Water restriction, salinity and depth influence the germination and emergence of sourgrass

IF 0.8 Q3 Agricultural and Biological Sciences Planta Daninha Pub Date : 2020-01-01 DOI:10.1590/s0100-83582020380100057
Jackson Zambão, Henrique v.H. Bittencourt, Lisandro T.S. Bonome, Michelangelo M. Trezzi, Augusto C.P.P. Fernandes
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Abstract

Background: Substantial losses to crops can occur due to the presence of sourgrass in agroecosystems, which is promoted by its seed dispersal ability. Environmental factors can affect sourgrass germination and emergence. Objective: The objective of this study was to determine the effects of water restriction, salinity, and depth of sowing on the sourgrass germination and emergence processes. Methods: Experiments using sourgrass seeds were conducted under controlled conditions simulating osmotic and saline stress and seeding depths. The data collected was submitted to analysis of variance and adjusted to models by regression analysis. Results: Smaller osmotic potentials reduced germination, normal seedlings, and increased quiescence, with no germination occurring from -0.80 MPa. Salinity caused a decrease in germination from 20 mM NaCl, influencing the percentage of normal and abnormal seedlings and quiescent seeds. Seed depth influenced the emergence of seedlings, with the maximum percentage of emergence (83%) in the seeds placed on the substrate surface. The maximum depth from which sourgrass seedlings emerged was 7.6 cm. Conclusions: The results lead to the conclusion that the sourgrass germination process tolerates low osmotic potentials and salinity levels. Despite being small sized seeds, they can emerge from high depths. These characteristics justify its occurrence in several regions and agroecosystems, especially in perennial and no-till crops lacking soil cover.
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水分限制、盐度和深度影响酸草的萌发和出苗
背景:由于酸草在农业生态系统中的存在,其种子传播能力促进了作物的大量损失。环境因素会影响酸草的萌发和出苗。目的:本研究的目的是确定水分限制、盐度和播种深度对酸草发芽和出苗过程的影响。方法:在模拟渗透、盐胁迫和播种深度的控制条件下,对酸草种子进行试验。收集到的数据进行方差分析,并通过回归分析调整到模型。结果:在-0.80 MPa时,渗透压越小,种子萌发率越低,正常种子萌发率越低,静止时间越长,种子萌发率越低。盐度降低了20 mM NaCl的萌发率,影响了正常、异常幼苗和静止种子的比例。种子深度影响幼苗出苗率,放置在基质表面的种子出苗率最高(83%)。酸草苗最大出苗深度为7.6 cm。结论:研究结果表明,酸草的萌发过程可以耐受低渗透电位和低盐度。尽管种子很小,但它们可以从深处钻出来。这些特征证明了它在一些地区和农业生态系统中,特别是在缺乏土壤覆盖的多年生和免耕作物中发生。
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来源期刊
Planta Daninha
Planta Daninha Agricultural and Biological Sciences-Plant Science
自引率
0.00%
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0
审稿时长
16 weeks
期刊介绍: Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.
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