Effects of NH4
            + and NO3
            − on sexual dimorphism responses to manganese stress in a dioecious tree species

Zhao, Hongxia; Zhang, Sheng; Li, Junyu; Song, Mengya; Pang, Jiayin

doi:10.1007/s00468-017-1644-1

Cited by 6 publications

(1 citation statement)

References 82 publications

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“…Many factors can influence stress intensity such as plant species and type of stress . So far, only one research has been found regarding the effect of N exclusively as NO3or NH4 + (3.75 mmol L -1 ) associated with rates of Mn, which studied the sexual dimorphism of Populus cathayana L. under Mn toxicity, without assessing the increases in the phytoextraction potential (Zhao et al, 2018). The results of that study indicated that proportions of NO3 -/NH4 + might have the potential to increase the tolerance of plants to excess Mn.…”

Section: Introductionmentioning

confidence: 99%

Proportions of nitrate and ammonium and their impact in two species of >i<Poaceae>/i<: a study with nanoparticles and ionic nutrients in soil and nutrient solution

Junior¹,

de²

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Proporções de nitrato e amônio e seus impactos em duas espécies de Poaceae: um estudo com nanopartículas e nutrientes iônicos em solo e solução nutritivaO nitrogênio (N) é o principal modulador do crescimento de gramíneas forrageiras. Estudos mostraram que o fornecimento de proporções de nitrato e amônio (NO3 -/NH4 + ) melhoraram a performance do capim tanzânia [Panicum maximum Jacq. cv. Tanzania (syn. Megathyrsus maximus (Jacq.) B.K.Simon & S.W.L. Jacobs)] em situação de toxidez por excesso de cobre (Cu). No entanto, há poucos relatos indicando o efeito positivo de proporções de NO3 -/NH4 + em gramíneas que receberam Cu via nanopartículas, excesso de manganês (Mn) ou sofreram limitação nutricional de S. Por isso, planejaram-se um experimento com milho (Zea mays L.) e dois com capim tanzânia com o objetivo de confirmar a hipótese que proporções de NO3 -/NH4 + alteram a performance de gramíneas em condição de excesso e limitação de nutriente: i) um fatorial 2 × 4 em blocos completos ao acaso com quatro repetições, sendo os fatores: duas proporções de NO3 -/NH4 + (100/0 e 50/50) combinada com quatro doses de nanopartículas de cobre (Cu) (0, 25, 50 e 100 mg kg -1 ) em um Espodossolo da Florida, Estados Unidos, cultivado com milho; ii) um fatorial 2 × 4 em blocos completos ao acaso com quatro repetições, sendo os fatores: duas proporções de NO3 -/NH4 + (100/0 e 70/30) combinadas com quatro doses de Mn (10, 500, 1.500 e 3.000 µmol L -1 ) em solução nutritiva cultivada com capim tanzânia e; iii) um fatorial 2 × 3 em blocos completos ao acaso com quatro repetições, sendo os fatores: duas proporções de NO3 -/NH4 + (100/0 e 70/30) combinadas com três doses de enxofre (S) (0,1, 1,0 e 2,0 mmol L -1 ) em solução nutritiva cultivada com capim tanzânia. No experimento i) a produção de massa seca foi mais alta nas plantas de milho que receberam N na proporção 100/0 NO3 -/NH4 + , a qual propiciou maior disponibilidade de Cu e acumulação desse nutriente tanto na parte aérea quanto nas raízes, melhores crescimento, fotossíntese e absorção de nutrientes, aumento do pH do solo, especialmente na rizosfera, melhora na disponibilidade de nutrientes importantes, bem como a diminuição de outros tóxicos. No experimento ii) o excesso de Mn 3.000 µmol L -1 não afetou o crescimento do capim tanzânia. A máxima concentração de Mn foi obtida nas plantas que receberam todo o N na forma de NO3e Mn 3.000 µmol L -1 , com valores acima do reportado para hiper acumuladoras. Esse efeito induziu o estresse oxidativo no capim, afetando negativamente a atividade da glutamina sintetase e fotossíntese. No entanto, nessa condição, ocorreu aumento da concentração de prolina, a qual foi relacionada à melhor sobrevivência da planta em situação de alto Mn. No experimento iii) em situação de suficiência de S, plantas crescidas com N na forma de NO3e NH4 + cresceram melhor e acumularam mais S do que plantas crescidas com N somente como NO3 -. A aplicação de NH4 + em plantas sob limitação de S induziu maior acumulação de NO3nas raízes do que nas plantas crescidas ...

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Section: Introductionmentioning

confidence: 99%

Proportions of nitrate and ammonium and their impact in two species of >i<Poaceae>/i<: a study with nanoparticles and ionic nutrients in soil and nutrient solution

Junior¹,

de²

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Photochemistry differs between male and female Juniperus communis L. independently of nutritional availability

Rabska

Robakowski

Ratajczak

et al. 2020

Trees

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Key message Juniperus communis males are better adapted than females to changing, seasonal environmental conditions due to their higher photosynthetic capacity and the higher concentration of photosynthetic pigments in their needles. Males cope with ROS more efficiently than females having greater carotenoids concentration in needles. Abstract In dioecious woody plants, females often exhibit greater reproductive effort than male plants and as a result, they can be more vulnerable to different stressors. We hypothesized that female plants of J. communis L. could have a lower photochemical capacity and a higher level of antioxidant enzyme activity and that these differences between males and females would be more pronounced under conditions where nutrient availability is limited. We also assume that additional stressors connected with different seasons would increase those differences. Male and female plants of J. communis growing in fertilized or non-fertilized soils were used to test this hypothesis. The effect of fertilization and sex on photochemical parameters derived from chlorophyll a fluorescence light curves, and on the concentrations of photosynthetic pigments in needles, was determined in different seasons within 2 years. To assess the tolerance of male and female plants to the nutrient deficit, antioxidant enzyme activity, and the level of reactive oxygen species (ROS) were determined. Results revealed sex-related differences in photochemical parameters, level of antioxidant enzyme activity, H2O2 levels, the concentration of photosynthetic pigments, and in the leaf mass-to-area ratio. This indicates that J. communis males could be better adapted than females to changing, seasonal environmental conditions due to their higher photosynthetic capacity, as reflected by their higher ETRmax, and a higher concentration of photosynthetic pigments in their needles. The sex-related differences concerning photosynthetic capacity and stress response found in our study are constitutive traits of each sex and are genetically based as they occurred independently of fertilization.

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Sexual differences in gas exchange and chlorophyll fluorescence of Torreya grandis under drought stress

Wang

Liu

et al. 2021

Trees

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Effects of NH4 + and NO3 − on sexual dimorphism responses to manganese stress in a dioecious tree species

Cited by 6 publications

References 82 publications

Proportions of nitrate and ammonium and their impact in two species of >i<Poaceae>/i<: a study with nanoparticles and ionic nutrients in soil and nutrient solution

Proportions of nitrate and ammonium and their impact in two species of >i<Poaceae>/i<: a study with nanoparticles and ionic nutrients in soil and nutrient solution

Photochemistry differs between male and female Juniperus communis L. independently of nutritional availability

Sexual differences in gas exchange and chlorophyll fluorescence of Torreya grandis under drought stress

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