Data/hora: 23/09/2024 18:01:48

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	15/04/1997	
Data da última atualização: 	18/01/2012	
Autoria: 	WARRAG, M. O. A.; HALL, A. E.	
Título: 	Reproductive response of cowpea (Vigna unguiculata (L.) Walp.) to heat stress. II. Responses to night air temperature.	
Ano de publicação: 	1984	
Fonte/Imprenta: 	Field Crops Research, v. 8, n. 112, p. 17-33, 1984.	
Idioma: 	Inglês	
Conteúdo: 	The influence of high night temperature and drought on the abscission of reproductive organs were studied with cowpea (Vigna unguiculata (L.) Walp. cv. 'California Blackeye n. 5') in controlled environments. Floral development of cowpeas at 33/22oC day/night temperature appeared to be normal. However, at 33/30oC day/night temperature all flowers abscissed within 48 h after anthesis due to male sterility resulting from abnormar pollen development and anther indehiscence. By moving plants between growth chambers with high and moderate night temperatures,  it was demonstrated that the stage of floral development most sensitive to high night temperature occurred  5-7 days before anthesis. This corresponds with the stage just after the release of the tetrads from the microscope mother cell sac. Plants subjected to drought were smaller, and at the lower night temperature drought resulted in less seed production but this was due to fewer reproductive nodes and the percent abscission of reproductive organs was not influenced by drought. Observations were made on the effects of high temperatures on reproductive growth of six cowpea strains grown under field conditions. Complete abscission of flowers was observed during hot weather under field conditions followed by pod set approximately 6 days after decreases innight temperature. These data are consistent with the observations on cowpeas in growth chambers which demonstrated that high night temperatures can cause male sterility and complete abscission of flowers.	
Palavras-Chave: 	Caupi; Cowpea; Estress por calor.	
Thesagro: 	Stress; Vigna Unguiculata.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (6039-1) - ADC - SP - -- - S 10672 -  - S 10672 - DIS