Data/hora: 05/06/2024 11:20:37

Biblioteca(s): | Embrapa Soja.
Data corrente: | 21/12/2000
Data da última atualização: | 09/03/2006
Autoria: | GAZZONI, D. L.; SAMBUGARO, R.
Título: | Evaluation of soybean lines with parentals background resistant to stink bugs.
Ano de publicação: | 2000
Fonte/Imprenta: | In: INTERNATIONAL CONGRESS OF ENTOMOLOGY, 21., 2000, Foz do Iguassu. Abstracts... Londrina: Embrapa Soja, 2000.
Volume: | v.2
Páginas: | p.679.
Idioma: | Inglês
Conteúdo: | During the 1996 soybean season four field experiments were conducted aiming to compare 82 soybean genotypes from the Embrapa Soja stink bug resistance program. The lines were divided by its cycle (early, medium and late), and the early maturity group was also divided in two experiments, due to the high number of entries. Soybeans were sowed on late November on plots of 4m of four soybean rows, replicated four times. Stink bugs were sampled weekly using the beat cloth method, starting when each line reached the R1 growing stage, and large nymphs (>5 mm) and adults were counted. An application of endosulfan at 525 g ai/ha was performed on each plot whose stink bug population surpassed 4 specimens per meter of row (twice the recommended EDL). For higher precision of the pest control, samplings during the insect peak population were made twice a week. At the end of the soybean cycle, 2m of each central row of the plots were harvested to evaluate yield, seed quality and agronomic treats. No differences for foliar retention were found on maturity groups N and O, but on the M group the standard varieties showed significant higher retention than the breeding lines, and the line BRQ94-7318 was the only to loose all the leaves and without green stems. This line produced 3145 kg/ha, and the highest indexes for vigour and germination were associated to this line. The genotype BRQ94-9455 showed the lowest index of damaged seeds, and also the smallest seed weight, a treat considered associated to resistance to stink bugs. On the N group the line BRQ94-2937 showed an index of 55% of no damaged seeds, vielding 4274 kg/ha. On the O group, BRQ94-13431 presented the highest yield (3051 kg/ha), the highest index of no damaged seeds (55%) and the lowest index of damaged seeds (3%). These lines were recommended for further evaluation on he breeding program.
Palavras-Chave: | Brasil; HPR; Quality; Seed; Soybean.
Thesagro: | Linhagem; Progênie; Qualidade; Semente; Soja.
Thesaurus Nal: | Brazil; progeny.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (18158-1) - UMT - PL - -- - RF 339 -  -  - DIS