Germination and emergence of Stachytarpheta cayennensis and Ipomoea asarifolia

Resumo

Understanding how weed seed germination and emergence respond to environmental factors is critical to determining their adaptive capabilities and potential for infestations, and could also aid in the development of effective control practices. Germination of Ipomoea asarifolia (Desr.) Roem. & Schultz and Stachytarpheta cayennensis (Rich) Vahl. decreased linearly with decreasing osmotic potentials. Also, increasing osmotic stress delayed germination of Ipomoea more than that of Stachytarpheta. Ipomoea germination was insensitive to light, while Stachytarpheta showed a positive photoblastic behavior. Nitrate had a negative effect on germination of Ipomoea seed under both light and dark conditions but stimulated dark germination of Stachytarpheta. Ipomoea emergence was not significantly affected by planting depth. However, for Stachytarpheta emergence was restrited to seeds planted at the soil surface. Emergence of Ipomoea seedlings from greater than 6cm significantly decreased the amount of biomass allocated to roots, while biomass allocated to leaves was decreased for seedlings that emerged from depths greater than 2cm. These germination and emergence responses are discussed in relation to their ecological implications and to weed control strategies.

Resumo conforme Crossref.

Palavras-chave

• Estresse osmótico
• Germinação de semente
• Ipomoea asarifolia
• Emergência
• Nitrato
• Profundidade de Semeadura
• Radiação Luminosa
• Stachytarpheta Cayennensis

Termos atribuídos na Alice (Embrapa) (incluindo Thesagro e NAL Thesaurus).

Fontes bibliográficas

Esta publicação está registrada em 3 fontes de metadados.

• Alice (Embrapa)Handle doc/407347Abrir registro em Alice (Embrapa) (nova aba)
• CrossrefDOI 10.1590/s0100-83581996000200005 · ISSN 0100-8358Abrir registro em Crossref (nova aba)
• OpenAlexW2063713219 · DOI 10.1590/s0100-83581996000200005 · ISSN 0100-8358 · ISSN 1806-9681Abrir registro em OpenAlex (nova aba)