Leaf‐shape remodeling: programmed cell death in fistular leaves of <i><scp>A</scp>llium fistulosum</i>

Ni, Xilu; Su, Hui; Zhou, Yafu; Wang, Fenghua; Liu, Wenzhe

doi:10.1111/ppl.12255

Cited by 16 publications

(16 citation statements)

References 76 publications

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“…Welsh onion plants have fistular leaves; the fistular lamina change from solid to hollow during development, and the cells around the cavity break up until the remaining 1-2 layers of cells from the palisade show cell wall residues (i.e., "arrowheads") [30]. Under B light, red-green staining of leaf slices revealed similarly sized and tightly arranged palisade tissue in each layer with dense Chl.…”

Section: Leaf Anatomy and Chloroplast Ultrastructure Of Welsh Onions mentioning

confidence: 99%

Photosynthetic characteristics and chloroplast ultrastructure of welsh onion (Allium fistulosum L.) grown under different LED wavelengths

Gao

Liu

et al. 2020

BMC Plant Biol

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Background: The optimized illumination of plants using light-emitting diodes (LEDs) is beneficial to their photosynthetic performance, and in recent years, LEDs have been widely used in horticultural facilities. However, there are significant differences in the responses of different crops to different wavelengths of light. Thus, the influence of artificial light on photosynthesis requires further investigation to provide theoretical guidelines for the light environments used in industrial crop production. In this study, we tested the effects of different LEDs (white, W; blue, B; green, G; yellow, Y; and red, R) with the same photon flux density (300 μmol/m 2 •s) on the growth, development, photosynthesis, chlorophyll fluorescence characteristics, leaf structure, and chloroplast ultrastructure of Welsh onion (Allium fistulosum L.) plants. Results: Plants in the W and B treatments had significantly higher height, leaf area, and fresh weight than those in the other treatments. The photosynthetic pigment content and net photosynthetic rate (P n) in the W treatment were significantly higher than those in the monochromatic light treatments, the transpiration rate (E) and stomatal conductance (G s) were the highest in the B treatment, and the intercellular CO 2 concentration (C i) was the highest in the Y treatment. The non-photochemical quenching coefficient (NPQ) was the highest in the Y treatment, but the other chlorophyll fluorescence characteristics differed among treatments in the following order: W > B > R > G > Y. This includes the maximum photochemical efficiency of photosystem II (PSII) under dark adaptation (Fv/Fm), maximum photochemical efficiency of PSII under light adaptation (Fv′/Fm′), photochemical quenching coefficient (qP), actual photochemical efficiency (ΦPSII), and apparent electron transport rate (ETR). Finally, the leaf structure and chloroplast ultrastructure showed the most complete development in the B treatment. Conclusions: White and blue light significantly improved the photosynthetic efficiency of Welsh onions, whereas yellow light reduced the photosynthetic efficiency.

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Section: Leaf Anatomy and Chloroplast Ultrastructure Of Welsh Onions mentioning

confidence: 99%

Photosynthetic characteristics and chloroplast ultrastructure of welsh onion (Allium fistulosum L.) grown under different LED wavelengths

Gao

Liu

et al. 2020

BMC Plant Biol

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“…DNA cleavage and TUNEL positive nuclei found in the pith cells during pith cavity formation further suggested that PCD might play an important role in this process (Figure ). The whole process is similar to the programmed cell death during the fistular leaf formation of Allium fistulosum (Ni et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Morphological dissection and cellular and transcriptome characterizations of bamboo pith cavity formation reveal a pivotal role of genes related to programmed cell death

Guo

Sun

et al. 2018

Plant Biotechnology Journal

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Summary Pith cavity formation is critical for bamboo to overcome the bending force during its fast growth; however, the underlying molecular mechanisms remain largely unknown. Multiple approaches, including anatomical dissection, mathematical modelling and transcriptome profiling, were employed in this study to investigate the biology of pith cavity formation in bamboo Pseudosasa japonica . We found that the corruption of pith tissue occurred sequentially and asymmetrically from the top‐centre of the internode down to the bottom, which might be caused by the combined effects of asymmetrical radial and axial tensile forces during shoot‐wall cell elongation and spiral growth of bamboo internodes. Programmed cell death ( PCD ) in pitch manifested by TUNEL positive nuclei, DNA cleavage and degraded organelles, and potentially regulated by ethylene and calcium signalling pathway, ROS burst, cell wall modification, proteolysis and nutrient recycle genes, might be responsible for pith tissue corruption of Ps. japonica . Although similar physiological changes and transcriptome profiles were found in different bamboo species, different formation rates of pith cavity were observed, which might be caused by different pith cells across the internode that were negatively correlated with the culm diameter. These findings provided a systematical view on the formation of bamboo pith cavity and revealed that PCD plays an important role in the bamboo pith cavity formation.

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“…For example, only the abaxial identity existed in leaf blades results in a unifacial fistular leaf in Welsh onion [33, 34] However, the formation of fistular leaf cavities is still poorly understood. Although that a cellular investigation of the leaves of A. fistulosum found that the process of fistular leaf formation involved PCD [2], molecular evidences for the involvement of PCD in the formation of fistular leaf cavities is still unknown in Allium .…”

Section: Discussionmentioning

confidence: 99%

“…Varied leaf shapes can be observed among Allium species, including flat, columnar, solid, and fistular morphologies. Morphological and cellular studies have found that fistular leaves develop from solid precursors [2]. Developmental investigation of the leaves of A. fistulosum found that the process of fistular leaf formation involved programmed cell death (PCD) [2].…”

Section: Introductionmentioning

confidence: 99%

“…Morphological and cellular studies have found that fistular leaves develop from solid precursors [2]. Developmental investigation of the leaves of A. fistulosum found that the process of fistular leaf formation involved programmed cell death (PCD) [2]. PCD is a spontaneous, programmed, self-destructive cellular process that plays a key role in tissue differentiation, homeostasis, and organ morphogenesis, including that of leaves [3–5].…”

Section: Introductionmentioning

confidence: 99%

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Comparative transcriptomics provide insight into the morphogenesis and evolution of fistular leaves in Allium

et al. 2017

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BackgroundFistular leaves frequently appear in Allium species, and previous developmental studies have proposed that the process of fistular leaf formation involves programmed cell death. However, molecular evidence for the role of programmed cell death in the formation of fistular leaf cavities has yet to be reported.ResultsIn this study, we characterized the leaf transcriptomes of nine Allium species, including six fistular- and three solid-leaved species. In addition, we identified orthologous genes and estimated their Ka and Ks values, in order to ascertain their selective pattern. Phylogenetic analysis based on the transcriptomes revealed that A. tuberosum was the most ancestral among the nine species, and analysis of orthologous genes between A. tuberosum and the other eight species indicated that 149 genes were subject to positive selection; whereas >3000 had undergone purifying selection in each species.ConclusionsWe found that many genes that are potentially related to programmed cell death either exhibited rapid diversification in fistular-leaved species, or were conserved in solid-leaved species in evolutionary history. These genes potentially involved in programmed cell death might play important roles in the formation of fistular leaf cavities in Allium, and the differing selection patterns in fistular- and solid-leaved species may be responsible for the evolution of fistular leaves.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-3474-8) contains supplementary material, which is available to authorized users.

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Leaf‐shape remodeling: programmed cell death in fistular leaves of Allium fistulosum

Cited by 16 publications

References 76 publications

Photosynthetic characteristics and chloroplast ultrastructure of welsh onion (Allium fistulosum L.) grown under different LED wavelengths

Photosynthetic characteristics and chloroplast ultrastructure of welsh onion (Allium fistulosum L.) grown under different LED wavelengths

Morphological dissection and cellular and transcriptome characterizations of bamboo pith cavity formation reveal a pivotal role of genes related to programmed cell death

Comparative transcriptomics provide insight into the morphogenesis and evolution of fistular leaves in Allium

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