Data/hora: 23/09/2024 15:58:45

Biblioteca(s): 	Embrapa Mandioca e Fruticultura; Embrapa Semiárido.	
Data corrente: 	30/01/2008	
Data da última atualização: 	21/12/2015	
Autoria: 	LIMA FILHO, J. M. P.	
Afiliação: 	José Moacir Pinheiro Lima Filho, CPATSA.	
Título: 	Water status and gas exchange of umbu plants (Spondias tuberosa Arr. Cam.) propagated by seeds and stem cuttings.	
Ano de publicação: 	2007	
Fonte/Imprenta: 	Revista Brasileira de Fruticultura, Jaboticabal, v. 29, n. 2, p. 355-358, ago. 2007.	
Idioma: 	Inglês
Português	
Conteúdo: 	The experiment was carried out at the Embrapa Semi-Árido, Petrolina-PE, Brazil, in order to study the physiological responses of umbu plants propagated by seeds and by stem cuttings under water stress conditions, based on leaf water potential and gas exchange measurements. Data were collected in one-year plants established in pots containing 30 kg of a sandy soil and submitted to twenty-day progressive soil water deficit. The evaluations were based on leaf water potential and gas exchange data collection using psychrometric chambers and a portable infra-red gas analyzer, respectively. Plants propagated by seeds maintained a significantly higher water potential, stomatal conductance, transpiration and photosynthesis under decreasing soil water availability. However, plants propagated by stem cuttings were unable to maintain a favorable internal water balance, reflecting negatively on stomatal conductance and leaf gas exchange. This fact is probably because umbu plants propagated by stem cuttings are not prone to formation of root tubers which are reservoirs for water and solutes. Thus, the establishing of umbu plants propagated by stem cuttings must be avoided in areas subjected to soil water deficit.	
Palavras-Chave: 	Condutância estomática; Root tubers; Transpiração; Túbera.	
Thesagro: 	Fotossíntese; Potencial Hídrico; Umbu.	
Thesaurus Nal: 	photosynthesis; stomatal conductance; transpiration; water potential.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/135969/1/ID-36791.pdf	
Registro original: 	Embrapa Semiárido (CPATSA)	
Exemplares: 	CPATSA - (36791-1) - UPC - AP - PP -  -  -  - DIS
CNPMF - (24233-1) - ADC - AP - -- -  -  -  - DIS