Morphological and physiological variation in Toona ciliata under water and salinity stress

Andrade, Ramon Silveira de; Navroski, Márcio Carlos; Pereira, Mariane de Oliveira; Sá, Alexandra Cristina Schatz

doi:10.1590/0103-8478cr20190581

Cited by 3 publications

(2 citation statements)

References 8 publications

(5 reference statements)

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“…There is an imminent need to identify tree species with productive timber potential for cultivation in different regions of the world to promote diversity in forest production [ 18 , 19 , 20 , 21 ]. In this context, T. ciliata has great potential in tropical regions, where it finds favorable conditions for its vegetative development in a manner similar to that required by native cedars [ 22 ]. However, worldwide agricultural production is based on the frequent application of herbicides, which can affect areas of vegetation and the cultivation of adjacent wood species.…”

Section: Introductionmentioning

confidence: 99%

Hormetic Effect Caused by Sublethal Doses of Glyphosate on Toona ciliata M. Roem

de Faria,

Carlos,

Jakelaitis

et al. 2023

Plants

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This study aimed to evaluate the response of Toona ciliata seedlings to sublethal doses of glyphosate. The increasing use of glyphosate in agriculture concerns the scientific community, as the drift of this pollutant into aquatic systems or atmospheric currents can affect non-target species. Therefore, we need to understand how non-target species respond to small doses of this herbicide. T. ciliata seedlings (clone BV-1110) were exposed to sublethal doses of glyphosate (0, 9.6, 19.2, 38.4, 76.8 g ae ha−1). Anatomical, physiological, and photochemical analyses were performed 60 days after herbicide application, and growth assessments were carried out after 160 days of cultivation. We found that sublethal doses of glyphosate above 19.2 g ae ha−1 induced toxicity symptoms in Toona ciliata leaves. These symptoms were mild in some cases, such as chlorosis, but severe in other cases, such as tissue necrosis. We observed a positive relationship between increased plant height and photochemical yield with plant exposure to sub-doses 9.6 and 19.2 g ae ha−1. A sublethal dose of 38.4 g ae ha−1 improved the photosynthetic rate and carboxylation efficiency. Thus, we confirmed the hypothesis of a hormetic effect when T. ciliata was exposed to sub-doses of glyphosate equal to or lower than 38.4 g ae ha−1. However, the sublethal dose of 76.8 g ae ha−1 must be considered toxic, impacting photosynthetic activity and, consequently, the height of T. ciliata. The stem diameter of T. ciliata responded positively to increasing glyphosate doses. This occurs to compensate for the negative effect of glyphosate on water absorption. Further research will provide valuable information for harnessing the potential benefits of hormesis to improve the productivity of T. ciliata.

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Section: Introductionmentioning

confidence: 99%

Hormetic Effect Caused by Sublethal Doses of Glyphosate on Toona ciliata M. Roem

de Faria,

Carlos,

Jakelaitis

et al. 2023

Plants

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“…Throughout their life cycle, plants are subjected to different environmental conditions, oftentimes unfavorable to their development. Water stress can occur due to both a lack or excess of water supplied (Andrade et al, 2020), causing morphophysiological changes in plants, such as increased stomatal resistance, reduced photosynthesis (Bonfim-Silva et al, 2011), changes in transpiration rates, growth inhibition, leaf wilting and/or abscission, reduced yielding, etc. (Rodrigues et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

ANATOMICAL CHANGES IN Urochloa plantaginea AND Urochloa platyphylla UNDER DIFFERENT SOIL MOISTURE CONDITIONS

Macedo

Dornelles

Essi

et al. 2021

Int J Innov Educ Res

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Urochloa plantaginea and Urochloa platyphylla are common weeds in the highland area. However, in recent years, they have been found in wetlands and poorly drained soils, but the biology and behavior of the species in these conditions are not known. Thus, the objective was to assess anatomical changes in plants of Urochloa plantaginea and Urochloa platyphylla grown under different soil moisture conditions, as well as the adaptive structures generated as a result of each environment. A completely randomized experimental design in the form of a 2x2 factorial design was used, with factor A being two species of Urochloa (U. plantaginea and U. platyphylla), and species B being three soil moisture conditions (50 and 100% FC and 5 cm water depth), with four repetitions. The assessments were performed by means of anatomical cuts, observing the number and diameter (micrometers - μm) of aerenchymas in stems, roots and leaves; total diameter and the central root cylinder (μm); diameter of the fistula medulla and cortex (μm) in stems; mesophyll thickness and leaf midrib (μm). It was found that, for the two species of Urochloa, the water depth condition induced an increase in the number and diameter of aerenchymas in roots and leaves and provided a larger diameter of the fistulous pith in stems. The diameter of the central cylinder and the thickness of the leaf mesophyll midrib were more compact at 50% FC, also, for both species. Therefore, the adaptive structures generated vary as a result of the field capacity of the soil.

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Estresse hídrico e salino no crescimento inicial de mudas de Toona ciliata var. australis

Sá¹,

Lazarotto

Avrella

et al. 2023

Pesq. Flor. Bras.

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O objetivo deste estudo foi avaliar os efeitos do estresse salino e hídrico no crescimento inicial de mudas de cedro australiano (Toona ciliata var. australis). O estresse salino foi avaliado em dois experimentos, em delineamamento inteiramente casualizado (DIC), testando-se cinco potenciais osmóticos (0,0; -0,3; -0,6; -0,9 e -1,2 MPa). Para o estresse hídrico, foram estabelecidos cinco faixas de tensão hídrica, também em DIC (0 a -7; -7,1 a -14,0; -14,1 a -21,0; -21,1 a -28,0 e -28,1 a -35,0 kPa). Ao final dos experimentos, foram avaliados: altura da parte aérea, diâmetro do coleto, massa seca da parte aérea, das raízes e total e sobrevivência das mudas. O uso de soluções salinas provocou redução de todas as variáveis de crescimento das mudas. Até o nível de -21 kPa de estresse hídrico há aumento de altura e relação entre altura da parte aérea e diâmetro do coleto, sendo as outras variáveis reduzidas a partir do primeiro nível testado. A tolerância das mudas aos estresses avaliados permite o ajuste das condições de manejo no viveiro antes da ocorrência de perdas e pode representar também uma tolerância a essas condições adversas em campo.

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Morphological and physiological variation in Toona ciliata under water and salinity stress

Cited by 3 publications

References 8 publications

Hormetic Effect Caused by Sublethal Doses of Glyphosate on Toona ciliata M. Roem

Hormetic Effect Caused by Sublethal Doses of Glyphosate on Toona ciliata M. Roem

ANATOMICAL CHANGES IN Urochloa plantaginea AND Urochloa platyphylla UNDER DIFFERENT SOIL MOISTURE CONDITIONS

Estresse hídrico e salino no crescimento inicial de mudas de Toona ciliata var. australis

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