Boron deficiency increases putrescine levels in tobacco plants

Camacho-Cristóbal, Juan J.; Maldonado, José; González-Fontes, Agustı́n

doi:10.1016/j.jplph.2004.09.016

Cited by 45 publications

(19 citation statements)

References 33 publications

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“…Putrescine belongs to the class of aliphatic polyamines shown to be involved in both abiotic and biotic stress responses (Walters, 2003;Capell et al, 2004;Legocka and Kluk, 2005). In tobacco (Nicotiana tabacum), putrescine levels were elevated following B deficiency (Camacho-Cristobal et al, 2005) and the authors proposed a potential link between B and putrescine. This is supported by our data, which show an increase in putrescine following 1,000 mM B treatment in leaves of the sensitive cultivar and a decrease in leaves of the tolerant cultivar.…”

Section: Metabolite Profiling Of Barley In Response Tomentioning

confidence: 99%

An Investigation of Boron Toxicity in Barley Using Metabolomics

et al. 2006

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Boron (B) is an essential micronutrient that affects plant growth at either deficient or toxic concentrations in soil. The aim of this work was to investigate the adaptation of barley (Hordeum vulgare) plants to toxic B levels and to increase our understanding of B toxicity tolerance mechanisms. We used a metabolomics approach to compare metabolite profiles in root and leaf tissues of an intolerant, commercial cultivar (cv Clipper) and a B-tolerant Algerian landrace (cv Sahara). After exposure to elevated B (200 and 1,000 mM), the number and amplitude of metabolite changes in roots was greater in Clipper than in Sahara. In contrast, leaf metabolites of both cultivars only responded following 1,000 mM treatment, at which B toxicity symptoms (necrosis) were visible. In addition, metabolite levels were dramatically altered in the tips of leaves of the sensitive cultivar Clipper after growth in 1,000 mM B compared to those of Sahara. This correlates with a gradual accumulation of B from leaf base to tip in B-intolerant cultivars. Overall, there were always greater differences between tissue types (roots and leaves) than between the two cultivars. This work has provided insights into metabolic differences of two genetically distinct barley cultivars and information about how they respond metabolically to increasing B levels.Boron (B) is an essential micronutrient for vascular plants. However, when B is present at high concentrations in the soil or ground water, plant growth and reproduction can be affected by B toxicity. B toxicity has been recognized as an important problem limiting crop production in the low rainfall and on highly alkaline and saline soils in regions of Australia, West Asia, and North Africa. Because soil amelioration is impractical, the development of B-tolerant cultivars is a rational solution to the problem.B freely diffuses into the roots as boric acid [B(OH) 3 ; pK a 5 9.25] and accumulates in the cytoplasm as the borate anion [B(OH) 4 2 ] due to pH-dependent interconversion. An inability to exclude B from the roots results in high B concentrations in the tissue. B phytotoxicity manifests itself in a broad range of physiological effects, including decreased shoot and root growth, root cell division and RNA content, reduced leaf chlorophyll, lower photosynthetic rates and stomatal conductance, and reduced levels of lignin and suberin (for review, see Nable et al., 1997). Leaf symptoms of toxicity in barley (Hordeum vulgare) are characterized by interveinal chlorotic and/or necrotic patches, generally at the margins and tips of older leaves. This reflects the accumulation of B at the end of the transpiration stream (Nable et al., 1997). Following long-term exposure to high B concentrations in the soil, overall vegetative plant growth is retarded and this leads to either a reduction in or a complete lack of seed set.B is also an essential nutrient, although its role in plant growth, development, and metabolism remains to be clarified. Originally, B was thought to be essentially immobile in the ...

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Section: Metabolite Profiling Of Barley In Response Tomentioning

confidence: 99%

An Investigation of Boron Toxicity in Barley Using Metabolomics

et al. 2006

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“…Boron deficiency can cause drop in root elongation and mostly leaf nitrate contents without disturbing nitrate reduce activity or the concentrations of other micronutrients such as magnesium, calcium, phosphate or potassium (Camacho-Cristobal et al, 2005) [10]. Boron deficiency can be subdued by different agronomic techniques, for example it can be overcome by supplying it through seed priming, soil application, and foliar application at different growth stages of the crop.…”

Section: Introductionmentioning

confidence: 99%

Boosting Achene Yield and Yield Related Traits of Sunflower Hybrids through Boron Application Strategies

Khan

Anjum²,

Qardri³

et al. 2015

AJPS

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“…More recently, PAs were found to be able to modulate the cellular signal of Coffea arabica cells by differentially affecting components of the phospholipids cascade (Echevarria-Machado et al 2005) Since PA levels increased significantly upon exposure to environmental stresses, it has been postulated that they are part of a plant defense mechanism against stress conditions (Turano and Kramer 1993;Camacho-Cristobal et al 2005). This hypothesis has been recently supported by the findings in several studies in which PAs have been shown to protect plants from the detrimental effects caused by several types of stresses, e.g., osmotic (Liu et al 2004), UV-induced oxidative (Lutz et al 2005), and atrazine (Zheleva et al 1994) stresses.…”

Section: Introductionmentioning

confidence: 99%

New perspective on the mechanism of alleviating salt stress by spermidine in barley seedlings

et al. 2006

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Salt stress is considered to be a major limiting factor for plant growth and crop productivity. Salt injuries in plants are mostly due to excess Na + entry. A possible survival strategy of plants under saline environments is the effective compartmentation of excess Na + by sequestering Na + in roots and inhibiting transport of Na + from roots to shoots. Our previous study showed that exogenous application of polyamines (PAs) could attenuate salt injuries in barley plants. In order to further understand such protective roles of PAs against salt stress, the effects of spermidine (Spd) on sodium and potassium distribution in barley (Hordeum vulgare L.) seedlings under saline conditions were investigated. The results showed that exogenous application of Spd induced reductions in Na + levels in roots and shoots with comparison of NaCl-treated plants, while no significant changes in K + levels were observed. Correspondingly, the plants treated with Spd exogenously maintained high values of [K + ]/[Na + ] as compared with salt-stressed plants. Moreover, it was shown by X-ray microanalysis that K + and Na + accumulated mainly in the exodermal intercellular space and cortical cells of roots under salinity stress, and low accumulation was observed in endodermal cells and stelar parenchyma, indicating Casparian bands possibly act as ion transport barriers. Most importantly, Spd treatment further strengthened this barrier effects, leading to inhibition of Na + transport into shoots. These results suggest that, by reinforcing barrier effects of Casparian bands, exogenous Spd inhibits Na + transport from roots to shoots under conditions of high salinity which are beneficial for attenuating salt injuries in barley seedlings.

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Boron deficiency increases putrescine levels in tobacco plants

Cited by 45 publications

References 33 publications

An Investigation of Boron Toxicity in Barley Using Metabolomics

An Investigation of Boron Toxicity in Barley Using Metabolomics

Boosting Achene Yield and Yield Related Traits of Sunflower Hybrids through Boron Application Strategies

New perspective on the mechanism of alleviating salt stress by spermidine in barley seedlings

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