Role of Mineral Elements with Emphasis on the Univalent Cations

Evans, and H J; Sorger, G J

doi:10.1146/annurev.pp.17.060166.000403

Cited by 493 publications

(216 citation statements)

References 45 publications

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“…As shown in Figure 7, A and B, after 3 d of the imposed stress, the first trifoliolate leaf of K-deficient plants had higher concentrations of sucrose and hexose sugars relative to control plants. Accumulation of soluble sugars is often observed in K-deficient plants (6). The accumulation of hexose sugars in K-deficient leaves was temporally correlated with increased activities of acid invertase relative to control plants (Fig.…”

Section: Resultsmentioning

confidence: 82%

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Biochemical Basis for Effects of K-Deficiency on Assimilate Export Rate and Accumulation of Soluble Sugars in Soybean Leaves

Huber

1984

Plant Physiol.

105

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Section: Resultsmentioning

confidence: 82%

“…The increase in hexose concentration that is generally observed in K-deficient leaves has been traditionally attributed to decreased in vivo activities of K+-dependent enzymes, such as pyruvate kinase (6). It is also possible that hexose concentrations are elevated because of greater hydrolysis of sucrose in deficient tissues (23).…”

mentioning

confidence: 99%

Biochemical Basis for Effects of K-Deficiency on Assimilate Export Rate and Accumulation of Soluble Sugars in Soybean Leaves

Huber

1984

Plant Physiol.

105

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“…O K é um elemento vital na nutrição inorgânica, pois participa de vários processos bioquímicos e fisiológicos nas plantas, como: ativador de várias enzimas (Evans & Sorger, 1986), status de água da planta e na expansão celular (Mengel & Arneke, 1982), controle estomático (Rascke, 1975), processo fotossintético (Demmig & Gimmler, 1983) e carregamento e transporte de fotoassimilados no floema (Mengel & Haeder, 1977).…”

Section: Introductionunclassified

Reserva mineral de potássio em Latossolo cultivado com Pinus taeda L.

Alves

Melo²,

Reissmann³

et al. 2013

Rev. Bras. Ciênc. Solo

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RESUMONo Brasil, aproximadamente 1,87 milhões de hectares são plantados com as espécies de Pinus, normalmente em solos pobres quimicamente. Os objetivos deste trabalho foram estudar a mineralogia das frações areia, silte e argila e estimar a reserva mineral de K por diferentes métodos de extrações químicas em solo naturalmente pobre nesse nutriente e cultivado com Pinus taeda L., no Segundo Planalto Paranaense. Foram selecionadas cinco árvores com maior diâmetro (árvores dominantes), em uma área de 500 m 2 , para abertura de uma trincheira (1,6 m) na projeção da copa de cada árvore. Todos os perfis foram classificados como Latossolo Vermelho-Amarelo distrófico típico e apresentaram similaridade na morfologia e na sequência dos horizontes, cujas profundidades médias foram: O = 0,04 m, A1 = 0-0,09 m, A2 = 0,09-0,24 m, BA = 0,24-0,43 m, B1 = 0,43-0,66 m e B2 = 0,66-1,60 + m. As amostras coletadas em cada horizonte foram submetidas a análises físicas (granulometria) e químicas (pH, carbono orgânico, acidez potencial, Al 3+ e bases trocáveis, P disponível, K total e não trocável), e as frações areia, silte e argila foram estudadas por difratometria de raios-X (DRX). As frações areia e silte dos solos apresentaram mineralogia bastante uniforme, com predomínio absoluto de quartzo e apenas ocorrência de discretas reflexões de mica por DRX. A fração argila também apresentou limitada ocorrência de minerais micáceos. Os tratamentos sequenciais para remoção de óxidos de Fe, gibbsita e caulinita foram eficientes para concentração de mica na fração argila, o que facilitou a identificação de biotita e muscovita por DRX. Os baixos teores de K não trocável obtidos com diferentes concentrações de HNO 3 fervente (máximo de 91 mg kg -1 ) e de K total extraído com HF concentrado (máximo de 202,7 mg kg -1 ) foram consistentes com a pobreza das frações do solo em minerais primários, fontes desse nutriente. As correlações positivas e significativas entre os teores não trocáveis de K no solo e os teores e conteúdos do nutriente nas árvores indicaram a importância de formas de reservas do nutriente na nutrição da espécie em solos altamente intemperizados e pobres em K trocável.Termos de indexação: mica, extração nítrica, K não trocável, K total.(1) Recebido para publicação em 20 de setembro de 2012 e aprovado em 22 de julho de 2013.

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“…In this case the role of the useless elements would show itself more than anytime because the limit between the sufficiency and lack of the nutritious elements are so close to each other and the small reduction in their absorption would lead to the lack of these elements and it would cause the reduction in the functioning. Sulphur would increase the resistance of plants in front of environmental stress [2,3] But the amount of it in the plants in the drought stress would decrease very much as its lacking is obvious in the weather organs [10] . With the research that the researcher performed in the condition of humidity stress on Sulphur in Rapeseed (Brassica napus), they reached to this conclusion that the harsh reduction of sulphur in the Rapeseed (Brassica napus)'s organs would reduce the production of chlorophyll and photosynthesis reduction and the producing the dry substance would reduce and also the indicator of the harvesting would be reduce too [4] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Micro and Macro Elements in Drought Stress Condition in Cultivars of Rapeseed (Brassica napus L.)

Nasri¹,

Khalatbari²,

Zahedi³

et al. 2008

American J. of Agricultural and Biological Sciences

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For study the effects of different levels of irrigating according to the 0, 25, 50 and 75% of field capacity to the amount of food less demand's elements in the number of 5 and Rapeseed (Brassica napus) line this experiment randomized complete block design had been executed in the field at 2002-2003 in the research field of agricultural university of Varamin, Azad University. The amount of the needed fertilizer had consumed according to the soil analysis of the test site. At the end of the research for determining the amount of each element in each caring, the leaf samples had transferred to the laboratory and the necessary examination had been performed. The result had been Variance analyzed with the help SAS software and the comparison of the data average had executed with the help of the multi amplitude test of Duncan. According to the results of Variance analysis, the difference of elements in the numbers and different lines of Rapeseed (Brassica napus) and the different levels of irrigating and the counter effect of these two factors had been meaningful in the level of 1% and among the numbers only the element of Sulphur had the statistical meaningful difference. The variety of Hyola-42 and Mohican had allocated the first and the last statistical class to itself orderly with the average of 1.94 and 1.03%. The varieties were not meaningful in the case of the amount percentage of boron and Zn in the dry substance of leaf. Also in this study the different levels of irrigation has been meaningful effects on the amount of percentage of the elements 3. With increasing of the intensity of drought stress from 75-0% the F.C amount of element have shown the decreasing amount and Sulphur had reached from 1.98-1.01% and the Zinc had reached to the 15.2 mg from 29.6% in the dry substance of the leaf. However the amount of the results had shown the reduction but they were meaningless in the case of statistic.

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Role of Mineral Elements with Emphasis on the Univalent Cations

Cited by 493 publications

References 45 publications

Biochemical Basis for Effects of K-Deficiency on Assimilate Export Rate and Accumulation of Soluble Sugars in Soybean Leaves

Biochemical Basis for Effects of K-Deficiency on Assimilate Export Rate and Accumulation of Soluble Sugars in Soybean Leaves

Reserva mineral de potássio em Latossolo cultivado com Pinus taeda L.

Evaluation of Micro and Macro Elements in Drought Stress Condition in Cultivars of Rapeseed (Brassica napus L.)

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