AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

Sociedade Brasileira da Ciencia das Plantas Daninhas

PEREZ, N.B.¹  FAVARETTO, A.²  SCHEFFER-BASSO, S.M.² 

[1] Embrapa Pecuária Sul, Bagé, Brazil;Universidade de Passo Fundo, Passo Fundo, Brazil

关键词: allelopathy;    aqueous extracts;    Eragrostis plana;    germination.;   

DOI  :  10.1590/s0100-83582017350100037

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL-1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL-1, showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.

【 授权许可】

CC BY