Produção de forragem de híbridos tetraploides de grama forquilha

Palavras-chave: Apomixia, Melhoramento genético, Hibridação intraespecífica, Paspalum notatum

Resumo

No sul do Brasil, boa parte da atividade pecuária é desenvolvida em pastagens nativas. Estudos sobre caraterísticas agronômicas, tolerância ao frio e valor nutritivo das espécies forrageiras nativas têm aumentado, e melhores resultados de eficiência produtiva (ganho animal) são alcançados. O objetivo deste trabalho foi avaliar a produção de forragem de 45 híbridos intraespecíficos de progênies segregantes de grama-forquilha (Paspalum notatum Flügge), através de análises conduzidas em casa de vegetação e determinar o modo de reprodução dos híbridos selecionados. Os híbridos tiveram grande variabilidade para as características analisadas. As plantas com a mais alta produção total de matéria seca foram 17PN10P3 e 17PN29P1 (reprodução sexual), 17PN10P5, 17PN16P3 e 17PN28P4 (reprodução apomítica). A alta correlação da matéria seca total com o número de perfilhos e com a massa seca total das raízes indica que as plantas híbridas podem ser usadas como forrageiras e para recuperação de áreas degradadas, reduzindo os efeitos da erosão do solo. As avaliações das características agronômicas e a determinação do modo de reprodução dos híbridos selecionados permitem a identificação de materiais genéticos promissores para produção de forragem e para cobertura de solo, selecionando-os para as próximas fases do programa de melhoramento.

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Publicado
2022-05-17
Como Citar
GHELLAR JUNIOR , I.; ANTONIOLLI, J.; KRYCKI, K.; LIMA, M.; WEILER, R.; BRUNES, A.; SIMIONI, C.; DALL’AGNOL, M. Produção de forragem de híbridos tetraploides de grama forquilha. Pesquisa Agropecuária Gaúcha, v. 28, n. 1, p. 94-110, 17 maio 2022.

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