Aspectos morfológicos de frutos e sementes e caracterização citogenética de Crotalaria lanceolata E. Mey. (Papilionoideae - Fabaceae)

Abstract

tóxica infestante que ocorre no Estado de São Paulo, foram estudadas morfologicamente e citogeneticamente. Os frutos são secos, deiscentes, polispérmicos e do tipo legume. As sementes são reniformes e o embrião é constituído de eixo embrionário e dois cotilédones. A testa pode apresentar variadas tonalidades de castanhos. A germinação é epígea e fanerocotiledonar. A espécie apresenta número cromossômico diplóide 2n = 16 com formulação cariotípica 12M + 4SM e comprimento cromossômico médio geral de 3,340 ± 0,689.Palavras-chave: Citogenética, Crotalaria, fruto, germinação, semente ABSTRACT -(Morphological aspects of fruits and seeds and cytogenetic characterization of Crotalaria lanceolata E. Mey. (Papilionoideae -Fabaceae)). Crotalaria lanceolata, known popularly as "guizo-de-cascavel", "xique-xique" or "feijão-de-guizo", is a toxic weed that occurs in the state of Sao Paulo. Fruits, seeds and seedlings were studied morphologically and cytogenetically. The fruits are dry, dehiscent, polyspermic legumes. The seeds are kidney shaped and the embryo consists of an embryonic axis and two cotyledons. The seed tegument comes in various chestnut tones. Germination is phanerocotylar and epigeal. The species has a mitotic chromosome number 2n = 16 with karyotype formula 12M + 4SM; overall mean chromosome length is 3.340 ± 0.689.

Sandwich method applied to the screening of allelopathic action in Byrsonima spp. (Malpighiaceae)

“…For B. intermedia, the treatments also reduced cell division, which is the likely cause of the inhibitory effects on germination and root growth of lettuce observed in this study. The visible effects on germination and initial growth of the target plants are widely cited in the literature as secondary manifestations of changes that occur at the cellular and molecular level, such as inhibition of mitosis and/or changes in chromosomes, structure and nuclear dynamics (Ferreira and Áquila 2000;Andrade et al 2008). According to Leme and Marin-Morales (2009), the effects on cell proliferation are important in the assessment of cytotoxicity.…”

Monocrotaline presence in the Crotalaria (Fabaceae) plant genus and its influence on arthropods in agroecosystems

“…In general, Crotalaria presents annual, erect, bushy, determinate-growing plants, with simple, alternate, lanceolate to obovate leaves, and a slightly hairy surface and a glabrous stem (Tokarnia et al, 2000;Andrade et al, 2008;Flores and Miotto, 2005;Flores et al, 2009). The flowers are usually yellow, sometimes streaked with red, arranged in showy racemes, calyx larger than the corolla, opening from the base to the top in a staggered fashion.…”

“…Crotalaria species are known to contain non-protein amino acids and pyrrolizidine alkaloids (PAs) in length, and propagation is by seeds, which are small and reniform in shape, with a variation in the color of the tegument (Andrade et al, 2008).…”

Interação Entre Espécies Forrageiras Nativas E Cultivadas Em Condições De Semiárido

“…Portanto, alguns trabalhos encontrados na literatura com técnica convencional e coloração como em Andrade et al (2008); Silveira et al (2006) utilizam após secagem as lâminas corante conhecido como solução Giemsa 2%, sendo por 6 minutos em experimento realizado por Andrade et al (2008) e 10 minutos por Silveira et al (2006).…”