scholarly journals Influence of Water Deficit on Iron and Zinc Uptake by Matricaria chamomilla L.

2012 ◽  
Vol 72 (2) ◽  
pp. 232-236 ◽  
Author(s):  
Alireza Pirzad ◽  
Reza Darvishzadeh ◽  
Iraj Bernousi ◽  
Abbas Hassani ◽  
Nuray Sivritepe
2020 ◽  
Vol 19 (1) ◽  
pp. 21-39
Author(s):  
Marta Rokosa ◽  
Małgorzata Mikiciuk

The genus Fragaria belongs to the Rosaceae family. The most popular representatives of this species are the strawberry (Fragaria × ananassa Duch.) and wild strawberry (Fragaria vesca L.), whose taste and health benefits are appreciated by a huge number of consumers. The cultivation of Fragaria plants is widespread around the world, with particular emphasis on the temperate climate zone. Increasingly occurring weather anomalies, including drought phenomena, cause immense losses in crop cultivation. The Fragaria plant species are very sensitive to drought, due to the shallow root system, large leaf area and the high water content of the fruit. There have been many studies on the influence of water deficit on the morphological, biochemical and physiological features of strawberries and wild strawberries. There is a lack of research summarizing the current state of knowledge regarding of specific species response to water stress. The aim of this study was to combine and compare data from many research carried out and indicate the direction of future research aimed at improving the resistance of Fragaria plants species to stress related to drought. These plants show patterns of response to stress caused by drought, such as: osmotic adjustment, reduction of transpiration and photosynthesis, and increased efficiency of water use. Drought also causes significant changes in the composition and palatability of the fruit of the Fragaria plant species.


1978 ◽  
Vol 56 (3) ◽  
pp. 384-389 ◽  
Author(s):  
D. L. Hamilton ◽  
J. E. C. Bellamy ◽  
J. D. Valberg ◽  
L. S. Valberg

Zinc absorption from a test dose of (65Zn) zinc chloride was increased in mice with a high capacity to absorb iron induced by a low-iron diet. When radiolabelled zinc chloride in concentrations varying from 0.025 to 0.30 mM was perfused through open-ended duodenal loops of mice fed this diet, the proportion of zinc taken up from the lumen and transferred to the body was greater from lower than from higher doses. The addition of iron to the perfusate inhibited zinc uptake and transfer, and zinc had a similar effect on iron absorption. Cadmium, a potent inhibitor of iron uptake in mice fed a low-iron diet, impaired zinc uptake under these dietary conditions. These results suggest that in dietary-induced iron deficiency there are analogous mucosal binding sites for the uptake of iron and zinc. There also appear to be mutually exclusive binding sites for the absorption of these metals: radiolabeled iron absorption from an intragastric test dose was enhanced in mice with a high capacity to absorb iron produced by bleeding, whereas the absorption of zinc was not increased.


2009 ◽  
Vol 191 (20) ◽  
pp. 6340-6344 ◽  
Author(s):  
Agnese Serafini ◽  
Francesca Boldrin ◽  
Giorgio Palù ◽  
Riccardo Manganelli

ABSTRACT Recently, a novel type of secretory pathway, type VII secretion systems (T7SSs), has been characterized in mycobacteria. The chromosomes of Mycobacterium tuberculosis and Mycobacterium bovis encode five T7SSs (ESX-1 to ESX-5). The best characterized of them, ESX-1, is involved in host-pathogen interactions, and its deletion is one of the main causes of M. bovis BCG attenuation. Another T7SS, ESX-3, has been previously shown to be transcriptionally controlled by the zinc uptake repressor (Zur) and by the iron-dependent transcriptional repressor (IdeR), suggesting that it might be involved in zinc and iron homeostasis. In this study, we characterized an M. tuberculosis conditional mutant in which transcription of the ESX-3 gene cluster can be downregulated by anhydrotetracycline. We showed that this T7SS is essential for growth and that this phenotype can be complemented by zinc, iron, or supernatant from a wild-type parental strain culture, demonstrating that the ESX-3 secretion system is responsible for the secretion of some soluble factor(s) required for growth that is probably involved in optimal iron and zinc uptake.


Plant Science ◽  
2005 ◽  
Vol 169 (2) ◽  
pp. 403-412 ◽  
Author(s):  
Adriano Sofo ◽  
Angelo Carmine Tuzio ◽  
Bartolomeo Dichio ◽  
Cristos Xiloyannis

Hoehnea ◽  
2019 ◽  
Vol 46 (4) ◽  
Author(s):  
Rodrigo Fazani Esteves Sanches ◽  
Ana Paula Oliveira da Silva ◽  
Vanessa Pires da Costa ◽  
Maria Ângela Machado de Carvalho ◽  
Emerson Alves da Silva

ABSTRACT Water stress is an environmental factor that can regulate growth, limit production and lead to physiological and biochemical changes. Plants present a series of adaptive responses to drought, such as osmotic adjustment, in which carbohydrates play an important role. To evaluate the influence of water deficit on carbohydrates accumulation in V. discolor, the plants were divided into two groups: daily watering and water suppression for 14 days being re-watering after this period. Leaves and roots were collected at 0, 3, 6, 9, 12, 15 and 18 days, for ecophysiological and biochemical analyzes. Variations in carbohydrate contents in V. discolor showed a close relationship with changes in the plant water status, with higher concentrations of soluble sugars, total fructans, oligosaccharides, reducing sugars coinciding with the lower values of soil moisture and leaf water potentials and relative water content. In the tuberous roots, there is an increase in carbohydrate concentrations after re-watering. The increase of these low molecular weight carbohydrates is involved in osmotic adjustment and therefore acts to protect against dehydration.


Irriga ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 512-526
Author(s):  
Wilian Rodrigues Ribeiro ◽  
Vinicius Agnolette Capelini ◽  
Daniel Soares Ferreira ◽  
Morgana Scaramussa Gonçalves ◽  
Edvaldo Fialho dos Reis

CRESCIMENTO DO CAFEEIRO CONILON CULTIVAR “ES8122-JEQUITIBÁ” EM FUNÇÃO DA FRAÇÃO DE ÁGUA TRANSPIRÁVEL NO SOLO     WILIAN RODRIGUES RIBEIRO1; VINICIUS AGNOLETTE CAPELINI2; DANIEL SOARES FERREIRA3; MORGANA SCARAMUSSA GONÇALVES1 E EDVALDO FIALHO DOS REIS1   1Departamento de Engenharia Rural, Programa de Pós-Graduação em Produção Vegetal do Centro de Ciências Agrárias e Engenharias da Universidade Federal do Espírito Santo - UFES, Alto Universitário S/N, Bairro Guararema, CEP: 29.500.000, Alegre, ES, Brasil, [email protected]; [email protected]; [email protected]. 2Departamento de Engenharia Rural, Programa de Pós-Graduação em Engenharia Rural da Universidade Federal de Viçosa - UFV, Avenida Peter Henry Rolfs, S/N, Campus Universitário, CEP: 36.570.900, Viçosa, MG, Brasil, [email protected]. ³Departamento de Fitotecnia, Programa de Pós-Graduação em Fitotecnia da Universidade Federal de Viçosa - UFV, Avenida Peter Henry Rolfs, S/N, Campus Universitário, CEP: 36.570.900, Viçosa, MG, Brasil, [email protected].     1 RESUMO   O Estado do Espírito Santo destaca-se como maior produtor de café conilon do Brasil, porém a deficiência hídrica tem sido o fator abiótico mais limitante da produção. Desta forma, objetivou-se neste trabalho, quantificar a influência do déficit hídrico no solo, pela metodologia da fração de água transpirável do solo (FATS), verificando o valor crítico onde se inicia a redução da transpiração relativa (TR), e do potencial de crescimento das plantas, através das variáveis: área foliar relativa (AFR) e altura relativa (ALR). O presente estudo foi desenvolvido em casa de vegetação da Universidade Federal do Espírito Santo, localizada no município de Alegre-ES. Utilizaram-se os nove clones que compõe a cultivar “ES8122-Jequitibá”, espécie Coffea canephora. O experimento foi constituído de dois tratamentos e quatro repetições. Os tratamentos foram: T0 (sem déficit hídrico, plantas irrigadas durante todo experimento) e T1 (déficit hídrico induzido até as plantas atingirem 10% da transpiração relativa do tratamento T0). Verificou-se que cada clone apresentou um comportamento específico em função do decréscimo FATS. O clone 02 foi o mais susceptível, apresentando redução da transpiração em valores de 0,90 da FATS. O clone 09 mais resistente, mantendo o processo transpiratório constante até valores de 0,56 da FATS.   Palavras-chave: déficit hídrico, Coffea canephora, fats, irrigação.     RIBEIRO, W. R.; CAPELINI, V. A.; FERREIRA, D. S.; GONÇALVES, M. S.; REIS, E. F. GROWTH OF COFFEE CONILON CULTIVAR “ES8122-JEQUITIBÁ” AS FUNCTION OF  TRANSPIRABLE WATER FRACTION IN SOIL     2 ABSTRACT The state of Espirito Santo stands out as the largest producer of Conilon coffee in Brazil, but water deficit has been the most limiting abiotic factor of production. Thus, the objective of this work was to quantify the influence of water deficit on the soil, by the fraction of transpirable soil water (FTSW) methodology, verifying the critical value where the reduction of relative transpiration (RT), and the potential plant growth, through the variables: relative leaf area (RLA) and relative height (RH). The present study was conducted in a greenhouse of the Federal University of Espírito Santo, located in the city of Alegre-ES. The nine clones that make up the cultivar “ES8122-Jequitibá”, species Coffea canephora, were used. The experiment consisted of two treatments and four repetitions. The treatments were: T0 (without water deficit, plants irrigated during the whole experiment) and T1 (induced water deficit until the plants reached 10% of the relative transpiration of treatment T0). Each clone showed a specific behavior as  function of the FTSW decrease. Clone 02 was the most susceptible, presenting a reduction in sweating by FTSW values ​​of 0.90. The most resistant, clone 09, kept the transpiratory process constant up to FTSW values ​​of 0.56.   Keywords: water deficit, Coffea canephora, FTSW, irrigation.


1982 ◽  
Vol 74 (5) ◽  
pp. 923-925 ◽  
Author(s):  
R. A. Bowman ◽  
S. R. Olsen

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