Data/hora: 24/06/2024 00:38:24

Biblioteca(s): 	Embrapa Trigo.	
Data corrente: 	10/01/2010	
Data da última atualização: 	13/06/2013	
Autoria: 	SUMNER, L. C.; DORSCHNER, K. W.; RYAN, J. D.; EINKENBARY, R. D.; JOHNSON, R. C.; MCNEW, R. W.	
Título: 	Reproduction of Schizaphis graminum (Homoptera: aphididae) on resistant and susceptible wheat genotypes during simulated drought stress induced with polyethylene glycol.	
Ano de publicação: 	1986	
Fonte/Imprenta: 	Environmental Entomology, Maryland, v. 15, n. 3, p. 756-762, 1986.	
Idioma: 	Inglês	
Conteúdo: 	Biotype C greenbug, Schizaphis graminum (Rondani), reproduction was studied on resistant and susceptible winter wheat (Triticum aestivum L.) genotypes grown under four levels of simulated drought stress, Water potentials of 0, ?3, ?6, and ?9 MPa in the root medium were obtained by addition of polyethylene glycol (PEG) (M, = 1,000) to the hydroponic nutrient solutions. Wheat plants and greenbugs living on the solutions absorbed PEG, but a toxicity study of PEG in artificial diet showed that greenbug fecundity and survival was not diminished by concentrations normally encountered during this aphid/plant interaction study. The intrinsic rate of greenbug population growth (rm) decreased with increasing stress on both genotypes, but was higher on the susceptible `Sturdy' than on the resistant genotype `OK 80268', Although generation length was unaffected by stress, greenbugs on `Sturdy' had shorter generation lengths than on `OK 80268'. For no variable was interaction observed between genotype and stress level, indicating that the level of resistance of `OK 80268' relative to `Sturdy' was maintained during drought stress. Stress reduced greenbug longevity, but host genotype had no effect. Reduced longevity seemed 1:0 be the major cause of reduced rm values during stress for `Sturdy'. Reduced fecundity and mean offspring per reproductive day contributed most to stress-induced rm declines in `OK 80268'. Reduced generation length, prereproductive period, mean reproductive period, and greater mean offspring per reproductive day were apparently the major factors causing rm values to be higher for `Sturdy' than `OK 80268'.	
Thesagro: 	Seca; Trigo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
Exemplares: 	CNPT - (16674-1) - ADD - SP - -- - 02755 -  - 02755 - DIS