Growth and gas exchange of Tachigali vulgaris submitted to water deficiency

Aims: This objective of this work was to evaluate the effects of water deficiency on physiological aspects of oiticica plants, as well as the capacity of potassium fertilization to attenuate such effects. Study Design: The treatments were distributed in an entirely randomized design (DIC), consisting of a 4x4 factorial, with four levels of potassium (K) and four water turning, with five repetitions. Place and Duration of Study: The experiment was conducted in a shaded environment, with 50% light interception, in the Forest Nursery of UAEF/UFCG, between January 2020 and July 2020. Methodology: The relative water content (RWC), transpiration (E) and photosynthesis (A) rates, stomatal conductance (gs), and internal CO2 concentration (Ci) were evaluated, and from the values of A and E, the intrinsic water use efficiency (EUAi) was calculated and, with the data of A and Ci, the carboxylation efficiency (A/Ci). Results: There was significant interaction of treatments in the parameters RWC, E, gs, A and EUAi and isolated effect of water turning on Ci and A/Ci. Irrigation daily or every five days provided the maintenance of higher water status and better stomatal behavior, and the plants were sensitive to water stress provided by longer water turnings (every 10 and 15 days). The fertilization with 100 and 150 mg dm-3 of K kept the values of E and A high, even under low water availability. Conclusion: Potassium fertilization proved to be effective in attenuating the negative effects caused by water deficiency on gas exchange and WUEi of the seedlings, with highlights for 100 and 150 mg dm-3 of K levels.

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“…Reduction in RWC due to water deficit has been reported in other studies [19,20,21,22]. However, in aroeira (Myracrodruon urundeuva Fr.…”

Section: Resultsmentioning

confidence: 64%

Gas Exchange of Oiticica Seedlings in Response to Potassium Fertilization and Water Turning

Sousa

Freire

2022

JEAI

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“…The combined effect of different atmospheric evaporative demands and water availability levels resulted in alteration of the carbon partitioning in the rubber seedlings clones, caused by a reduction in gas exchanges and an increase in photorespiration (Ataíde et al 2018). These changes reduced the allocation of photoassimilates to the shoot and directed them to root development, which may be associated with abscisic acid production (ABA), which induces root growth, stimulating the emergence of side roots for better water absorption, supporting leaf growth (Wang et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Atmospheric evaporative demand and water deficit on the ecophysiology of Rubber seedlings

et al. 2022

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The search for genetic materials resistant to adverse weather conditions has been a major focus in studies on species of economic interest. The objective of the present study was to assess the growth and photosynthesis of rubber seedlings clones under two conditions of atmospheric evaporative demand, characterized by fluctuations in temperature (TEMP) and vapor pressure deficit (VPD), associated to two water regimens. Hevea brasiliensis Muell. Arg (RRIM 600 and FX 3864) clones were assessed in two microclimates, at low (TEMP 21.2 ºC and VPD 0.29 Kpa) and high (TEMP 26.9 ºC and VPD 1.49 Kpa) atmospheric evaporative demand, under two water regimens: water deficit and well-watered. Water deficit 50% water availability was sufficient to reduce the net CO2 assimilation rate, leaf area and total chlorophyll of the clones studied that impacted growth in both microclimates. The effects of water deficit on growth and net carbon assimilation rate were intensified under high atmospheric evaporative demand. However, when comparing the two clones studied, RRIM 600 showed greater growth and photosynthesis without water restriction. The FX 3864 clone, despite the high CO2 assimilation values under high atmospheric demand and without water restriction, showed a reduced growth. The results of this study form an important basis for the selection of genotypes with the potential to develop in adverse climatic conditions. In this sense, the RRIM 600 genotype is recommended as a promising material that would best adapt under adverse climatic conditions.

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“…É possível que o tempo tenha sido insuficiente para que as mudas pudessem demonstrar diferenças em altura, em função dos tratamentos, como também constatado por Ataíde et al (2018). Nascimento et al (2011) notaram que Hymenaea courbaril, aos 55 dias de avaliação, evidenciou diferença significativa quanto à altura.…”

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Manejo hídrico em mudas de Moringa oleifera

Costa¹,

Silva²,

Costa³

et al. 2021

ABC

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Este trabalho teve como objetivo avaliar a produção de mudas de Moringa oleifera em função do manejo hídrico. O experimento foi conduzido em casa de vegetação na Universidade Federal Rural do Semi-Árido, em delineamento inteiramente casualizado, com três tratamentos: rega diária (RD), rega a cada 3 dias (R3D) e rega a cada 6 dias (R6D), com cinco mudas por tratamento. Avaliaram-se semanalmente a altura, o diâmetro e o número de folhas e, ao final do experimento, foi determinado o peso seco da folha, do caule e da raiz, assim como a alocação de biomassa foliar, caulinar e radicular, além do índice de qualidade de Dickson. Os diferentes intervalos de rega não afetaram as variáveis avaliadas, com exceção do número de folhas e a alocação de biomassa foliar, que foram reduzidos para o tratamento R6D. Em condições de viveiro, pode ser adotado o ciclo de rega a cada 3 dias, sem prejuízos no desenvolvimento da espécie em foco, ou a cada 6 dias, embora nesse caso haja perda de folhas, com benefícios ambientais e econômicos tanto para o produtor quanto para a natureza.

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Growth and gas exchange of Tachigali vulgaris submitted to water deficiency

Cited by 4 publications

References 20 publications

Gas Exchange of Oiticica Seedlings in Response to Potassium Fertilization and Water Turning

Gas Exchange of Oiticica Seedlings in Response to Potassium Fertilization and Water Turning

Atmospheric evaporative demand and water deficit on the ecophysiology of Rubber seedlings

Manejo hídrico em mudas de Moringa oleifera

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