Influence of environmental factors on germination and emergence of Pueraria lobata

被引:25
|
作者
Susko, DJ
Mueller, JP
机构
[1] N Carolina State Univ, Dept Crop Sci, Raleigh, NC 27695 USA
[2] N Carolina State Univ, Dept Crop Sci, Raleigh, NC 27695 USA
关键词
Pueraria lobata (Willd.) Ohwi PUELO; kudzu; light temperature; scarification; pH osmotic stress; planting depth; simulated flooding; weed biology; PUELO;
D O I
10.1017/S0043174500092304
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Laboratory and greenhouse studies were conducted to determine the effect of several environmental factors on seed germination and seedling emergence of the invasive weed Pueraria lobata (kudzu). Germination occurred over a range of alternating temperatures from 15/6 to 35/25 C. Seed germinated equally well in alternating light/darkness and continuous darkness. At all temperature regimes, percentage germination was much greater for hand-scarified seed (95 to 100%) than for nonscarified seed (7 to 17%), indicating that P. lobata seed possesses physical dormancy. Germination exceeded 51% in solutions with pH 5 to 9. Maximum germination (99%) was observed in distilled water at pH 5.4. Germination was greatly reduced in solutions with osmotic potentials below -0.4 MPa (28% at -0.6 MPa, and 13% at -0.9 MPa); no germination was observed at -1.3 MPa. Percentage emergence was greater than 45% at burial depths in soil of 0.5 to 10 cm, with maximal emergence (72 to 85%) at depths of 0.5 to 4 cm. Seed sown on the soil surface had low seedling emergence (< 13%). No seedlings emerged when seed was exposed to flooding for 7 d or more. Pueraria lobata seed is capable of germinating in a variety of climatic and edaphic conditions, but flooding may severely limit establishment of stands by seed. Nomenclature: Pueraria lobata (Willd.) Ohwi PUELO, kudzu.
引用
收藏
页码:585 / 588
页数:4
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