02673nab a2200313 i 4500 BR-BrBNA 20240927121149.0 240927b2022 bl.qr|pooa||| 00| 0 eng | BR-BrBNA eng F60 F61 Pacheco, Fernanda Ventorim Alvarenga, Ivan Caldeira Almeida BertoluccI, Suzan Kelly Vilela Pinto, José Eduardo Brasil Pereira Alvarenga, Amauri Alves de Water suppression indicates the prevalence of the secondary defense system in Piper aduncum Publicação on-line; Bibliography p. 47-50 (52 ref.); 4 tables; 2 illus.; Summary (En) ABSTRACT The aim of this work was to evaluate the response of Piper aduncum to water suppression. The experiment was conducted in a greenhouse, in an entirely randomized blocks, with five treatments: 0, 2, 4, 6, and 8 days without irrigation. After this period, dry matter, photosynthetic pigments (chlorophyll a, b, and carotenoids), leaf temperature, activity of the enzymes ascorbate peroxidase (APX), catalase (CAT) and superoxide dismutase (SOD) were evaluated. The essential oil content of leaves and roots was also quantified through hydrodistillation, as well as the identification of constituents by CG-MS. The period of water suppression influenced the content of chlorophyll a, carotenoids, and enzymatic activity of APX and CAT. The activities of APX and CAT were reduced under low water availability (CAT only increased after 4 days of suppression). Meanwhile, SOD had its activity increased under eight days of water suppression. In addition, there was an increase in essential oil content when subjected to stress. The predominant classes of constituents in the leaves were sesquiterpenes (32.56-36.54%) and phenylpropanoids (33.12- 44.97%) in the roots. E-nerolidol was the major constituent of leaves (23.56- 26.75%) and apiol (17.57-32.78%) of the roots. Thus, water suppression favors the secondary metabolism of the species. Keywords: Terpenes, phenylpropanoids, medicinal plants, water stress, essential oil. PIPERACEAE PLANTA MEDICINAL COMPOSTO ORGÂNICO ÓLEO ESSENCIAL DEFICIÊNCIA HÍDRICA 3543 344879 Botucatu-SP Instituto de Biociências - Departamento de Química e Bioquímica 1998 2024-5207 Revista Brasileira de Plantas Medicinais (Brazil) 1516-0572 v. 24(2) p. 38-50; (2022) BR2024002596 https://www.sbpmed.org.br/admin/files/papers/file_UgUsUux8IxMz.pdf ANA 327851 327851