Compartmentation of boron in roots and leaves of sunflower as affected by boron supply

Dannel, Frank; Pfeffer, H.; Römheld, Volker

doi:10.1016/s0176-1617(98)80212-5

Cited by 74 publications

(57 citation statements)

References 17 publications

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“…The leaves did not show any visible symptoms of B deficiency, except for the second and third leaves of B0 plants, which appeared crinkled. Similar growth reductions and symptoms suffered from B deficiency were reported for sunflower plant by Dannel et al 11 At harvest, the B concentration in the growth media decreased from the original level to 0.0 μM B for B0.5 and B1 plants, to 0.4 μM B for B2.5 plants, and to 2.6 μM B for B5 plants, probably due to active B uptake, 1,22 indicating that the B0.5 and B1 plants as well as B0 plants were cultured under B deprived conditions.…”

Section: Resultssupporting

confidence: 85%

“…8,11 Waterinsoluble B has been revealed to exist in cell walls as a dimeric rhamnogalacturonan II-borate (dRG-II-B) complex, in which a borate-apiose (1:2) ester cross-links two monomeric RG-IIs. [12][13][14][15][16] The pectic polysaccharide RG-II is covalently bound to homogalacturonan, which is a major component of pectin.…”

mentioning

confidence: 99%

“…1,2 It has been demonstrated that the water-soluble B in plants is present as boric acid, and as a borate ester with low-molecular-weight diol compounds (1:1 and 1:2), 9,10 and that the amount of watersoluble B decreases with a decrease in the B supply. 8,11 Waterinsoluble B has been revealed to exist in cell walls as a dimeric rhamnogalacturonan II-borate (dRG-II-B) complex, in which a borate-apiose (1:2) ester cross-links two monomeric RG-IIs. [12][13][14][15][16] The pectic polysaccharide RG-II is covalently bound to homogalacturonan, which is a major component of pectin.…”

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Borate Cross-Linked/Total Rhamnogalacturonan II Ratio in Cell Walls for the Biochemical Diagnosis of Boron Deficiency in Hydroponically Grown Pumpkin

Matsunaga

Ishii

2006

ANAL. SCI.

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Boron (B) is an essential trace element for vascular plants, 1,2 and B deficiency inhibits the growth of root and shoot tips. 3 The B deficiency in field crops has been reported for various species and in many countries. 4 B deficiency is diagnosed by plant symptoms and by soil and plant analysis for good crop management. 5In plant analysis for mineral nutrition diagnosis, 6,7 the total mineral content of leaves is frequently determined to compare with the critical content. Based on the role and behavior of minerals in plants, the fractionated analysis of active forms (e.g., water-soluble) and biochemical analysis of metal species related to the metal function (e.g., metalloenzyme) has also been proposed. Water-soluble B is reported to be possible to diagnose the B nutritional status in plants. 8 However, a biochemical diagnosis method for B has not yet been developed because the function of B in plants at the molecular level has not been well resolved until recent years.In the last decade, much progress has been made in studying the chemical form and function of B in plants (Fig. 1).1,2 It has been demonstrated that the water-soluble B in plants is present as boric acid, and as a borate ester with low-molecular-weight diol compounds (1:1 and 1:2), 9,10 and that the amount of watersoluble B decreases with a decrease in the B supply. 8,11 Waterinsoluble B has been revealed to exist in cell walls as a dimeric rhamnogalacturonan II-borate (dRG-II-B) complex, in which a borate-apiose (1:2) ester cross-links two monomeric RG-IIs. [12][13][14][15][16] The pectic polysaccharide RG-II is covalently bound to homogalacturonan, which is a major component of pectin. 17The borate cross-linked RG-II or dRG-II-B/total RG-II ratio in cell walls of B-sufficient and deficient plants is reported to be 0.8 -0.9 and 0 -0.2, respectively. 18,19 These studies have established that the major function of B in plants is to covalently cross-link RG-II by a borate ester, and thereby to form a pectic network. Such cross-linked pectin macromolecules contribute to the strength and integrity of cell walls. [18][19][20] Considering this B function, it is expected that the dRG-II-B to total RG-II ratio in cell walls would be a useful biochemical index to diagnose B deficiency in plants. Thus, in the present study, we analyzed the dRG-II-B to total RG-II ratio as well as the water-soluble B content of tissues of pumpkin hydroponically grown under various low-B conditions to evaluate their applicability to the diagnosis of plant B deficiency. Materials and Methods Plant material and growth conditionsPumpkin seeds (Cucurbita maxima Duchesne cv. TokyoKabocha, Sakata Seed Co., Yokohama, Japan) were sown in washed rock-wool 66R (Nitto Boseki Co., Tokyo, Japan) and grown in a growth chamber Research Center, National Agriculture and Food Research Organization, Tsukuba, Japan **Forestry and Forest Products Research Institute, Tsukuba, Japan Boron (B) is an essential micronutrient for vascular plants. The function of B has been demonstrated to cro...

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Section: Resultssupporting

confidence: 85%

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confidence: 99%

mentioning

confidence: 99%

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Borate Cross-Linked/Total Rhamnogalacturonan II Ratio in Cell Walls for the Biochemical Diagnosis of Boron Deficiency in Hydroponically Grown Pumpkin

Matsunaga

Ishii

2006

ANAL. SCI.

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“…Recently, the active transport of B was reported in sunflower (Helianthus annuus) (Dannel et al, 1998). Soon thereafter, the Arabidopsis gene At BOR1 was identified as the first B transporter in a living system (Takano et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Cell-Type Specificity of the Expression of Os BOR1, a Rice Efflux Boron Transporter Gene, Is Regulated in Response to Boron Availability for Efficient Boron Uptake and Xylem Loading

et al. 2007

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We describe a boron (B) transporter, Os BOR1, in rice (Oryza sativa). Os BOR1 is a plasma membrane-localized efflux transporter of B and is required for normal growth of rice plants under conditions of limited B supply (referred to as -B). Disruption of Os BOR1 reduced B uptake and xylem loading of B. The accumulation of Os BOR1 transcripts was higher in roots than that in shoots and was not affected by B deprivation; however, Os BOR1 was detected in the roots of wild-type plants under -B conditions, but not under normal conditions, suggesting regulation of protein accumulation in response to B nutrition. Interestingly, tissue specificity of Os BOR1 expression is affected by B treatment. Transgenic rice plants containing an Os BOR1 promoter-b-glucuronidase (GUS) fusion construct grown with a normal B supply showed the strongest GUS activity in the steles, whereas after 3 d of -B treatment, GUS activity was elevated in the exodermis. After 6 d of -B treatment, GUS activity was again strong in the stele. Our results demonstrate that Os BOR1 is required both for efficient B uptake and for xylem loading of B. Possible roles of the temporal changes in tissue-specific patterns of Os BOR1 expression in response to B condition are discussed.

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“…A deficiência de B reduz a permeabilidade da membrana plasmática e o fluxo de água, afetando a absorção dos nutrientes. A redução da condutância hidráulica do xilema pode estar associada à menor transpiração, absorção de B e crescimento de plantas deficientes sob deficiência de B (NABLE et al, 1997;DANNEL et al, 1998). O papel estrutural do B e aqueles associados às funções de divisão, diferenciação e alongamento celular devem estar associados com a alteração do potencial hidráulico da planta (NABLE et al, 1997;DANNEL et al, 1998).…”

Section: Introductionunclassified

Características fisiológicas e crescimento de clones de eucalipto em resposta ao boro

Mattiello¹,

Ruíz

Silva

et al. 2009

Rev. Árvore

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RESUMO -A exigência para boro (B) varia largamente entre e dentro das espécies vegetais. Objetivando avaliar a resposta de clones de eucalipto ao B em solução nutritiva foi realizado ensaio em casa de vegetação com oito clones. As plantas cresceram em soluções nutritivas com 0, 10, 20, 50 e 100 µmol/L de B, durante 70 dias. Na finalização do ensaio determinaram-se características fisiológicas, produção de matéria seca e teores de B no tecido vegetal. Houve resposta diferenciada dos clones à concentração de B na solução nutritiva, com máxima produção de matéria seca entre 28 e 69 µmol/L de B. Em baixas concentrações de B, pôde-se observar sintomas visuais de deficiência e, em altas concentrações, não foram observados sintomas de toxidez, porém houve redução na produção de matéria seca. A resposta do eucalipto ao B na solução nutritiva depende do clone, havendo diferenças entre eles na tolerância à deficiência e toxidez e na eficiência PHYSIOLOGICAL CHARACTERISTICS AND DRY MATTER PRODUCTION OF EUCALYPTUS IN RESPONSE TO BORON ABSTRACT -Boron (B) requirement for plant growth varies both within and among plant species. In order to evaluate the response of clones of eucalyptus to B in nutrient solution

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Compartmentation of boron in roots and leaves of sunflower as affected by boron supply

Cited by 74 publications

References 17 publications

Borate Cross-Linked/Total Rhamnogalacturonan II Ratio in Cell Walls for the Biochemical Diagnosis of Boron Deficiency in Hydroponically Grown Pumpkin

Borate Cross-Linked/Total Rhamnogalacturonan II Ratio in Cell Walls for the Biochemical Diagnosis of Boron Deficiency in Hydroponically Grown Pumpkin

Cell-Type Specificity of the Expression of Os BOR1, a Rice Efflux Boron Transporter Gene, Is Regulated in Response to Boron Availability for Efficient Boron Uptake and Xylem Loading

Características fisiológicas e crescimento de clones de eucalipto em resposta ao boro

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