Effects of plant extracts of Bothriochola pertusa and Urochloa mosambicensis on seed germination and seedling growth of Stylosanthes hamata cv. Verano and Stylosanthes scabra cv. Seca
Effects of plant extracts of Bothriochola pertusa and Urochloa mosambicensis on seed germination and seedling growth of Stylosanthes hamata cv. Verano and Stylosanthes scabra cv. Seca
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DOI：
10.1071/a97036
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发表时间：
1997-01-01
影响因子：
--
通讯作者：
Jones, RJ
中科院分区：
文献类型：
--
作者：
Hu, FD;Jones, RJ
研究了渗透胁迫和4种牧草水浸液对热带豆科牧草种子萌发和幼苗生长的影响。hamata（L.）陶布湾维拉诺和S.糙叶藓CV.塞卡被调查。B植物提取物的化感作用。pertusa（L.）A.加缪是在S.斯卡普拉Seca的发芽率较低（35%），根长较短（35%）。乌藨子Urostella mosambicensis（Hack.）丹迪尼克松对Seca发芽没有不利影响，但也降低了Seca根长。没有证据支持B.孔菌对Verano种子萌发或幼苗生长具有化感作用。Verano和Seca提取物对Seca的发芽率、苗重、根长和Verano的根长也有抑制作用，根长比苗长更敏感，根长在300 mmol/kg以下不受渗透势的影响，而苗重和苗长则随渗透势的增加而线性下降（r分别为-0.92和-0.99）。Verano和Seca在甘露醇和聚乙二醇-600（PEG）溶液中的萌发反应在300 mmol/kg以下相似，但在600 mmol/kg的甘露醇中Verano具有显著更高的萌发。使用经校正的对照处理对从使用蒸馏水对照处理得出的结论几乎没有影响。
Effects of osmotic stress and of aqueous plant extracts from 4 pasture species on seed germination and seedling growth of the tropical legumes S. hamata (L.) Taub cv. Verano and S. scabra Vog. cv. Seca were investigated. Allelopathic effects of plant extracts from B. pertusa (L.) A. Camus were measured on S. scabra cv. Seca in terms of lower germination (35%) and shorter root length (35%). Extracts from Urochloa mosambicensis (Hack.) Dandy cv. Nixon had no adverse effect on Seca germination, but also reduced Seca root length. There was no evidence to support the hypothesis that B. pertusa had allelopathic effects on Verano germination or seedling growth. Extracts from Verano and Seca also reduced germination, seedling weight, and root length of Seca as well as root length of Verano.Root length was more sensitive than seedling length for ascertaining allelopathic effects, as there was no osmotic potential effect on root length up to 300 mmol/kg, whereas seedling weight and shoot length declined linearly with increasing osmotic potential (r = -O.92 and -0.99, respectively). Germination responses of Verano and Seca in solutions of both mannitol and polyethylene glycol-600 (PEG) were similar up to 300 mmol/kg, but at 600 mmol/kg Verano had a significantly higher germination in mannitol.Since the osmotic potential of the plant extracts did not exceed 78 mmol/kg, the use of osmotically adjusted control treatments had little effect on the conclusions drawn from using a distilled water control treatment.