Oat Germination Characteristics Differ among Genotypes, Seed Sizes, and Osmotic Potentials
Oat Germination Characteristics Differ among Genotypes, Seed Sizes, and Osmotic Potentials
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DOI：
10.2135/cropsci2004.0722
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发表时间：
2005-09
期刊：
影响因子：
2.3
通讯作者：
C. Willenborg;Jeffery C. Wildeman;Aaron K. Miller;B. Rossnagel;S. Shirtliffe
中科院分区：
文献类型：
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作者：
C. Willenborg;Jeffery C. Wildeman;Aaron K. Miller;B. Rossnagel;S. Shirtliffe
燕麦（Avena sativa L.）北方大平原的产量和质量不断下降，频繁的干旱和野生燕麦（燕麦L.）竞争除草剂不能选择性地去除燕麦中的野燕麦。鉴定在水分胁迫下具有高发芽潜力的基因型或种子大小可能有助于提高幼苗活力、林分建立和作物竞争力。因此，进行了发芽研究，以确定基因型和种子大小的燕麦种子发芽受到水分胁迫的影响。将六种常见的加拿大西部燕麦基因型的大、中、小种子在5°C下初始渗透势为0至-0.4 MPa的聚乙二醇（PEG 8000）溶液中发芽。广义线性混合模型拟合的数据提供了一个统计上有效的，适当的，方便的方法来分析发芽数据。在所有的基因型检查，降低种子大小和渗透势增加中位发芽时间（MGT），降低最终发芽率（FGP）。在基因型中，CDC Bell的MGT最快，而AC Mustang的FGP最高。延迟MGT和减少FGP导致水分胁迫增加是类似于在其他谷物中观察到的，这表明燕麦可能是能够发芽的低春季土壤水分条件下，小麦和大麦。本研究的结果还表明，大种子的基因型，如AC野马和CDC贝尔似乎更适合发芽的渗透势范围内，在本研究中。尽管本研究中种子大小之间的MGT和FGP差异具有统计学显著性，但它们通常较小，因此，通过从农场保存的种子中筛选出小种子可能不会显著改善燕麦发芽特性。
Oat (Avena sativa L.) yield and quality on the northern Great Plains are consistently reduced by frequent drought and wild oat (Avena fatua L.) competition. Wild oat cannot be selectively removed from oat with herbicides. Identifying genotypes or seed size(s) with high germination potential under moisture stress may facilitate improved seedling vigor, stand establishment, and crop competitiveness. Therefore, a germination study was conducted to determine the effects of genotype and seed size on the germination of oat seed subjected to moisture stress. Large, medium, and small seeds of six common western Canadian oat genotypes were germinated in polyethylene glycol (PEG 8000) solutions with initial osmotic potentials ranging from 0 to -0.4 MPa at 5°C. Generalized linear mixed models fit to the data provided a statistically valid, appropriate, and convenient method to analyze germination data. In all genotypes examined, decreasing seed size and osmotic potential increased median germination time (MGT) and lowered final germination percentage (FGP). Among genotypes, CDC Bell had the fastest MGT while AC Mustang had the highest FGP. Delays in MGT and reductions in FGP resulting from increased moisture stress were similar to those observed in other cereals, suggesting that oat may be as capable of germinating under low spring soil moisture conditions as wheat and barley. The results of this study also indicate that large seed of genotypes such as AC Mustang and CDC Bell appear better suited to germinate under the range of osmotic potentials in this study. Although differences in MGT and FGP between seed sizes in this study were statistically significant, they were generally small and thus, oat germination characteristics may not be substantially improved by screening out small seed from farm-saved seed.