GERMINAÇÃO E CRESCIMENTO INICIAL DE Machaerium brasiliense VOGEL (FABACEAE) EM CASA DE VEGETAÇÃO

Abstract

ResumoMachaerium brasiliense Vogel é uma espécie arbórea, conhecida popularmente como pau-sangue, jacarandá-bico-de-pato e sapuva. Com o objetivo de verificar a germinação, sementes de M. brasiliense foram mantidas sob temperatura de 20°, 25° e 30 °C, em câmara de germinação com fotoperíodo de 12h ou escuro contínuo. Para análise do crescimento inicial, avaliaram-se, aos 90, 180, 270 e 360 dias após o transplante (DAT), a altura, o comprimento da raiz, a massa seca da parte aérea, da raiz e total e o número de folhas de plantas mantidas em casa de vegetação. A presença ou ausência de luz não influenciou o desempenho das sementes, observando-se maior porcentagem de germinação (PG) para as sementes submetidas a 20 e 25 °C, o mesmo sendo verificado para o parâmetro índice de velocidade de germinação (IVG). O menor tempo médio de germinação (TMG) foi observado a 30 °C. Em relação aos parâmetros de crescimento, os maiores valores foram obtidos aos 270 e 360 DAT, não ocorrendo diferença estatística entre esses dois períodos de avaliação. A presença de nódulos radiculares foi observada a partir dos 180 DAT. Palavras-chave: M assa seca; nódulos; parte aérea; raiz; temperatura. Abstract Germination and initial growth of Machaerium brasiliense Vogel (Fabaceae) in a greenhouse. Machaerium brasilienseVogel is an arboreal species, popularly known as "pau-sangue", "jacarandá-bico-de-pato" and "sapuva" (State of Paraná, Brazil). A iming to analyze the germination, M. brasiliense seeds were kept at 20°, 25° and 30° C in a growth chamber with a 12h photoperiod or continuous darkness. For initial growth, plants were analyzed for height, length of root, shoot and root dry mass, total dry mass and the number of leaves at 90, 180, 270 and 360 days after transplanting (DAT).The presence or absence of light showed no effect on the performance of seeds, with a higher germination percentage (PG) found for seeds at 20 and 25 °C, as verified for the germination speed index (IVG). The shortest average germination time (TMG) was observed at 30 °C. Regarding the growth parameters, the highest values were obtained at 270 and 360 DAT, with no statistical difference between these two evaluation periods. The presence of root nodules was verified from 180 DAT. Keywords: Dry mass; nodules; shoot; root; temperature. INTRODUÇÃOFabaceae é considerada a maior família de plantas no Brasil, co m 2.100 espécies e 188 gêneros, dos quais 31 são endêmicos, estando representada em todos os biomas brasileiros (ANDRADE et al., 2009). Entre os gêneros de Fabaceae, Machaerium é predominantemente neotropical, co m apro ximadamente 130 espécies de árvores, arbustos e lianas, ocorrendo do sul do México ao norte da Argentina, sendo que no Brasil há cerca de 80 espécies (FILA RDI;LIMA, 2014).Macherium brasiliense Vogel (Fabaceae -Faboidae), conhecida como pau-sangue, jacarandá, canelado-brejo ou sapuva, é uma espécie arbórea com cerca de 6-13 metros de altura, heliófila, característica de formações semideciduais, ocorrendo do Maranhão ao Paraná (LORENZI, 2014), sendo...

Lonchocarpus cultratus (Vell.) A.V.G. Azevedo & H.C. Lima (Fabaceae) growth under different shade and water availability conditions

“…The nodules present in the roots of L. cultratus were rounded protrusions occurring in lateral roots, which was also observed by Pastorini et al (2016)…”

“…The nodulation occurred spontaneously, and no inoculation procedure was performed. Pastorini et al (2016) reported that Machaerium brasiliense Vogel presented nodules only after 180 days. The authors also mentioned that root nodulation is a characteristic of Fabaceae, and that information about nodulation capacity of most native trees is still lacking.…”

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