Data/hora: 10/06/2024 08:22:33

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 26/03/1993
Data da última atualização: | 26/03/1993
Autoria: | MCKINNEY, N. V.; SCHAPAUGH, W. T.; KANEMASU, E. T.
Título: | Selection for canopy termperature differential in six populations of soybean.
Ano de publicação: | 1989
Fonte/Imprenta: | Crop Science, v.29, n.2, p.255-259, 1989.
Idioma: | Inglês
Conteúdo: | Canopy temperature represents a quantitative measurement of a plants response to heat and drought stess. Information is needed concernin thegenetic variability for canopy temperature (Tc) in segreating populations if plant breeders are to effectively maniulate Tc. This study was conducted to characterize genetic variation for canopy temperature in populations of soybean [Glycine max (L.) Merr.] and to assess the effectiveness of selection within the populations for canopy temperature. Parent plants, F 19 and F2 individuals were space planted and a hand-held infrared thermometer was used to monitor plants for Tc on 3 d during late vegetative and early reproductive growth in 1982. Advanced F3 and F3:4 lines from each population were monitored in unreplicated progeny rows for Tc following canopy closure in 1983 and the four warmest (HOT) and four coolest (COOL) F14 lines were selectedfor further study. Selected lines in the F3:6 generation were replicated in 1984 and monitored for Tc. Heritability estimates for seasonal mean canopy temperature differential (Td=canopy temperature-air temperature) based on parent-progeny regression ranged from 1 to 22% for F2 and F3 parent-progeny regression: and 0 to 19% for F3:4 and F3:6 parent-progeny regression. Rank correlations of F3:4 vs. F3:6 lines for Td were significant in three of six populations. The mean Td of the HOT vs. COOL selections measured in 1984 were significantly different in three populations, indicating effective F3:4 selection. Early...
Palavras-Chave: | Resistance; SDD; Soybean.
Thesagro: | Glycine Max; Resistência; Seca; Soja; Temperatura.
Thesaurus Nal: | drought; temperature.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (2372-1) - ADD - SP - -- -  -  - 1991.04082 - DIS