Influence of herbivory and Gap-openness on whole-plant growth OF Brosimum alicastrum (Moraceae)

Acta Biológica Colombiana

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Title Influence of herbivory and Gap-openness on whole-plant growth OF Brosimum alicastrum (Moraceae)
Influencia de la herbivoría y la apertura de claros sobre el crecimiento total de Brosimum alicastrum (Moraceae)
 
Creator Carrillo Herrera, Edgar Fernando
Dzib Ek, Susana Ariely
Ballina Gomez, Horacio Salomon
 
Subject análisis de crecimiento
bosques tropicales
defoliación
establecimiento de plantas
penetración de luz
Interaccion planta-insecto
crecimiento vegetal
growth analysis
tropical forests
defoliation
plant establishment
light penetration
 
Description Compensatory plant growth and plant defense are responses to deal with herbivory and light availability. The research focused on compensatory growth responses explained through the influence of morphological and physiological components of plant growth, allocation mass, and plant defense could clarify such process. We studied the effects of herbivory and gap-openness on compensatory growth responses, morphological and physiological components, allocation mass, and chemical defenses in seedlings of Brosimum alicastrumin a subhumid tropical forest. We used a nested design with understory and gap-openness site (n = 3 each) within each replicated site seedling belong to three herbivory treatments (n = 10 each): control, simulated, and natural; and along six months we studied the influence of leaf herbivory on plant growth (mass, leaf area, height, diameter, and leaf production) and production of phenols and leaf toughness. We recorded compensatory growth responses (all plant growth variables) with natural herbivory, subcompensatory (mass, height, and diameter) with simulated and, overcompensatory (leaf production) with natural herbivory although only under gap-openness. We found a higher leaf area ratio (LAR) and specific leaf area (SLA) (both morphological components) under gap-openness and high values of net assimilation rate (NAR) on understory. The mass proportion was highest in leaves and stems on the understory and higher in roots under gap-openness. Leaf herbivory was highest under gap-openness while the phenols of the leaves on understory. We did not find a relationship (trade-off) between defense with plant growth, but it was possible to underline a negative pattern of the leaf phenols under limiting resources environment such as understory.
El crecimiento compensatorio y las defensas vegetales son respuestas para lidiar con la herbivoría y la luz. El estudio de la influencia de los componentes morfo-fisiológicos, de la asignación de biomasa y de la defensa vegetal podría arrojar información que ayude a entender estas respuestas. Se evaluaron los efectos de la herbivoría y la apertura de claros sobre el crecimiento, los componentes morfo-fisiológicos, la asignación de biomasa y las defensas químicas y físicas en plántulas de Brosimum alicastrum en una selva mediana subcaducifolia. Se utilizó un diseño anidado con sitios de sotobosque y claros (n = 3 en cada uno) y dentro de ellos plántulas sometidas a tres tratamientos de herbivoría: control (n = 10), simulada (n = 10) y natural (n = 10). Se registró a lo largo de seis meses la influencia de la herbivoría sobre el crecimiento (biomasa, área foliar, altura, diámetro y producción de hojas), la producción de fenoles y la dureza foliar. Se halló un crecimiento compensatorio (todas las variables de crecimiento) con la herbivoría natural, subcompensatorio (biomasa, altura y diámetro) con la simulada, y sobrecompensatorio (producción de hojas) con la herbivoría natural sólo en claros. Los componentes morfológicos como el cociente del área foliar (LAR) y el área foliar específica (SLA) fueron mayores bajo claros y el fisiológico, como la tasa de asimilación neta (NAR), en sotobosque. La proporción de biomasa en sotobosque fue mayor hacia hojas y tallos y en claros más alta hacia raíces. La herbivoría fue mayor en claros y los fenoles foliares en sotobosque. No se encontró una relación (compromiso) entre las defensas y el crecimiento, sólo una tendencia negativa con los fenoles bajo condiciones limitantes de recursos, como ocurre en el sotobosque.
 
Publisher Universidad Nacional de Colombia - Sede Bogotá - Faculdad de Ciencias - Departamento de Biología
 
Date 2021-01-15
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
 
Format application/pdf
 
Identifier https://revistas.unal.edu.co/index.php/actabiol/article/view/83289
10.15446/abc.v26n2.83289
 
Source Acta Biológica Colombiana; Vol. 26 Núm. 2 (2021); 186 - 195
Acta Biológica Colombiana; Vol. 26 No. 2 (2021); 186 - 195
1900-1649
0120-548X
 
Language spa
 
Relation https://revistas.unal.edu.co/index.php/actabiol/article/view/83289/77681
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https://creativecommons.org/licenses/by-nc-sa/4.0
 

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