Allelopathic activity of chemical substances isolated from Brachiaria brizantha cv. Marandu and their variations in function of pH

被引：13
|
作者：
Santos, L. S. [1 ]
Santos, J. C. L. [1 ]
Souza Filho, A. P. S. [2 ]
Correa, M. J. C. [1 ]
Veiga, T. A. M. [1 ]
Freitas, V. C. M. [1 ]
Ferreira, I. C. S. [1 ]
Goncalves, N. S. [1 ]
Silva, C. E. [1 ]
Guilhon, G. M. S. P. [1 ]
机构：
[1] Fed Univ Para, BR-66075900 Belem, Para, Brazil
[2] Embrapa Amazonia Oriental, BR-66095100 Belem, Para, Brazil
来源：
PLANTA DANINHA | 2008年 / 26卷 / 03期
关键词：
Brachiaria brizantha; friedelin; friedelinol; Gramineae; weed;
D O I：
10.1590/S0100-83582008000300008
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
This work aimed to isolate, identify and determine the allelopathic activity of the chemical Substances produced by Brachiaria brizantha cv. Marandu and to verify the effects of the pH in the solution on the activity of these compounds. The allelopathic activity was evaluated based on germination bioassays and radicle and hypocotyl growth using the species 'malicia' (Mimosa pudica) and 'mata-pasto' (Senna obtusifolia) as receptors. The effect of pH was analyzed in a range from 3.0 to 9.0. The pentacyclic triterpenes friedelin and epifriefelinol isolated from the shoots of B. brizantha showed a low inhibitory activity against seed germination and radicle and hypocotyl growth of the two receptor plants evaluated. The pentacyclic triterpenes friedelin and epifrifelinol presented differentiated behaviors in relation to the pH variation in the solution, with stronger inhibition activity against the weed 'mata-pasto'.
引用
收藏
页码：531 / 538
页数：8
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