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

Erilva Machado Costa; José Eduardo Macedo Pezzopane; Sandro Dan Tatagiba; Talita Miranda Teixeira Xavier; Rogério de Souza Nóia Júnior; Daniel Salgado Pifano; Jullyanna Nair de Carvalho

doi:10.14393/BJ-v38n0a2022-62906

Authors

Erilva Machado Costa Universidade Federal do Vale do São Francisco https://orcid.org/0000-0002-7268-0709
José Eduardo Macedo Pezzopane Universidade Federal do Espírito Santo https://orcid.org/0000-0003-0024-4016
Sandro Dan Tatagiba Instituto Federal do Pará https://orcid.org/0000-0002-9827-336X
Talita Miranda Teixeira Xavier Universidade Federal do Espírito Santo https://orcid.org/0000-0001-8918-1191
Rogério de Souza Nóia Júnior Technische Universität München https://orcid.org/0000-0002-4096-7588
Daniel Salgado Pifano Universidade Federal do Vale do São Francisco https://orcid.org/0000-0001-8361-7337
Jullyanna Nair de Carvalho Universidade Federal de Lavras https://orcid.org/0000-0003-1228-6731

DOI:

https://doi.org/10.14393/BJ-v38n0a2022-62906

Keywords:

Climate variability, Natural rubber, Photosynthesis rates, Tropical tree species, Water use efficiency.

Abstract

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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