Gas Exchanges and Antioxidant Activity in <i>Copaifera langsdorffii</i>Desf. Seedlings after Flooding

• 作者: Daiane Mugnol Dresch Derek Brito Chaim Jardim Rosa Silvana de Paula Quint?o Scalon Thais Cremon
• 来源期刊: 美国植物学期刊(英文)
• 学科: 医学
• 关键词: Water Stress Photosynthesis CHLOROPHYLL A Fluorescence Antioxidant Enzymes
• 年，卷（期）: 2018,（5）
• 页码范围: 979-994
• 页数: 16页
• 分类号: R73

摘要

The Copaifera langsdorffii Desf. seedlings, popularly known as “copaiba” or diesel tree, present a natural occurrence in the riparian forests of the Brazilian Cerrado, however, not much is known about their capacity to recover from flooding, particularly when the focus is on their establishment and use in programs for the recovery of degraded areas near watercourses and subject to flooding. The objective of this study was to evaluate over time the recovery of the efficiency of the photosynthetic apparatus and the antioxidant activity of C. langsdorffii seedlings flooded during different periods. The pots with the seedlings were placed in a plastic tank and submerged with water, and were removed from the flood condition every 21 days (0, 21, 42, 63 and 84 days), and evaluated every 30 days (0, 30, 60, 90 and 120 days). The seedlings tolerated the flooding for up to 42 days, recovering after suspension of this condition. Seedlings flooded for 63 and 84 days showed lower recovery capacity after flooding, independently of the evaluation period. Under these conditions, lower efficiency of the photosynthetic apparatus, gas exchange, photo assimilate production and seedling quality were observed.