Data/hora: 21/06/2024 18:48:10

Biblioteca(s): | Embrapa Amazônia Oriental; Embrapa Unidades Centrais.
Data corrente: | 04/08/1999
Data da última atualização: | 25/01/2021
Autoria: | DIAS-FILHO, M. B.
Afiliação: | MOACYR BERNARDINO DIAS FILHO, CPATU.
Título: | Physiological responses of two tropical weeds to shade. I. growth and biomass allocation.
Ano de publicação: | 1999
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 6, p. 945-952, jun. 1999.

Idioma:

Inglês
Português

Conteúdo: | Ipomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in Brazilian Amazonia, were grown in controlled environment cabinets under high (800-1000 umol m-2 s-1) and low (200-350 umol m-2 s-1) light regimes during a 40-day period. For both species leaf dry mass and leaf area per total plant dry mass, and leaf area per leaf dry mass were higher for low-light plants, whereas root mass per total plant dry mass was higher for high-light plants. High-light S. cayennensis allocated significantly more biomass to reproductive tissue than low-light plants, suggesting a probably lower ability of this species to maintain itself under shaded conditions. Relative growth rate (RGR) in I. asarifolia was initially higher for high-light grown plants and after 20 days started decreasing, becoming similar to low-light plants at the last two harvests (at 30 and 40 days). In S. cayennensis, RGR was also higher for high-light plants; however, this trends was not significant at the first and last harvest dates (10 and 40 days). These results are discussed in relation to their ecological and weed management implications.
Palavras-Chave: | Allocation patterns; Alocacao de biomassa; Analise de crescimento; Brasil; Growth analysis; Growth rate; Ipomoea asarifolia.
Thesagro: | Fisiologia Vegetal; Stachytarpheta Cayennensis; Taxa de Crescimento.
Thesaurus Nal: | Amazonia; biomass; plant physiology.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/11430/1/pab394_96i.pdf
Registro original: | Embrapa Amazônia Oriental (CPATU)

Exemplares:

AI-SEDE - (11430-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS
CPATU - (3303-1) - UPC - AP - PP - 630.5 - P472 - 100 - DIS