Data/hora: 11/06/2024 00:15:50

Biblioteca(s): | Embrapa Agroenergia.
Data corrente: | 24/06/2021
Data da última atualização: | 30/06/2021
Autoria: | GOMES, F. P.; ALMEIDA, A. F. de; MIELKE, M. S.; LAVIOLA, B. G.; SILVA, L. D. da.
Afiliação: | FÁBIO PINTO GOMES, Universidade Estadual de Santa Cruz; ALEX-ALAN FURTADO DE ALMEIDA, Universidade Estadual de Santa Cruz; MARCELO SCHRAMM MIELKE, Universidade Estadual de Santa Cruz; BRUNO GALVEAS LAVIOLA, CNPAE; LEANDRO DIAS DA SILVA, Universidade Estadual do Sudoeste da Bahia.
Título: | Nocturnal acidification in leaves of two genotypes of Jatropha curcas L., subjected to soil water deficit.
Ano de publicação: | 2021
Fonte/Imprenta: | Plant Physiology Reports, v. 26, p. 220-230, 2021.
Volume: | 26
Páginas: | p. 220-230
ISSN: | 2662-2548
DOI: | https://doi.org/10.1007/s40502-021-00576-2
Idioma: | Inglês
Conteúdo: | Jatropha curcas has been considered as a potential oil source for biodiesel production in tropical and subtropical areas. The relationships between water deficit-induced nocturnal acidification and leaf succulence, gas exchange rates and water relations in leaves of J. curcas were accessed in a greenhouse experiment. Two genotypes, from regions of Brazil with contrasting climate (CNPAE183, from a dry and hot tropical climate and CNPAE191, from a humid subtropical climate), were maintained under full irrigation or were subjected to water deficit for 49 days followed by recovery for 7 days. Leaf relative water content decreased with water deficit from 85.4 to 77.5%, in both genotypes. Pre-dawn leaf water potential decreased from - 0.5 MPa in irrigated plants - 1.0 MPa (in CNPAE183) and to - MPa (in CNPAE191). Slow and less intense decrease of leaf gas exchange in CNPAE191 than in CNPAE183 suggests a high effective water use under water deficit in the former. Leaf nocturnal acidification increased 4.3-fold in water deficit plants of both genotypes and a positive correlation between nocturnal acidification and leaf succulence, expressed as fresh mass per dry mass, was observed. Water deficit-induced nocturnal acid accumulation and a positive correlation between nocturnal acidification and leaf succulence were thoroughly demonstrated. While such nocturnal acidification may be related to osmotic adjustment, its correlation with leaf succulence suggests a weak CAM-cycling activity in leaves of J. curcas which, along with other water-conserving mechanisms, may help to explain the widely reported drought tolerance of this species.
Palavras-Chave: | Leaf gas exchange.
Thesagro: | Bioenergia; Euphorbiaceae.
Thesaurus Nal: | Bioenergy; Drought tolerance; Jatropha.
Categoria do assunto: | --
Registro original: | Embrapa Agroenergia (CNPAE)
Exemplares: | CNPAE - (3873-1) - UPC - AP - DD -  -  -  - DIS