Studies on potassium nutrition of plants. II.—Some effects of potassium deficiency on the organic acids of leaves

1967 ◽  
Vol 18 (12) ◽  
pp. 569-576 ◽  
Author(s):  
G. G. Freeman
Keyword(s):  
Organic Acids ◽  
Potassium Deficiency ◽  
Potassium Nutrition

Solubilization of potassium-bearing minerals by a wild-type strain of Bacillus edaphicus and its mutants and increased potassium uptake by wheat

2006 ◽  
Vol 52 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Xia Fang Sheng ◽  
Lin Yan He
Keyword(s):  
Organic Acids ◽  
Type Strain ◽  
Wild Type Strain ◽  
Capsular Polysaccharide ◽  
Active Agent ◽  
Triticum Aestivum L ◽  
Wild Type ◽  
Bacterial Strains ◽  
Potassium Nutrition ◽  
Tartaric Acids

Two potassium (K)-bearing minerals, Nanjing feldspar and Suzhou illite, were used to investigate K mobilization by the wild-type strain NBT of Bacillus edaphicus, also labeled MPs+, selected for high activity in mobilizing potassium from minerals, and by four of its UV + LiCl mutants, MPs++, MPs+1, MPs+2, and MPs–. In liquid cultures, the five bacterial strains showed better growth on Suzhou illite than on Nanjing feldspar. Suzhou illite was the better potassium source for the growth of the wild type and the MPs++, MPs+1, and MPs+2 mutants. Solubilization of K from its sources by the wild-type NBT and the MPs++ mutant resulted mostly from the action of organic acids and capsular polysaccharides. Oxalic acid seemed to be a more active agent for the solubilization of Nanjing feldspar. Oxalic and tartaric acids were likely involved in the solubilization of Suzhou illite. The MPs– mutant did not produce any organic acid or capsular polysaccharide when grown on the above two K sources. In a pot experiment, wheat (Triticum aestivum L.) 'Yangmai-158' was grown in a yellow–brown soil that had low available K. After inoculation with bacterial strains, B. edaphicus NBT and its four mutants, MPs++, MPs+1, MPs+2, and MPs– (in separate tests), the root growth and shoot growth of wheat were significantly increased by B. edaphicus NBT and the mutants MPs++ and MPs+1. Bacterial inoculation also resulted in significantly higher N, P, and K contents of plant components. The bacteria were able to survive in the wheat rhizosphere soils after root inoculation.Key words: Bacillus edaphicus, potassium release, organic acids, potassium nutrition.

scholarly journals Rapid Identification of Potassium Nutrition Stress in Rice Based on Machine Vision and Object-Oriented Segmentation

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Lisu Chen ◽  
Shihan Huang ◽  
Yuanyuan Sun ◽  
Enyan Zhu ◽  
Ke Wang
Keyword(s):  
Machine Vision ◽  
Spectral Characteristics ◽  
Object Oriented ◽  
Potassium Deficiency ◽  
Identification Accuracy ◽  
Effective Characteristics ◽  
Support Vector ◽  
Leaf Margin ◽  
Potassium Nutrition ◽  
Necrotic Spots

Special symptoms could be observed on rice leaves when exposed to potassium deficiency, and these symptoms usually display differently under different potassium levels, which offer a foundation for rapid nutrition diagnosis. In this research study, two years of hydroponic experiments on rice (providing 5 levels of potassium nutrition from extremely short to normal) were carried out and the leaf images were acquired by optical scanning at four growth periods. To diagnose the potassium nutrition content, the special symptoms including the yellowish brown leaf margin and the necrotic spots were segmented and quantized by the object-oriented method from leaf images, and the 6 further spectral characteristics of leaf were extracted by the image color analyzing function of MATLAB software. Based on the relationship between potassium content and leaf characteristics, the G value (average value of G channel in the RGB color model) calculated from the entire leaf and leaf tip, the area of yellowish leaf margin, and the number of necrotic spots were applied in the establishment of the identification model of potassium stress by using the support vector machine (SVM). The results indicated that the overall identification accuracies of rice potassium nutrition contents were 90%, 94%, 94%, and 96% at four different growth periods (productive tillering stage, invalid tillering stage, jointing stage, and booting stage), respectively. The data obtained from another year were used to validate the model, and the identification accuracies were 94%, 78%, 80%, and 84%, respectively. Generally speaking, the extraction of the specific symptoms by using object-oriented segmentation is an extension of machine vision technology in diagnosing potassium deficiency, and its application in diagnosing plant nutrition is valuable for the quantization of effective characteristics and improvement of identification accuracy.

scholarly journals Potassium nutrition recover impacts on stomatal, mesophyll and biochemical limitations to photosynthesis in Carya cathayensis and Hickory illinoensis

2018 ◽  
Author(s):  
Chao Shen ◽  
Ruimin Huang ◽  
Yiquan Tang ◽  
Zhengjia Wang
Keyword(s):  
Photosynthetic Capacity ◽  
Dry Weight ◽  
Potassium Deficiency ◽  
Plant Leaves ◽  
Carya Illinoensis ◽  
Potassium Nutrition ◽  
Carya Cathayensis ◽  
Regulation Of Photosynthesis

AbstractPotassium (K) influences the photosynthesis process in a number of ways; However, the mechanism of photosynthetic response to the long-term supply of potassium is not yet clear. Concurrent measurements of gas exchange and chlorophyll fluorescence were made to investigate the effect of potassium nutrition on photosynthetic efficiency and stomatal conductance (gs), mesophyll conductance (gm) in Pecan (Carya illinoensis K.Kock) and Hickory (Carya cathayensis Sarg.) seedlings in a greenhouse. The results show that the photosynthetic capacity of Pecan and Hickory plants was not limited when the leaves had potassium concentrations >1.4% and 1.42% of dry weight. Most of limitation under potassium deficiency were dominated by MCL for Pecan and Hickory. Both cultivars showed remarkable improvement in SL, MCL, J and Vc,max with additional K supplies. However, effect from potassium deficiency on photosynthesis in plant leaves was irreversible. All of SL, MCL, and BL nearly half down with recovery K supply in both species. These results emphasize the important role of potassium on regulation of photosynthesis by three limitations.

Novel Approach of Use of Organic Acids and Salts as a Potent Alternative to Antibiotics

2011 ◽  
Vol 3 (5) ◽  
pp. 45-47
Author(s):  
P. G. Umbarkar P. G. Umbarkar ◽  
◽  
Swati. N Zodpe
Keyword(s):  
Organic Acids ◽  
Novel Approach

ORGANIC ACIDS, SUGARS, PHENOLIC COMPOUNDS AND ANTIOXIDANT ACTIVITY OF Malus floribunda coccinella FRUIT, PEEL AND FLESH

2018 ◽  
Vol 17 (5) ◽  
pp. 47-59
Author(s):  
Hacer Coklar ◽  
Mehmet Akbulut ◽  
Iliasu Alhassan ◽  
Şeyma Kirpitci ◽  
Emine Korkmaz
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Organic Acids ◽  
Fruit Peel ◽  
Malus Floribunda

IN SITU SOIL FLUSHING - STUDIES ON REMEDIATION EFFICIENCY OF POLLUTED SANDY SOILS WITH ORGANIC ACIDS

2012 ◽  
Vol 11 (12) ◽  
pp. 2163-2168
Author(s):  
Alexandra-Dana Chitimus ◽  
Valentin Nedeff ◽  
Emilian Florin Mosnegutu ◽  
Mirela Panainte
Keyword(s):  
Organic Acids ◽  
Sandy Soils ◽  
Soil Flushing ◽  
Remediation Efficiency
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