormones that interact to control the formation and maintenance of the SAM, and they are linked to the outgrowth of axillary meristems, which drive shoot growth 3 , 16 – 18 .…”

Section: Introductionmentioning

confidence: 99%

Transcriptome analysis of the genes regulating phytohormone and cellular patterning in Lagerstroemia plant architecture

Feng

et al. 2018

Sci Rep

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Plant architecture is a popular research topic because plants with different growth habits that may generate economic or ornamental value are in great demand by orchards and nurseries. However, the molecular basis of the architecture of woody perennial plants is poorly understood due to the complexity of the phenotypic and regulatory relationships. Here, transcriptional profiling of dwarf and non-dwarf crapemyrtles was performed, and potential target genes were identified based on the phenotype, histology and phytohormone metabolite levels. An integrated analysis demonstrated that the internode length was explained mainly by cell number and secondarily by cell length and revealed important hormones in regulatory pathway of Lagerstroemia architecture. Differentially expressed genes (DEGs) involved in phytohormone pathways and cellular patterning regulation were analysed, and the regulatory relationships between these parameters were evaluated at the transcriptional level. Exogenous indole-3-acetic acid (IAA) and gibberellin A4 (GA4) treatments further indicated the pivotal role of auxin in cell division within the shoot apical meristem (SAM) and suggested an interaction between auxin and GA4 in regulating the internode length of Lagerstroemia. These results provide insights for further functional genomic studies on the regulatory mechanisms underlying Lagerstroemia plant architecture and may improve the efficiency of woody plant molecular breeding.

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Gibberellin and auxin signals control scape cell elongation and proliferation in Agapanthus praecox ssp. orientalis

Cited by 11 publications

References 43 publications

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

Gibberellin Enhances the Anisotropy of Cell Expansion in the Growth Zone of the Maize Leaf

Transcriptome analysis of the genes regulating phytohormone and cellular patterning in Lagerstroemia plant architecture

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