Root-exuded malic acid versus chlorophyll fluorescence parameters in four plant species under different phosphorus levels

Wu, Yanyou; Zhao, Keliang

doi:10.4067/s0718-95162013005000048

Cited by 3 publications

(3 citation statements)

References 19 publications

(16 reference statements)

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“…However, the tolerance of M. alba decreased under even moderate P deficiency. Under moderate P deficiency, the amount of root-exuded organic acids in B. papyrifera increased more significantly than in M. alba (Wu and Zhao 2013), and according to Hoffland et al (1992), the bioavailability of microelements around the root of B. papyrifera could be improved as a result. Due to the increase in root-exuded acids, the Cu content in B. papyrifera was higher than that in M. alba, and the Zn content in B. papyrifera exhibited a lower rate of decrease than that in M. alba.…”

Section: Discussionmentioning

confidence: 90%

“…The results in the present study also indicate that the photosynthetic capability of B. papyrifera was relatively unaffected, whereas the photosynthetic capability of M. alba is sensitive to moderate P deficiency. Under severe P deficiency, the amount of root-exuded organic acids in M. alba increased more significantly than in B. papyrifera (Wu and Zhao 2013). Although the Cu content in M. alba exhibited a lower rate of decrease, the decrease in Zn content was significant.…”

Section: Discussionmentioning

confidence: 91%

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Photosynthetic capability and Fe, Mn, Cu, and Zn contents in two Moraceae species under different phosphorus levels

Xing

et al. 2016

Acta Geochim

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The strong adaptability of Broussonetia papyrifera (L.) Vent. to low phosphorus (P) conditions can be attributed to the large amount of root-exuded organic acids and the high efficiency of P extraction. However, microelement contents are influenced by low-P stress, and their effects on the photosynthetic capability of B. papyrifera remain unknown. In this study, we investigated the effects of low-P treatment on net photosynthetic rate (P N ); chlorophyll a fluorescence (ChlF) characteristics; and Fe, Mn, Cu, and Zn contents of B. papyrifera and Morus alba L. seedlings. Results show that B. papyrifera exhibited better photosynthetic capability under moderate P deficiency (0.125, 0.063, and 0.031 mmol/L P treatments), whereas the photosynthetic capability of M. alba decreased under moderate and severe P deficiency (0.016 and 0 mmol/L P treatments). Under moderate P deficiency, the decrease in Cu and Zn contents in B. papyrifera was lower than that in M. alba. Under severe P deficiency, a considerable decrease of photosynthetic capability in B. papyrifera and M. alba was associated with low Cu and Zn contents. The P N of the two Moraceae species exhibited a better correlation with Cu and Zn contents than with Fe or Mn content. P deficiency could not only decrease cyclic photophorylation and photosynthetic efficiency, but could also affect the stability of thylakoid membrane structure and electron transport efficiency by influencing the contents of Cu or Zn, thereby affecting photosynthesis.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 91%

Photosynthetic capability and Fe, Mn, Cu, and Zn contents in two Moraceae species under different phosphorus levels

Xing

et al. 2016

Acta Geochim

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“…It is widely known that calcium carbonate acts as an important sink for P (Topalović et al, 2006) and B (Goldberg, 1997) adsorption in calcareous soils. Low molecular organic acids in root exudates may greatly affect plant availability of nutrients in the rhizosphere, and increase their uptake rates and contents in the plants (Ström, 1997;Wu and Zhao, 2013). Increased availability of these nutrients may be related to exuded organic acids stems either the lower pH of the rhizosphere, or the chelation of microelements (such as Zn), and lowering the Ca 2+ concentration by chelation and formation of sparingly soluble salts (Marschner, 1995).…”

Section: Resultsmentioning

confidence: 99%

Effects of soil properties and fertilization on quality and biological activity of Swiss chard

Topalović¹,

Knežević²,

Trifunović³

et al. 2018

European.J.Hortic.Sci

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Swiss chard (Beta vulgaris L. var. cicla) is a leafy vegetable highly consumed in many parts of the world as a very popular ingredient of different diets. The purpose of this study was to evaluate effects of soil properties and fertilization on yield, mineral composition, total phenolics, antioxidant and biological activity of Swiss chard. The mineral composition of Swiss chard was generally affected by soil properties. The fertilization at 50% of recommended level (110 kg ha -1 N, 90 kg ha -1 P 2 O 5 and 100 kg ha -1 K 2 O per season) affected negatively yield and on the other hand affected positively antioxidant activity, while fertilization at 150% of recommended level had a contrary effect. The available K in soil affected the yield positively. Total phenolics were in negative correlation with the yield. The positive relationship of total phenolics and content of Mn in chard was noticed. The greatest efficacy in human colorectal carcinoma cell lines was obtained by Swiss chard extract from plants fertilized at 150% of recommended level.

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Plant-growth-promoting rhizobacteria Bacillus subtilis RR4 isolated from rice rhizosphere induces malic acid biosynthesis in rice roots

et al. 2018

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Malic acid (MA), one of the major organic acid exudates from roots, plays a significant role in the chemotaxis of beneficial bacteria to the plant's rhizosphere. In this study, the effect of a plant-growth-promoting rhizobacterium, Bacillus subtilis RR4, on the synthesis and exudation of MA from roots is demonstrated in rice. To test the chemotactic ability of strain RR4 towards MA, a capillary chemotaxis assay was performed, which revealed a positive response (relative chemotactic ratio of 6.15 with 10 μmol/L MA); with increasing concentrations of MA, an elevated chemotactic response was observed. Quantitative polymerase chain reaction, performed to analyze the influence of RR4 on the MA biosynthetic gene, malate synthase (OsMS), and the transporter gene, aluminium-activated malate transporter (OsALMT), demonstrated significant differential expression, with 1.8- and -0.58-fold changes, respectively, in RR4-treated roots. The gene expression pattern of OsMS corroborated the data obtained by high-performance liquid chromatography, which showed elevated MA levels in roots (1.52-fold), whereas the levels of MA in root exudates were not altered significantly although expression of OsALMT was reduced. Our results demonstrate that B. subtilis RR4 is chemotactic to MA and can induce biosynthesis of MA in rice roots.

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Root-exuded malic acid versus chlorophyll fluorescence parameters in four plant species under different phosphorus levels

Cited by 3 publications

References 19 publications

Photosynthetic capability and Fe, Mn, Cu, and Zn contents in two Moraceae species under different phosphorus levels

Photosynthetic capability and Fe, Mn, Cu, and Zn contents in two Moraceae species under different phosphorus levels

Effects of soil properties and fertilization on quality and biological activity of Swiss chard

Plant-growth-promoting rhizobacteria Bacillus subtilis RR4 isolated from rice rhizosphere induces malic acid biosynthesis in rice roots

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