Genotypic value in hybrid progenies of Panicum maximum Jacq.

Abstract

Genetic breeding of forage plants has increasingly contributed to the release of more productive plants. In this regard, evaluating the genotypic value is essential when aiming to rank genotypes based on the mean free of environmental factors. Therefore, this study aimed to predict the genotypic value of agronomic and nutritive value characters of three progenies of Panicum maximum. Hybrids were evaluated in a clonal test in an incomplete-randomized design with three treatments (progenies 1, 2, and 3) and two replications (clones). Six harvests were performed at 25cm from the ground level throughout one year. Progeny 2 provided better results for total and leaf dry mass yield, regrowth, and height, and lower incidence of leaf spot. Progenies 1 and 3 had a better response for qualitative characters such as higher crude protein and digestibility and lower lignin and fiber content. Hybrid progenies of P. maximum have forage characters of interest for breeding, and when using ‘Mombaça’ grass as parents, the progeny stands out for leaf production and resistance to leaf spot and for ‘Tanzania’ grass as parent has resulted in better forage quality.

High-Resolution Linkage Map With Allele Dosage Allows the Identification of Regions Governing Complex Traits and Apospory in Guinea Grass (Megathyrsus maximus)

“…Higher heritability values (<0.85) for LDM and RC and a value for PLB above 0.4 were recently reported in M. maximus (Lara et al, 2019), using the generalized heritability formula (Cullis et al, 2006). For this species, a greater amount (g/plant) of TDM and LDM in the progenies has been associated with considerable heritability from the most productive parents (Braz et al, 2013;Braz et al, 2017). Matias et al (2019) also verified the same pattern in interspecific hybrids from Urochloa spp., another genus adapted to tropical conditions.…”

“…The sexual parent was derived from sexual x apomictic crosses of an original diploid sexual plant that was duplicated with colchicine (Savidan and Pernès, 1982); thus, both parents were autotetraploid (2n = 4x = 32) (Savidan et al, 1989). In addition to the reproductive mode, the parents have contrasting agronomic and nutritional quality traits (Braz et al, 2017). S10 is a medium sized plant (1.4 m tall) with medium width leaves (2.4 cm wide).…”

High-resolution Linkage Map with Allele Dosage Allows the Identification of an Apomixis Region and Complex Traits in Guinea Grass (Megathyrsus maximus)

“…Higher heritability values (< 0.85) for LDM and RC and a value for PLB above 0.4 were recently reported in M. maximus , using the generalized heritability formula (Cullis et al, 2006). For this species, a greater amount (g/plant) of TDM and LDM in the progenies has been associated with considerable heritability from the most productive parents (Braz et al, 2013(Braz et al, , 2017. Matias et al (2019) also verified the same pattern in interspecific hybrids from Urochloa spp., another genus adapted to tropical conditions.…”

“…The sexual genotype was derived from sexual x apomictic crosses of an original diploid sexual plant that was duplicated with colchicine (Savidan and Pernès, 1982); thus, both parents were autotetraploid (2n = 4x = 32) (Savidan et al, 1989). In addition to the reproductive mode, the parents have contrasting agronomic and nutritional quality traits (Braz et al, 2017). DNA extraction followed the protocol described by Doyle and Doyle (1987), with modifications.…”

Potássio na amenização dos efeitos tóxicos induzidos pelo cádmio no capim tanzânia

“…O Panicum maximum cv. Tanzânia é um dos cultivares de maior destaque no cenário pecuário nacional, especialmente em sistemas de produção intensivos (Braz et al 2017;Paciullo et al 2017). O capim tanzânia tem crescimento cespitoso, apresenta porte médio (em torno de 1,2 m, sob livre crescimento), folhas médias (em torno de 2,6 cm de largura), decumbentes e desprovidas de pilosidade.…”