Seed enhancements to improve spinach germination
Seed enhancements to improve spinach germination
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DOI：
10.21273/hortsci.36.5.979
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发表时间：
2001-08-01
期刊：
影响因子：
1.9
通讯作者：
Langhans, RW
中科院分区：
文献类型：
--
作者：
Katzman, LS;Taylor, AG;Langhans, RW
快速、同步和高发芽率是利用水培技术生产商业菠菜（Spinacia oleracea L.）的要求。对种子萌发有促进作用的处理有：1)脱水处理；2)水中浸出；3) 0.5% NaOCl浸泡4小时，水洗15小时，0.3% H2O2播种（此处理称为NaOCl/H2O2）。在恒定的18℃（最佳）或30℃（抑制）条件下，对四个品种进行了发芽研究。在18℃条件下，两种水化处理的种子发芽率（T-50）均最大，但脱水后的种子萌发均匀性（t -delta）最高；所有处理的最终发芽率均大于或等于9%。在30度时，脱水使种子萌发最均匀。NaOCl/H2O2处理在高温下的发芽率最高（94%），而脱水处理的发芽率最低（69%）。脱水种子的萌发率降低是由于非典型萌发。不同品种对两种温度处理的反应不同。以两个发芽较慢的品种为研究对象，研究了NaOCl/H2O2处理的成分分析。加NaOCl或不加NaOCl的H2O2处理提高了两个品种的种子发芽率、均匀性和发芽率，但NaOCl单独处理没有效果。去除果皮或去除果皮加NaOCl H2O2处理在30℃下降低了萌发时间的变异性，提高了萌发速度，但脱皮产生的非典型幼苗比例高于其他处理。因此，对于无法维持较低发芽温度和/或无法负担冷却费用的种植者，建议使用NaOCl/H2O2处理。如果种植者能保持大约18度的发芽温度，基于萌发的高度均匀性，脱壳种子是可取的。
Rapid, synchronized, and high percentage of germination is required for commercial spinach (Spinacia oleracea L.) production using hydroponic techniques. Seed treatments examined to improve seed germination were: 1) decoating; 2) leaching in water; and 3) soaking seeds for 4 hours in 0.5% NaOCl, leaching for 15 hours in water, and sowing in 0.3% H2O2 (this treatment will be referred to as NaOCl/H2O2). Germination studies were conducted on four cultivars at a constant 18 degreesC (optimal) or 30 degreesC (inhibitory). At 18 degreesC, germination rate (T-50) was maximized by both hydration treatments, but uniformity of germination (T-deltad) was greatest for decoated seeds; final germination was greater than or equal to9% for all treatments. At 30 degreesC, decoating resulted in greatest uniformity of germination. The NaOCl/H2O2 treatment resulted in highest germination (94%) at the high temperature, whereas decoating was least effective (69%). Reduced germination of decoated seeds was attributed to atypical germinants. Cultivars differed in response to the treatments at both temperatures. Component analysis of the NaOCl/H2O2 treatment was studied with two slow-to-germinate cultivars. Treatment with H2O2, with or without NaOCl, improved the rate, uniformity, and percentage of germination of seeds of both cultivars, but NaOCl alone did not. Pericarp removal or pericarp removal plus NaOCl H2O2 treatments reduced variability in germination time and enhanced speed of germination at 30 degreesC, but decoating produced a higher percentage of atypical seedlings than did other treatments. Therefore, the NaOCl/H2O2 treatment is recommended for growers who are unable to maintain cool germination temperatures and/or cannot afford the costs associated with cooling. If growers can maintain a germination temperature of approximate to 18 degreesC, decoated seeds are preferable, based on the high uniformity of germination.