Potassium Estimation, Uptake, and Its Role in the Physiology and Metabolism of Flowering Plants

Bhandal, Iqbal S.; Malik, C. P.

doi:10.1016/s0074-7696(08)61851-3

Cited by 154 publications

(87 citation statements)

References 279 publications

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“…The magnitude of increase in K and N accumulation have been major factors for increasing DW production and plant height because both are component of many metabolically important compounds and play important role in physiological and biological functions (Marschner 2002). More than 50 enzymes are activated by K ' which plays a vital role in salt tolerance due to its penetration into the cell sap and causing protoplasmic T1 T2 T3 T4 T5 65 DAS F Genotypes changes leading to increased water retention capacity of water stressed plants (Cram 1976;Bhandal and Malik 1988). The observed enhanced value for MDA.…”

Section: Resultsmentioning

confidence: 99%

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Siddiqui

Mohammad

Khan

2009

Journal of Plant Interactions

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Soil salinity is one of the major factors responsible for the low productivity of crop plants and has become an increasing threat for agriculture. In this context, the selection of tolerant genotype/s may be one of the remedies. Keeping this in view, the effect of NaCl (0Á120 mM) stress on shoot length (SL) plant , stomatal conductance (g s ), net photosynthetic rate (P N ), total chlorophyll (Chl) content, malondialdehyde (MDA) content, sensitivity rate index (SRI), leafnitrogen (N), potassium (K) and sodium (Na) content, leaf-K/Na ratio, nitrate reductase (NR: EC.1.6.6.1) and ATP-sulphurylase (ATP-S: EC.2.7.7.4) activities and proline (Pro) and glycinebetaine (GB) content of ten genotypes of Brassica juncea L. was studied at 55 and 65 days after sowing (DAS). NaCl treatments decreased all the above parameters, except Pro, GB, MDA, Na and SRI at both stages. Salt stress resulted in accumulation of Pro and GB, in all genotypes. The magnitude of increase in both osmolytes (Pro and GB) was higher in genotype G 8 than the other genotypes. Salt stress increased MDA and Na content while it decreased Chl, N and K content and K/Na ratio, Chl content, NR and ATP-S activities in all genotypes. But the magnitude of increase in MDA and Na content and decrease in SL plant(1 , A leaf (1 , LAI, P N , g s , Chl content and NR and ATP-S activities in genotype G 8 was more than that of other genotypes. These results suggest that the salt-tolerant genotype may have better osmotic adjustment and protection from free radicals by increasing the accumulation of Pro and GB content with overproduction of N and K and higher K/Na, NR and ATP-S activities under salinity stress.

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Section: Resultsmentioning

confidence: 99%

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Siddiqui

Mohammad

Khan

2009

Journal of Plant Interactions

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“…cannot be a substitute for K ? (Bhandal and Malik 1988;Tester and Davenport 2003). In addition, Na ?…”

Section: Introductionmentioning

confidence: 99%

Manganese-induced salt stress tolerance in rice seedlings: regulation of ion homeostasis, antioxidant defense and glyoxalase systems

Rahman

Hossain

Mahmud

et al. 2016

Physiol Mol Biol Plants

131

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Hydroponically grown 12-day-old rice (Oryza sativa L. cv. BRRI dhan47) seedlings were exposed to 150 mM NaCl alone and combined with 0.5 mM MnSO 4 . Salt stress resulted in disruption of ion homeostasis by Na ? influx and K ? efflux. Higher accumulation of Na ? and water imbalance under salinity caused osmotic stress, chlorosis, and growth inhibition. Salt-induced ionic toxicity and osmotic stress consequently resulted in oxidative stress by disrupting the antioxidant defense and glyoxalase systems through overproduction of reactive oxygen species (ROS) and methylglyoxal (MG), respectively. The saltinduced damage increased with the increasing duration of stress. However, exogenous application of manganese (Mn) helped the plants to partially recover from the inhibited growth and chlorosis by improving ionic and osmotic homeostasis through decreasing Na ? influx and increasing water status, respectively. Exogenous application of Mn increased ROS detoxification by increasing the content of the phenolic compounds, flavonoids, and ascorbate (AsA), and increasing the activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), superoxide dismutase (SOD), and catalase (CAT) in the salt-treated seedlings. Supplemental Mn also reinforced MG detoxification by increasing the activities of glyoxalase I (Gly I) and glyoxalase II (Gly II) in the salt-affected seedlings. Thus, exogenous application of Mn conferred salt-stress tolerance through the coordinated action of ion homeostasis and the antioxidant defense and glyoxalase systems in the salt-affected seedlings.

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“…Low Na + and high K + in the cytoplasm are essential for the maintenance of a number of enzymatic processes (Munns, Greenway & Kirst 1983;Bhandal & Malik 1988) and protein synthesis (Flowers & Dalmond 1992;Blaha et al . 2000); however, the cytoplasmic concentration at which Na + becomes toxic is not certain (Cheeseman 1988).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic capacity is related to the cellular and subcellular partitioning of Na⁺, K⁺ and Cl^‐ in salt‐affected barley and durum wheat

James

Munns

Caemmerer

et al. 2006

Plant Cell & Environment

183

145

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The capacity of plants to tolerate high levels of salinity depends on the ability to exclude salt from the shoot, or to tolerate high concentrations of salt in the leaf (tissue tolerance). It is widely held that a major component of tissue tolerance is the capacity to compartmentalize salt into safe storage places such as vacuoles. This mechanism would avoid toxic effects of salt on photosynthesis and other key metabolic processes. To test this, the relationship between photosynthetic capacity and the cellular and subcellular distribution of Na + , K + and Cl -was studied in salt-sensitive durum wheat (cv. Wollaroi) and salt-tolerant barley (cv. Franklin) seedlings grown in a range of salinity treatments. Photosynthetic capacity parameters ( V cmax , J max ) of saltstressed Wollaroi decreased at a lower leaf Na + concentration than in Franklin. Vacuolar concentrations of Na + , K + and Cl -in mesophyll and epidermal cells were measured using cryo-scanning electron microscopy (SEM) X-ray microanalysis. In both species, the vacuolar Na + concentration was similar in mesophyll and epidermal cells, whereas K + was at higher concentrations in the mesophyll, and Cl -higher in the epidermis. The calculated cytoplasmic Na + concentration increased to higher concentrations with increasing bulk leaf Na + concentration in Wollaroi compared to Franklin. Vacuolar K + concentration was lower in the epidermal cells of Franklin than Wollaroi, resulting in higher cytoplasmic K + concentrations and a higher K + : Na + ratio. This study indicated that the maintenance of photosynthetic capacity (and the resulting greater salt tolerance) at higher leaf Na + levels of barley compared to durum wheat was associated with the maintenance of higher K + , lower Na + and the resulting higher K + : Na + in the cytoplasm of mesophyll cells of barley.

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Potassium Estimation, Uptake, and Its Role in the Physiology and Metabolism of Flowering Plants

Cited by 154 publications

References 279 publications

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Manganese-induced salt stress tolerance in rice seedlings: regulation of ion homeostasis, antioxidant defense and glyoxalase systems

Photosynthetic capacity is related to the cellular and subcellular partitioning of Na⁺, K⁺ and Cl^‐ in salt‐affected barley and durum wheat

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Potassium Estimation, Uptake, and Its Role in the Physiology and Metabolism of Flowering Plants

Cited by 154 publications

References 279 publications

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Morphological and physio-biochemical characterization ofBrassica junceaL. Czern. & Coss. genotypes under salt stress

Manganese-induced salt stress tolerance in rice seedlings: regulation of ion homeostasis, antioxidant defense and glyoxalase systems

Photosynthetic capacity is related to the cellular and subcellular partitioning of Na+, K+ and Cl‐ in salt‐affected barley and durum wheat

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Photosynthetic capacity is related to the cellular and subcellular partitioning of Na⁺, K⁺ and Cl^‐ in salt‐affected barley and durum wheat