Seedbank persistence, germination and early growth of glyphosate-resistant Kochia scoparia
Seedbank persistence, germination and early growth of glyphosate-resistant Kochia scoparia
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DOI：
10.1111/wre.12294
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发表时间：
2018-06-01
期刊：
影响因子：
1.7
通讯作者：
Johnson, E. N.
中科院分区：
文献类型：
--
作者：
Beckie, H. J.;Blackshaw, R. E.;Johnson, E. N.
本研究描述了抗草甘膦(GR)地鼠在加拿大西部两个地点的种子库持久性，并考察了来自加拿大西部和美国中西部的地鼠在低温条件下种子萌发和早期生长特征是否与其敏感地不同。种子埋深(2.5 cm、10 cm)对种子活力没有影响，随着时间的推移，活力损失分别为50%和90%，平均分别为210天和232天。与来自加拿大萨斯喀彻温省和美国堪萨斯州的对草甘膦敏感的千金莲相比，抗草甘膦的千金莲一般萌发较晚，累积发芽率也较低，但不是美国科罗拉多州的。同样，来自萨斯喀彻温省和堪萨斯州的GSK.specaria的第一片叶达到10%的时间往往比GRK.scope aria的时间更早，所有地区的种群在实验结束时达到第一片叶的GS和GR幼苗的比例都更高。种子库寿命短，萌发延迟和第一叶时间缩短，可能被利用来通过延迟预播种杂草控制或提早播种来提高作物竞争力，从而最大限度地提高管理效率。
This study describes the seedbank persistence of glyphosate-resistant (GR) Kochia scoparia at two sites in western Canada and examines if GRK.scoparia from western Canada and mid-western United States (USA) differ from their susceptible counterparts in seed germination and early growth characteristics at low-temperature regimes. Site or depth of seed burial (surface, 2.5cm, 10cm) did not affect seed viability over time and time to 50% and 90% loss of viability averaged 210 and 232days respectively. Glyphosate-resistant K.scoparia generally germinated later and had lower cumulative germination than glyphosate-susceptible (GS) K.scoparia from Saskatchewan, Canada; and Kansas, USA; but not Colorado, USA. Similarly, time to 10% first leaf of GSK.scoparia from Saskatchewan and Kansas tended to be sooner than that of GRK.scoparia, with a greater percentage of GS vs. GR seedlings of populations from all regions having attained first leaf by the end of the experiment. The short seedbank longevity and delayed and reduced germination and time to first leaf of GRK.scoparia may potentially be exploited to maximise management efficacy through delayed preseeding weed control or alternatively by early seeding date to enhance crop competitiveness.