Sugar starvation induces the central vacuolation with coordinated increase in expression of tonoplast intrinsic protein genes in suspension-cultured rice cells

Lim, Mi-na; Choi, Siyoung Q.; Lee, Sungeun; Eom, Chi-Yong; Yoon, In Sun; Hwang, Yong-sic

doi:10.1007/s12374-016-0455-z

Cited by 3 publications

(2 citation statements)

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“…The translocation and compartmentalization of Phase II conjugates in the plant organelles with storage functions (e.g., vacuole) are defined as Phase III metabolism. , As one of the prominent sequestration organelles, the plant vacuole plays a key role in storing hazardous substances and wastes. , For instance, the vacuolar sequestration of excess toxic metals (e.g., Cd, Pb, Cu, As, Ni, or Fe) greatly enhances plant tolerance to harmful metals. − Phase III is also critical for the sequestration of organic contaminant conjugates in plants . However, the mechanism of Phase III metabolism in plants is not well understood due to challenges in monitoring the exact locations of conjugates at the cellular level.…”

Section: Introductionmentioning

confidence: 99%

“…17,18 As one of the prominent sequestration organelles, the plant vacuole plays a key role in storing hazardous substances and wastes. 19,20 For instance, the vacuolar sequestration of excess toxic metals (e.g., Cd, Pb, Cu, As, Ni, or Fe) greatly enhances plant tolerance to harmful metals. 21−24 Phase III is also critical for the sequestration of organic contaminant conjugates in plants.…”

Section: ■ Introductionmentioning

confidence: 99%

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Compartmentalization and Excretion of 2,4,6-Tribromophenol Sulfation and Glycosylation Conjugates in Rice Plants

Zhang

Kong

Wei

et al. 2021

Environ. Sci. Technol.

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The most environmentally abundant bromophenol congener, 2,4,6-tribromophenol (2,4,6-TBP, 6.06 μmol/L), was exposed to rice for 5 d both in vivo (intact seedling) and in vitro (suspension cell) to systematically characterize the fate of its sulfation and glycosylation conjugates in rice. The 2,4,6-TBP was rapidly transformed to produce 6 [rice cells (3 h)] and 8 [rice seedlings (24 h)] sulfated and glycosylated conjugates. The predominant sulfation conjugate (TP408, 93.0–96.7%) and glycosylation conjugate (TP490, 77.1–90.2%) were excreted into the hydroponic solution after their formation in rice roots. However, the sulfation and glycosylation conjugates presented different translocation and compartmentalization behaviors during the subsequent Phase III metabolism. Specifically, the sulfated conjugate could be vertically transported into the leaf sheath and leaf, while the glycosylation conjugates were sequestered in cell vacuoles and walls, which resulted in exclusive compartmentalization within the rice roots. These results showed the micromechanisms of the different compartmentalization behaviors of 2,4,6-TBP conjugates in Phase III metabolism. Glycosylation and sulfation of the phenolic hydroxyl groups orchestrated by plant excretion and Phase III metabolism may reduce the accumulation of 2,4,6-TBP and its conjugates in rice plants.

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