The Mineral Nutrition of Higher Plants.

Martin, M. H.; Marschner, H.

doi:10.2307/2260650

Cited by 42 publications

(35 citation statements)

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“…Mahmoud et al [ 54 ] showed that foliar application of an Anabaena sphaerica aqueous extract on spinach leaves was more effective in increasing plant dry weight, nutrient uptake (P and K), and protein content than soil application at equal concentrations (10 g L −1 ). Moreover, plant responses to nutrients and bioactive molecules present in the extracts are normally more rapid with foliar applications than with application as a soil amendment [ 17 , 55 ].…”

Section: Agricultural Use Of Cyanobacteria: From Biofertilizers To Biostimulantsmentioning

confidence: 99%

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Santini

Biondi

Rodolfi

et al. 2021

Plants

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Cyanobacteria can be considered a promising source for the development of new biostimulants as they are known to produce a variety of biologically active molecules that can positively affect plant growth, nutrient use efficiency, qualitative traits of the final product, and increase plant tolerance to abiotic stresses. Moreover, the cultivation of cyanobacteria in controlled and confined systems, along with their metabolic plasticity, provides the possibility to improve and standardize composition and effects on plants of derived biostimulant extracts or hydrolysates, which is one of the most critical aspects in the production of commercial biostimulants. Faced with these opportunities, research on biostimulant properties of cyanobacteria has undergone a significant growth in recent years. However, research in this field is still scarce, especially as regards the number of investigated cyanobacterial species. Future research should focus on reducing the costs of cyanobacterial biomass production and plant treatment and on identifying the molecules that mediate the biostimulant effects in order to optimize their content and stability in the final product. Furthermore, the extension of agronomic trials to a wider number of plant species, different application doses, and environmental conditions would allow the development of tailored microbial biostimulants, thus facilitating the diffusion of these products among farmers.

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Section: Agricultural Use Of Cyanobacteria: From Biofertilizers To Biostimulantsmentioning

confidence: 99%

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Santini

Biondi

Rodolfi

et al. 2021

Plants

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“…Normally, as much as 20% of total Mg is in chloroplasts, but it may increase to 50% under low light conditions or during Mg deficiency [ 3 ]. Many enzymes require the binding of Mg for activity and/or regulation [ 4 , 5 ]. Processes such as phloem loading [ 6 , 7 , 8 ], leaf senescence [ 9 ], stomata opening and ionic balance of the cell [ 10 , 11 ] are only a few of many examples that illustrate the requirement for adequate Mg homeostasis.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Signaling in Plants

Kleczkowski

Igamberdiev

2021

IJMS

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Free magnesium (Mg2+) is a signal of the adenylate (ATP+ADP+AMP) status in the cells. It results from the equilibrium of adenylate kinase (AK), which uses Mg-chelated and Mg-free adenylates as substrates in both directions of its reaction. The AK-mediated primary control of intracellular [Mg2+] is finely interwoven with the operation of membrane-bound adenylate- and Mg2+-translocators, which in a given compartment control the supply of free adenylates and Mg2+ for the AK-mediated equilibration. As a result, [Mg2+] itself varies both between and within the compartments, depending on their energetic status and environmental clues. Other key nucleotide-utilizing/producing enzymes (e.g., nucleoside diphosphate kinase) may also be involved in fine-tuning of the intracellular [Mg2+]. Changes in [Mg2+] regulate activities of myriads of Mg-utilizing/requiring enzymes, affecting metabolism under both normal and stress conditions, and impacting photosynthetic performance, respiration, phloem loading and other processes. In compartments controlled by AK equilibrium (cytosol, chloroplasts, mitochondria, nucleus), the intracellular [Mg2+] can be calculated from total adenylate contents, based on the dependence of the apparent equilibrium constant of AK on [Mg2+]. Magnesium signaling, reflecting cellular adenylate status, is likely widespread in all eukaryotic and prokaryotic organisms, due simply to the omnipresent nature of AK and to its involvement in adenylate equilibration.

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“…It plays a decisive role in the proper growth and development of crop plants [ 10 ]. It has been observed that over 70 enzymes exhibit sensitivity to K + [ 11 ]. The involvement of K + has been well investigated in the movement of leaves, opening and closing of stomata, and axial growth and tropisms [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that over 70 enzymes exhibit sensitivity to K + [ 11 ]. The involvement of K + has been well investigated in the movement of leaves, opening and closing of stomata, and axial growth and tropisms [ 11 , 12 ]. It also assists plants in maintaining charge balance across the membranes [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Exogenous Potassium (K+) Positively Regulates Na+/H+ Antiport System, Carbohydrate Metabolism, and Ascorbate–Glutathione Cycle in H2S-Dependent Manner in NaCl-Stressed Tomato Seedling Roots

Khan

Bhatla

Al-Huqail

et al. 2021

Plants

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Potassium (K+) is one of the vital macronutrients required by plants for proper growth and blossoming harvest. In addition, K+ also plays a decisive role in promoting tolerance to various stresses. Under stressful conditions, plants deploy their defense system through various signaling molecules, including hydrogen sulfide (H2S). The present investigation was carried out to unravel the role of K+ and H2S in plants under NaCl stress. The results of the study show that NaCl stress caused a reduction in K+ and an increase in Na+ content in the tomato seedling roots which coincided with a lower H+-ATPase activity and K+/Na+ ratio. However, application of 5 mM K+, in association with endogenous H2S, positively regulated the Na+/H+ antiport system that accelerated K+ influx and Na+ efflux, resulting in the maintenance of a higher K+/Na+ ratio. The role of K+ and H2S in the regulation of the Na+/H+ antiport system was validated by applying sodium orthovanadate (plasma membrane H+-ATPase inhibitor), tetraethylammonium chloride (K+ channel blocker), amiloride (Na+/H+ antiporter inhibitor), and hypotaurine (HT, H2S scavenger). Application of 5 mM K+ positively regulated the ascorbate–glutathione cycle and activity of antioxidant enzymes that resulted in a reduction in reactive oxygen species generation and associated damage. Under NaCl stress, K+ also activated carbohydrate metabolism and proline accumulation that caused improvement in osmotic tolerance and enhanced the hydration level of the stressed seedlings. However, inclusion of the H2S scavenger HT reversed the effect of K+, suggesting H2S-dependent functioning of K+ under NaCl stress. Therefore, the present findings report that K+, in association with H2S, alleviates NaCl-induced impairments by regulating the Na+/H+ antiport system, carbohydrate metabolism, and antioxidative defense system.

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The Mineral Nutrition of Higher Plants.

Cited by 42 publications

References 0 publications

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Plant Biostimulants from Cyanobacteria: An Emerging Strategy to Improve Yields and Sustainability in Agriculture

Magnesium Signaling in Plants

Exogenous Potassium (K+) Positively Regulates Na+/H+ Antiport System, Carbohydrate Metabolism, and Ascorbate–Glutathione Cycle in H2S-Dependent Manner in NaCl-Stressed Tomato Seedling Roots

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