Physiological responses to drought of Cnidoscolus quercifolius Pohl in semi-arid conditions

Abstract

This study aimed to evaluate the physiological behavior of faveleira (Cnidoscolus quercifolius Pohl) plants grown in the field, in Caatinga, during wet and dry seasons. Adult plants were selected for evaluation in March and April (wet season) and May and June (dry season), during 2016. We evaluated the soil water content, water potential (Ψw), osmotic potential (Ψπ), relative water content (RWC), stomatal conductance (gs), transpiration rate (E), photosynthetic rate (A), intercellular CO2 concentration (Ci), instantaneous water use efficiency (A/E) and carboxylation efficiency (A/Ci). The reduction in water availability in the soil promoted a marked decrease in soil water potential, which was more affected than the relative water content. The opening of the stomata was affected by the decrease in soil moisture content, reducing the stomatal conductance, transpiration rate, photosynthesis rate, instantaneous water use efficiency and carboxylation efficiency. The photosynthesis was more affected than transpiration by the reduction in soil moisture content.

Arbuscular Mycorrhizal Fungi Inoculation as a Climate Adaptation Strategy for Establishment of Swietenia macrophylla King. Seedlings

“…Moreover, chlorophyll content in seedlings of Albizia lebbeck and Cassia siamea was found to be less under water stress [61]. Results shows similarity to [62,63] who found increased chlorophyll concentrations in AMF inoculated seedlings subjected to drought stress.…”

Crescimento, Produção De Biomassa E Trocas Gasosas De Mudas De Lonchocarpus Sericeus (Poir.) Dc Sob Diferentes Ciclos De Irrigação / Growth, Biomass Production and Gas Exchanges in Lonchocarpus Sericeus (Poir.) Dc Seedlings Under Irrigation Cycles

“…No entanto, atenção especial deve ser dada a este último fator, evitando-se tanto o encharcamento como o déficit hídrico, pois o excesso de água reduz a disponibilidade de oxigênio para as raízes, além de aumentar a susceptibilidade das mudas ao ataque de patógenos (AVRELLA et al, 2019). Por sua vez, a baixa disponibilidade de água pode causar estresse hídrico, afetando as trocas gasosas entre as plantas e a atmosfera, reduzindo a fotossíntese e, dessa forma, comprometendo o crescimento das mesmas (ALBUQUERQUE et al, 2013;COSTA et al, 2015;FRANÇA et al, 2017;FREIRE, 2019;DIVINCULA et al, 2020).…”