Boron transport mechanisms: collaboration of channels and transporters

Takano, Junpei; Miwa, Kyoko; Fujiwara, Toru

doi:10.1016/j.tplants.2008.05.007

Cited by 237 publications

(178 citation statements)

References 68 publications

Supporting

Mentioning

163

Contrasting

Unclassified

Order By: Relevance

“…After being loaded into the xylem, B is transported through the vascular system to the shoots by the transpiration stream (Brown et al 1998), resulting in a high accumulation of B in the mature leaves which had the highest transpiration levels. However, the mobility of B is drastically divergent in diff erent plant species (Takano et al 2008). In this experiment, the lower leaves of laurustinus accumulated much more B than those of metrosideros, the highest levels being observed in the non-salinated plants exposed to excess B (Table 3).…”

Section: Concentrations Of Boron Sodium and Chloride In The Plantsmentioning

confidence: 73%

The effect of salinity and high boron on growth, photosynthetic activity and mineral contents of two ornamental shrubs

Bañón¹,

Miralles²,

Ochoa³

et al. 2012

Hortic. Sci.

View full text Add to dashboard Cite

Bañón S., Miralles J., Ochoa J., Sánchez-Blanco M.J., 2012. Th e eff ect of salinity and high boron on growth, photosynthetic activity and mineral contents of two ornamental shrubs. Hort. Sci. (Prague) 39: 188-194.Simultaneous salinity and boron (B) excess often occur due to irrigation with water containing high levels of salts, including B. Th e eff ects of excess of NaCl and B in the nutrient solution on some agronomical and physiological parameters of Viburnum tinus (laurustinus) and Metrosideros excelsa (metrosideros) were studied. Potted plants were grown in a factorial combination of B (1 and 6 mg/l) and NaCl (2 and 6 dS/m). B toxicity (6 mg/l) caused tip/edge burn in the lower leaves of laurustinus, while these symptoms were absent in metrosideros. Toxicity by B reduced dry biomass in the two species, particularly the aerial part in metrosideros and the roots in laurustinus. Metrosideros accumulated a similar content of B in all leaves, while the laurustinus tended to accumulate more B in the lower leaves. Th e leaf B content in laurustinus was reduced by salinity to a greater extent than in metrosideros; however, this was not suffi cient to prevent injuries to the laurustinus photosynthetic system.

show abstract

Section: Concentrations Of Boron Sodium and Chloride In The Plantsmentioning

confidence: 73%

The effect of salinity and high boron on growth, photosynthetic activity and mineral contents of two ornamental shrubs

Bañón¹,

Miralles²,

Ochoa³

et al. 2012

Hortic. Sci.

View full text Add to dashboard Cite

show abstract

“…11). B uptake by plants occurs as the undissociated boric acid via members of the aquaporintype family of transporters (Sutton et al, 2007;Takano et al, 2008;Miwa and Fujiwara, 2010). OsNIP3;1 is a candidate for B uptake in rice because it is expressed mainly in the exodermis and vascular tissues of roots and leaves, and transcript levels increase during B starvation (Hanaoka et al, 2014).…”

Section: B Nutrition Is Disrupted In the Ox Linesmentioning

confidence: 99%

Altered Expression of a Malate-Permeable Anion Channel, OsALMT4, Disrupts Mineral Nutrition

et al. 2017

View full text Add to dashboard Cite

ORCID IDs: 0000-0003-1555-4754 (J.L.); 0000-0003-3009-7854 (M.Z.); 0000-0002-1376-9543 (P.R.R.).Aluminum-activated malate transporters (ALMTs) form a family of anion channels in plants, but little is known about most of its members. This study examined the function of OsALMT4 from rice (Oryza sativa). We show that OsALMT4 is expressed in roots and shoots and that the OsALMT4 protein localizes to the plasma membrane. Transgenic rice lines overexpressing (OX) OsALMT4 released malate from the roots constitutively and had 2-fold higher malate concentrations in the xylem sap than nulls, indicating greater concentrations of malate in the apoplast. OX lines developed brown necrotic spots on the leaves that did not appear on nulls. These symptoms were not associated with altered concentrations of any mineral element in the leaves, although the OX lines had higher concentrations of Mn and B in their grain compared with nulls. While total leaf Mn concentrations were not different between the OX and null lines, Mn concentrations in the apoplast were greater in the OX plants. The OX lines also displayed increased expression of Mn transporters and were more sensitive to Mn toxicity than null plants. We showed that the growth of wild-type rice was unaffected by 100 mM Mn in hydroponics but, when combined with 1 mM malate, this concentration inhibited growth. We conclude that increasing OsALMT4 expression affected malate efflux and compartmentation within the tissues, which increased Mn concentrations in the apoplast of leaves and induced the toxicity symptoms. This study reveals new links between malate transport and mineral nutrition.

show abstract

“…Thus, boron is important for architecture and stability of plant cell walls (Bolaños et al 2004;Matthes and Torres-Ruiz 2017). Other research milestones included the identification of a boric acid channel, NIP5;1, and a boric acid/borate exporter, BOR1, from Arabidopsis thaliana (Takano et al 2008). There is increasing evidence that the boron transporters are generally important for plant development, for instance in roots and shoot nodes and for the development of inflorescence tissues (Zhang et al 2017).…”

Section: Role Of Boron Compounds In Plantsmentioning

confidence: 99%