Macroautophagy and microautophagy in relation to vacuole formation in mesophyll cells of Dendrobium tepals

Doorn, Wouter G. van; Kirasak, Kanjana; Ketsa, Saichol

doi:10.1016/j.jplph.2015.01.006

Cited by 13 publications

(3 citation statements)

References 16 publications

(15 reference statements)

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“…At the structural level, the most pronounced effect of sPGR application was a limited cellular damage in the inner parts of shoot bases. Shoots developed in Ni(+) without sPGRs suffered from serious cellular disorganization, mainly the formation of microvesicles and multilamellar bodies, suggesting autophagy (van Doorn et al 2015 ), and chloroplast degradation. Such alterations were also apparent in sPGR-treated shoots, but they were limited to the cells of external layers.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the protective role of exogenous growth regulators against Ni toxicity in woody shrub Daphne jasminea

Wiszniewska

Muszyńska

Hanus-Fajerska

et al. 2018

Planta

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Main conclusion The results provide a significant verification of the activity of exogenously applied phytohormones: gibberellic acid, jasmonic acid, and brassinolide in the modulation of the plant’s response to nickel treatment. AbstractThe study investigated nickel accumulation and its toxicity to Daphne jasminea shoots cultured in vitro with or without exogenous supplementation with phytohormones: gibberellic acid (GA3), jasmonic acid (JA), and brassinolide (BL). The aim was to verify the modulatory effect of exogenous plant growth regulators (PGRs) on plant reaction to Ni excess. The combined action of Ni and PGRs was evaluated at the anatomical, ultrastructural, and biochemical levels. Nickel toxicity was manifested in decreased biomass accretion and growth tolerance index (83–53.6%), attributed to enhanced synthesis of growth inhibitors, mainly abscisic acid. As a defence reaction, endogenous gibberellins accumulated. Exogenous GA3 ameliorated the plant reaction to Ni stress, inducing proliferation and growth rate. Ni tolerance in the presence of GA3 was attributed to peroxisomal reactions that stimulated the synthesis of endogenous JA. In contrast, the application of BL caused enhanced Ni accumulation. Plants suffered from pronounced stress due to massive oxidation. The defence strategy of plants subjected to Ni and BL involved cell wall rearrangements. Exogenous JA stimulated the synthesis of active auxins and salicylic acid, contributing to enhanced mitotic activity within explants. However, JA disturbed the integrity of chloroplasts and lamellar compartments. Our study revealed that an action of exogenous PGRs may either enhance tolerance to Ni or increase metal toxicity in D. jasminea. Particularly in in vitro culture, where explants are subjected to external phytohormonal stimuli, the combined effects of supplemental PGRs may enhance stress and substantially affect plant development. Our results provide a significant verification of exogenous PGRs activity in the modulation of plant response to nickel.Electronic supplementary materialThe online version of this article (10.1007/s00425-018-2979-6) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the protective role of exogenous growth regulators against Ni toxicity in woody shrub Daphne jasminea

Wiszniewska

Muszyńska

Hanus-Fajerska

et al. 2018

Planta

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“…In fact, autophagy is not always related to PCD. This process is responsible for vacuole biogenesis and the formation of the dominant central vacuole ( van Doorn et al , 2015 ; Machado and Rodrigues, 2019 ), in addition to maintenance of homeostasis ( Inoue et al , 2006 ; Yano et al , 2007 ). It is also activated during dynamically dividing cells ( Cheng at al., 2022 ), given that we showed ATG8 occurrence in the pericycle.…”

Section: Discussionmentioning

confidence: 99%

Conserved autophagy and diverse cell wall composition: unifying features of vascular tissues in evolutionarily distinct plants

Michalak,

Wojciechowska,

Marzec-Schmidt

et al. 2024

Annals of Botany

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Background and Aims The formation of multifunctional vascular tissues represents a significant advancement in plant evolution. Differentiation of conductive cells is specific, involving two main pathways – protoplast clearance and cell wall modification. In xylogenesis, autophagy is a crucial process of the complete protoplast elimination in tracheary elements, whose cell wall also undergoes strong changes. Knowledge pertaining to living sieve elements, which lose most of their protoplast during phloemogenesis, remains limited. We hypothesized that autophagy plays a critical role, not only in xylem complete cytoplasmic clearance but also in partial degradation in phloem. Cell wall elaborations of mature sieve elements are not so extensive. These analyses performed on evolutionary diverse model species potentially make it possible to understand phloemogenesis to an equal extent as xylogenesis. Methods We investigated the distribution of ATG8 protein, which is an autophagy marker, and cell wall components in the roots of ferns, gymnosperms, and angiosperms (monocots, dicot herbaceous plants, and trees). Furthermore, we conducted a bioinformatic analysis of complete data on ATG8 isoforms for Ceratopteris richardii. Key Results The presence of ATG8 protein was confirmed in both tracheary elements and sieve elements; however, the composition of cell wall components varied considerably among vascular tissues in the selected plants. Arabinogalactan proteins and β-1,4-galactan were detected in the roots of all studied species, suggesting their potential importance in phloem formation or function. In contrast, no evolutionary pattern was observed for xyloglucan, arabinan, or homogalacturonan. Conclusions Our study's findings indicate that the involvement of autophagy in plants is universal during the development of tracheary elements that are dead at maturity and sieve elements that remain alive. Given the conserved nature of autophagy, and its function in protoplast degradation for uninterrupted flow, autophagy may have played a vital role in the development of increasingly complex biological organizations, including the formation of vascular tissues. On the other hand, different cell wall compositions of xylem and phloem in different species may indicate diverse functionality and potential of substance transport, which is critical in plant evolution.

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“…The structure of the material inside the lumen varied from that of the cytoplasm to be uniformly electron‐translucent, indicating that the enclosed cytoplasmic material had become completely digested. No evidence was found that the material engulfed by the plastid or indeed that the whole plastid had become transferred to the vacuole (van Doorn et al., 2011, 2015). Taken together, these data might indicate that the observed plastids (a) show coordinated invagination of their envelope, which resulted in an intraplastidial space; (b) exhibit a structure in this space, which is very similar to that of the cytoplasm, suggesting movement of cytoplasm into the plastid at the time of the invagination; (c) show acid phosphatase activity, including activity in the lumen of the intraplastidial space; and (d) reveal various apparent stages of degradation of the material inside the lumen of the intraplastidial spaces.…”

Section: Postharvest Physiologymentioning

confidence: 99%

The Dendrobium Orchid: Botany, horticulture, and utilization

Ketsa

Warrington

2023

Crop Science

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Dendrobium, one of the largest genera of tropical orchids, is grown commercially on a large scale with an important economic impact in several ASEAN countries.Dendrobium orchids can be grown in a wide range of climates, but flower production is best under tropical conditions. Due to being the most popular orchid for cut flower production, many hybrids of Dendrobium have been produced with colorful and attractive blooms. Cut flowers of Dendrobium are popular worldwide. In addition, many Dendrobium cultivars can be grown as flowering potted plants and for other purposes such as in medicinal applications and for use in decorative products. Postharvest physiology and technology are important in maintaining the quality of both cut flowers and potted plants from production sites to the marketplace. Plants of the Dendrobium genus also contain a wide diversity of bioactive compounds that can be developed into medicinal and cosmetic products. This review describes the botany, cultivation, postharvest physiology, handling and utilization of Dendrobium.

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Macroautophagy and microautophagy in relation to vacuole formation in mesophyll cells of Dendrobium tepals

Cited by 13 publications

References 16 publications

Evaluation of the protective role of exogenous growth regulators against Ni toxicity in woody shrub Daphne jasminea

Evaluation of the protective role of exogenous growth regulators against Ni toxicity in woody shrub Daphne jasminea

Conserved autophagy and diverse cell wall composition: unifying features of vascular tissues in evolutionarily distinct plants

The Dendrobium Orchid: Botany, horticulture, and utilization

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