scholarly journals Nitrate Protects Cucumber Plants AgainstFusarium oxysporumby Regulating Citrate Exudation

2016 ◽  
Vol 57 (9) ◽  
pp. 2001-2012 ◽  
Author(s):  
Min Wang ◽  
Yuming Sun ◽  
Zechen Gu ◽  
Ruirui Wang ◽  
Guomei Sun ◽  
...  
Keyword(s):  
Citrate Exudation

Response of representative cover crops to aluminum toxicity, phosphorus deprivation, and organic amendment

2008 ◽  
Vol 59 (1) ◽  
pp. 52 ◽  
Author(s):  
Frederico C. B. Vieira ◽  
Zhenli L. He ◽  
Patrick C. Wilson ◽  
Cimélio Bayer ◽  
Peter J. Stoffella ◽  
...  
Keyword(s):  
Plant Growth ◽  
Nutrient Solution ◽  
Cover Crops ◽  
Aluminum Toxicity ◽  
Root Exudation ◽  
Nutrition Status ◽  
Specific Response ◽  
P Deficiency ◽  
Al Stress ◽  
Citrate Exudation

This study aimed to: (1) determine the effect of P depletion and presence of Al on root and shoot growth of representative cover crops, and on their nutrient uptake; (2) characterise the composition of root exudation under P and Al stress in nutrient solution; (3) evaluate the ability of aqueous extracts of composts in reducing Al phytotoxicity. Plants of cowpea (Vigna unguiculata subsp. unguiculata), black oat (Avena strigosa), and lablab (Lablab purpureous) were cultivated in different nutrient solution compositions and concentrations for 3 weeks. It was found that Al at concentration of 20 and 200 µmol/L increased citrate exudation at least 8 and 24 times, respectively, for cowpea and 18 and 36 times, respectively, for lablab, as compared with the blank. However, no release of organic acids occurred due to P deprivation, suggesting that citrate exudation was a specific response to excess Al. No response in organic acid release was observed for black oat under the stress of P deficiency or Al toxicity. Although the presence of Al in solution did not significantly affect chlorophyll content in leaves, it decreased root and shoot weight, as well as root length, surface area, volume, and number of tips. Organic extracts alleviated aluminum toxicity, improving plant growth and ameliorating plant nutrition status. Yard waste extract was more effective in enhancing plant growth than GreenEdge extract in plants under Al stress.

scholarly journals Auxin enhances aluminium-induced citrate exudation through upregulation ofGmMATEand activation of the plasma membrane H+-ATPase in soybean roots

2016 ◽  
Vol 118 (5) ◽  
pp. 933-940 ◽  
Author(s):  
Ping Wang ◽  
Wenqian Yu ◽  
Jiarong Zhang ◽  
Zed Rengel ◽  
Jin Xu ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Soybean Roots ◽  
Citrate Exudation

scholarly journals The Physiology and Biophysics of an Aluminum Tolerance Mechanism Based on Root Citrate Exudation in Maize

2002 ◽  
Vol 129 (3) ◽  
pp. 1194-1206 ◽  
Author(s):  
Miguel A. Piñeros ◽  
Jurandir V. Magalhaes ◽  
Vera M. Carvalho Alves ◽  
Leon V. Kochian
Keyword(s):  
Aluminum Tolerance ◽  
Tolerance Mechanism ◽  
Citrate Exudation

Is there a critical level of shoot phosphorus concentration for cluster-root formation in Lupinus albus?

2008 ◽  
Vol 35 (4) ◽  
pp. 328 ◽  
Author(s):  
Haigang Li ◽  
Jianbo Shen ◽  
Fusuo Zhang ◽  
Caixian Tang ◽  
Hans Lambers
Keyword(s):  
Organic Matter ◽  
Root Formation ◽  
Critical Level ◽  
Lupinus Albus ◽  
White Lupin ◽  
Cluster Roots ◽  
Proton Release ◽  
P Concentration ◽  
Citrate Exudation ◽  
P Supply

This study examined the effects of localised phosphorus (P) supply on cluster-root formation and citrate exudation in white lupin (Lupinus albus L. cv. Kiev Mutant). White lupin plants were grown in nutrient solutions with a range of P supplies in a split-root system with one root half deprived of P and the other root supplied with 0, 2, 5, 8, 10 or 75 μm P. Plants were also grown in soil with or without organic matter added to the top layer. The proportion of cluster roots as a percentage of the total root biomass decreased similarly on both root halves with increasing P supply in the hydroponic experiments. More than 18% of the P taken up by the P-supplied root halves was incorporated into the P-deprived halves. Irrespective of the P supply or organic matter addition in the experiments, the proportion of cluster roots and the rate of citrate exudation decreased sharply with increasing P concentration in the shoots up to a critical level of 2–3 mg P g–1 dry weight. In contrast, the rate of proton release was higher in P-deprived root halves than in P-supplied ones. The formation of cluster roots is regulated by shoot P concentration with a critical level of 2–3 mg g–1. Citrate exudation is predominantly governed by shoot P status, whereas proton release strongly responds to local P supply.

scholarly journals Nitric oxide is involved in phosphorus deficiency-induced cluster-root development and citrate exudation in white lupin

2010 ◽  
Vol 187 (4) ◽  
pp. 1112-1123 ◽  
Author(s):  
B. L. Wang ◽  
X. Y. Tang ◽  
L. Y. Cheng ◽  
A. Z. Zhang ◽  
W. H. Zhang ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Root Development ◽  
Phosphorus Deficiency ◽  
White Lupin ◽  
Cluster Root ◽  
Citrate Exudation
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