A rice chloroplast‐localized ABC transporter ARG1 modulates cobalt and nickel homeostasis and contributes to photosynthetic capacity

Li, Haixiu; Liu, Yuan; Qin, Huihui; Lin, Xiaozeng; Tang, Ding; Wu, Zhiyuan; Luo, Wei; Shen, Yi; Dong, Fengqin; Wang, Yaling; Feng, Tingting; Wang, Lili; Li, Laiyun; Chen, Doudou; Zhang, Yi; Murray, Jeremy D.; Chao, Dai‐Yin; Chong, Kang; Cheng, Zhukuan; Meng, Zheng

doi:10.1111/nph.16708

Cited by 28 publications

(11 citation statements)

References 69 publications

(107 reference statements)

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“…Additionally, an ATP-binding cassette (ABC) transporter from Arabidopsis has also been reported to transport Co, Ni, and Pb (Morel et al, 2009 ). Co movement in leaves is also associated with Ni, and Ni and Co movement in or out of chloroplasts are through an ABC transporter in the mediation of ionic homeostasis in the chloroplast of rice (Li et al, 2020 ).…”

Section: Cobalt Coenzymes and Proteinsmentioning

confidence: 99%

“…To maintain ionic homeostasis in shoots, particularly in chloroplasts, plants develop mechanisms to mediate Co in chloroplasts. An ARG1 transporter, belonging to the ATP-binding cassette, was identified in rice (Li et al, 2020 ), which was able to modulate the levels of Co and Ni in chloroplasts to prevent excessive Co and Ni from competing with metal cofactors in chlorophyll and metal-binding proteins in photosynthesis ( Figure 2 ).…”

Section: Cobalt Improves the Growth Of Higher Plantsmentioning

confidence: 99%

“…With increasing concentrations of Co inside cells, FPN2 may not be able to effectively sequester Co into the vacuole, resulting in more Co to transport from roots to shoots. Li et al ( 2020 ) showed that Co concentrations in shoots of barley, oilseed rape ( Brassica napus ), and tomato were linearly correlated with the soil solution Co. As a result, excessive Co in shoots may initially cause oxidative stress, resulting in increased anti-oxidative enzyme activities (Tewari et al, 2002 ). As the stress progresses, Co may compete with Fe or Mg in the chloroplast by decreasing chlorophyll content (Lwalaba et al, 2017 ), which causes Fe deficiency with newly growing leaves to be yellowish in color.…”

Section: Cobalt Toxicity In Plantsmentioning

confidence: 99%

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Cobalt: An Essential Micronutrient for Plant Growth?

et al. 2021

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Cobalt is a transition metal located in the fourth row of the periodic table and is a neighbor of iron and nickel. It has been considered an essential element for prokaryotes, human beings, and other mammals, but its essentiality for plants remains obscure. In this article, we proposed that cobalt (Co) is a potentially essential micronutrient of plants. Co is essential for the growth of many lower plants, such as marine algal species including diatoms, chrysophytes, and dinoflagellates, as well as for higher plants in the family Fabaceae or Leguminosae. The essentiality to leguminous plants is attributed to its role in nitrogen (N) fixation by symbiotic microbes, primarily rhizobia. Co is an integral component of cobalamin or vitamin B12, which is required by several enzymes involved in N2 fixation. In addition to symbiosis, a group of N2 fixing bacteria known as diazotrophs is able to situate in plant tissue as endophytes or closely associated with roots of plants including economically important crops, such as barley, corn, rice, sugarcane, and wheat. Their action in N2 fixation provides crops with the macronutrient of N. Co is a component of several enzymes and proteins, participating in plant metabolism. Plants may exhibit Co deficiency if there is a severe limitation in Co supply. Conversely, Co is toxic to plants at higher concentrations. High levels of Co result in pale-colored leaves, discolored veins, and the loss of leaves and can also cause iron deficiency in plants. It is anticipated that with the advance of omics, Co as a constitute of enzymes and proteins and its specific role in plant metabolism will be exclusively revealed. The confirmation of Co as an essential micronutrient will enrich our understanding of plant mineral nutrition and improve our practice in crop production.

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Section: Cobalt Coenzymes and Proteinsmentioning

confidence: 99%

Section: Cobalt Improves the Growth Of Higher Plantsmentioning

confidence: 99%

Section: Cobalt Toxicity In Plantsmentioning

confidence: 99%

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Cobalt: An Essential Micronutrient for Plant Growth?

et al. 2021

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“…In rice, ALBINO‐REVERTIBLE GREEN 1 (OsARG1), transports Co and Ni from the chloroplast to the cytosol to maintain Co and Ni metal homeostasis in the chloroplast. This function is critical to avoid the unnecessary competition of these metals with other important transition metals for binding to chlorophyll and other factors of the photosynthetic system (Li, Liu, et al, 2020; Li, Yuan, et al, 2020; Li, Zheng, et al, 2020).…”

Section: Metal Transporters In Cell Organelles and Their Functionsmentioning

confidence: 99%

Metal transporters in organelles and their roles in heavy metal transportation and sequestration mechanisms in plants

Jogawat

Yadav

Chhaya

et al. 2021

Physiologia Plantarum

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Heavy metal toxicity is one of the major concerns for agriculture and health. Accumulation of toxic heavy metals at high concentrations in edible parts of crop plants is the primary cause of disease in humans and cattle. A dramatic increase in industrialization, urbanization, and other high anthropogenic activities has led to the accumulation of heavy metals in agricultural soil, which has consequently disrupted soil conditions and affected crop yield. By now, plants have developed several mechanisms to cope with heavy metal stress. However, not all plants are equally effective in dealing with the toxicity of high heavy metal concentrations. Plants have modified their anatomy, morphophysiology, and molecular networks to survive under changing environmental conditions. Heavy metal sequestration is one of the essential processes evolved by some plants to deal with heavy metals' toxic concentration. Some plants even have the ability to accumulate metals in high quantities in the shoots/organelles without toxic effects. For intercellular and interorganeller metal transport, plants harbor spatially distributed various transporters which mainly help in uptake, translocation, and redistribution of metals. This review discusses different heavy metal transporters in different organelles and their roles in metal sequestration and redistribution to help plants cope with heavy metal stress. A good understanding of the processes at stake helps in developing more tolerant crops without affecting their productivity.

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“…Each sample was analyzed three times. Total RNA isolation and the subsequent analyses were performed as described previously (Li et al ., 2020). The qRT‐PCR analyses were performed using specific primer sets with the TB Premix Ex Taq Mix (Takara, Kusatsu, Japan) in a L ight C ycler 96 System (Roche).…”

Section: Methodsmentioning

confidence: 99%

OsMADS14 and NF‐YB1 cooperate in the direct activation of OsAGPL2 and Waxy during starch synthesis in rice endosperm

Feng

Wang

et al. 2022

New Phytologist

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Summary Starch synthesis makes a dramatic contribution to the yield and nutritional value of cereal crops. Although several starch synthesis enzymes and related regulators have been reported, the underlying regulatory mechanisms of starch synthesis remain largely unknown. OsMADS14 is a FRUITFULL (FUL)‐like MADS‐box gene in rice (Oryza sativa). Here we show that two null mutations of OsMADS14 result in a shrunken and chalky grain phenotype. It is caused by obviously defective compound starch granules and a significantly reduced content of both total starch and amylose in the endosperm. Transcriptomic profiling analyses revealed that the loss‐of‐function of OsMADS14 leads to significantly downregulated expression of many core starch synthesis genes, including OsAGPL2 and Waxy. Both in vitro and in vivo assays demonstrate that the OsMADS14 protein directly binds to stretches of DNA with a CArG‐box consensus in the putative regulatory regions of OsAGPL2 and Waxy. Protein–protein interaction experiments also suggest that OsMADS14 interacts with nuclear factor NF‐YB1 to promote the transcription of OsAGPL2 and Waxy. Our study thus demonstrates that OsMADS14 plays an essential role in the synthesis of storage starch and provides novel insights into the underlying molecular mechanism that may be used to improve rice cultivars by molecular breeding.

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A rice chloroplast‐localized ABC transporter ARG1 modulates cobalt and nickel homeostasis and contributes to photosynthetic capacity

Cited by 28 publications

References 69 publications

Cobalt: An Essential Micronutrient for Plant Growth?

Cobalt: An Essential Micronutrient for Plant Growth?

Metal transporters in organelles and their roles in heavy metal transportation and sequestration mechanisms in plants

OsMADS14 and NF‐YB1 cooperate in the direct activation of OsAGPL2 and Waxy during starch synthesis in rice endosperm

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