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- Title
Heat Stress Affects the Physiological and Biochemical Quality of Dalbergia nigra Seeds in vitro.
- Authors
Simões, Ingridh Medeiros; Baptista, Julcinara Oliveira; Rosa, Thuanny Lins Monteiro; Mello, Tamyris de; Araujo, Caroline Palacio de; Lima, Paula Aparecida Muniz de; Anjos, Breno Benvindo dos; Oliveira, João Paulo Bestete de; Caldeira, Marcos Vinicius Winckler; Otoni, Wagner Campos; Alexandre, Rodrigo Sobreira; Lopes, José Carlos
- Abstract
The jacaranda of Bahia (Dalbergia nigra (Vell.) Allemão ex Benth) is an endemic tree of a Brazilian neotropical biodiversity hotspot and is of great ecological and economic interest. Given the threat of extinction due to timber overexploitation and climate change, the present study aimed to analyze the physiological and biochemical quality of D. nigra seeds exposed to heat stress. The seeds were sown in a test tube containing woody plant culture medium, kept in a biochemical oxygen demand chamber at 45°C for 0, 24, 48, 72, and 96 hours, and then maintained in the same chamber at 25°C for 30 days. Physiological analyses of moisture, electrical conductivity, germination speed index, normal and abnormal seedlings, seedling length, root length, hypocotyl length, collar diameter, seedling and root dry mass, and Dickson quality index revealed a drop in germination and vigor with prolonged heat stress, dropping from 95% to 0% between 0 and 96 hours. This was accompanied by a reduction in the content of carbohydrates, lipids, and proteins. Therefore, the vigor and quality of seedlings is negatively influenced by exposure to heat stress at 45°C.
- Subjects
BAHIA (Brazil : State); PLANT growing media; PHYSIOLOGICAL stress; BIOCHEMICAL oxygen demand; SEEDLING quality; WOODY plants; ENDANGERED species
- Publication
Forest Science, 2021, Vol 67, Issue 6, p731
- ISSN
0015-749X
- Publication type
Article
- DOI
10.1093/forsci/fxab036