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Plant function and evolutionary biology
RESEARCH ARTICLE

Photosynthetic activity increases with leaf size and intercellular spaces in an allomorphic lianescent aroid Rhodospatha oblongata

Dulce Mantuano https://orcid.org/0000-0002-8049-6936 A E , Thales Ornellas B , Marcos P. M. Aidar C and André Mantovani https://orcid.org/0000-0003-4681-4950 D
+ Author Affiliations
- Author Affiliations

A Laboratório de Ecofisiologia Vegetal, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, Bloco A, sala A1-118, CCS, Cidade Universitária, 21941-590, Rio de Janeiro, RJ, Brazil.

B Escola Nacional de Botânica Tropical; Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, Jardim Botânico, 22460-030, Rio de Janeiro, Brazil.

C Centro de Pesquisas em Ecologia e Fisiologia, Núcleo de Pesquisa em Fisiologia e Bioquímica, Instituto de Botânica de São Paulo, São Paulo, SP, Brazil.

D Laboratório de Botânica Estrutural, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, Jardim Botânico, 22460-030, Rio de Janeiro, Brazil.

E Corresponding author. Email: dulcemantuano.ufrj@gmail.com

Functional Plant Biology 48(6) 557-566 https://doi.org/10.1071/FP20215
Submitted: 24 July 2020  Accepted: 17 December 2020   Published: 9 February 2021

Abstract

This study aimed to investigate leaf anatomy, as well as photosynthetic gas exchange, that underlie the improvement in light foraging capacity, which appears to occur in aroid vines seeking light exposure. Three levels of plant height (soil level, 3 m and 6 m) were categorised for the aroid vine Rhodospatha oblongata Poepp. to represent the transition from ground to canopy. Compared with shaded leaves, leaves exposed to high light conditions were thicker, presenting a larger, spongy parenchyma characterised by a larger transversal area of intercellular spaces. In addition to the increase in maximum CO2 assimilation (Amax) and thicker and larger leaf lamina, we found an increased light saturation point, light compensation point and water use efficiency at 500 µmol PPFD. Nitrogen content per leaf dry mass remained constant across habitats, but Amax/N was 1.5-times greater in the canopy position than in the leaves at soil level, suggesting that CO2 gain did not rely on an N-related biochemical apparatus. The lower δ13C discrimination observed at high canopy leaves corroborated the higher photosynthesis. Altogether, these results suggest that the large and exposed aroid leaves maintained carbon gain coupled with light gain through investing in a more efficient proportion of intercellular spaces and photosynthetic cell surface, which likely allowed a less pronounced CO2 gradient in substomatal-intercellular space.

Keywords: aroid vines, canopy height, CO2 absorption, leaf morpho-physiology, leaf thickness, light foraging, mesophyll conductance, Rhodospatha oblongata Poepp.


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