Reaction of forest species to low oxygen availability. II. Effects on dry matter yield and distribution

• Autor(a) principal: Pelacani, Claudinéia Regina
• Data de Publicação: 1998
• Outros Autores: Oliveira, Luiz Edson Mota de, Cruz, Jailson Lopes
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/4822
• topic: flooding; anoxia; dry matter yield; partitioning; anoxia; inundação; produção de matéria seca; partição

This work was carried out aiming to evaluate dry matter yield and distribution and development of morphological structures of exotic and indigenous forest trees from Alto Rio Grande, MG, Brazil, under low oxygen availability in the growing medium, and to identify those showing adaptation to those conditions. The evaluated species were Sesbania sesban, Eriobotrya japonica, Hevea brasiliensis and Macchaerium villosum. The trial was conducted under greenhouse conditions, with two oxygen levels in the growing medium; four replicates were used for each treatament. Growing medium consisted of coarse sand irrigated with nutrient solution. Although low oxygen availability caused negative effects on the evaluated characteristics, all plants were still alive by the end of the stress period (55 days). Development of adventitious roots and lenticels in the submerged region of the stem was greater in S. sesban and E. japonica, but did not favor dry matter production on these species. On the other hand, H. brasiliensis besides remaining alive showed no significant decreases on total dry matter production due to oxygen stress.