BRESSANIN, L. A.

ESTEVES, G. de F.

MAGALHAES, P. C.

PASQUAL, M.

SOUZA, K. R. D. de

SOUZA, T. C. de

English

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Anais do XVII Congresso Brasileiro de Fisiologia Vegetal (http://sbfv.org.br/#!/anais) Página 206 de 326Millet,	maize	and	sorghum	grow	typically	on	Samarco’s	mining	tailingsGisele	de	Fátima	Esteves,		Letícia	Aparecida	Bressanin,		Kamila	Rezende	Dázio	de	Souza,		Moacir	Pasqual,		Paulo	César	Magalhães,		Thiago	Corrêa	de	Souza,Universidade	Federal	de	Alfenas­ UNIFAL­MG,	 	Universidade	Federal	de	Alfenas­ UNIFAL­MG,	 	Universidade	Federal	de	Alfenas­ UNIFAL­MG,	 	 UNIVERSIDADE	 FEDERAL	 DE	 LAVRAS	 ­UFLA­MG,	 	 Embrapa	 Milho	 e	 Sorgo,	 Sete	 Lagoas­MG.,		Universidade	Federal	de	Alfenas­ UNIFAL­MG,With the failure of the Fundão dam in Mariana­MG in 2015, over 50 million m³ of tailings were leaked, leaving a trail of destruction and socio­environmental consequences from Minas Gerais to the mouth of the Doce River in Espírito Santo. Samples have undergone chemical and physical characterization, which revealed some chemical elements above of that allowed by regulations. Furthermore, physical and chemical attributes of the tailings led to compaction trend, which restricts the flora’s restoration. Thus, the present study aimed to analyse the effects of the mining tailings from the Fundão dam on seedling germination and initial growth of three plant species: millet (Pennisetum glaucum (L.) R. Br., 1502), maize (Zea mays L., DKB390) and sorghum (Sorghum bicolor, BRS332). Therefore, such species were grown in germination boxes containing different proportions of mining tailings (T) and sand (S), respectively: 1T, 3T:1S, 1T:1S, 1T:3S, 1S, for 9 days. Each treatment had 5 replicates of 50 seeds. The parameters analysed were germination percentage (G%) an index velocity of germination (IVG) in 48h and, after 9 days, shoot and root length, chlorophyll a fluorescence parameters (Qy_max, maximum quantum yield of PSII photochemistry; qP, photochemical quenching; qN, non­photochemical quenching) and seedlings dry biomass. Tailings interfere in a non­proportional way in the germination of seeds. For the seedlings of millet and sorghum, there was an increase in shoots height proportionally to the amount of tailings, while a reduction of root length occurred for the three species. Only maize showed an increase in dry biomass relational to the mining tailings. As for fluorescence, small variations were observed in maize and sorghum seedlings only. Therefore, the mining tailings from the Fundão dam show little interference in the initial growth of millet, maize and sorghum.Keywords: Soil compaction, Pennisetum glaucum, Zea mays, Sorghum bicolor, germination

Millet, maize and sorghum grow typically on Samarco?s mining tailings.

https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1119134/1/Milletmaize.pdf

Millet, maize and sorghum grow typically on Samarco?s mining tailings.

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