Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light
Growth, Water-Use Efficiency, Stomatal Conductance, and Nitrogen Uptake of Two Lettuce Cultivars Grown under Different Percentages of Blue and Red Light
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DOI：
10.3390/horticulturae4030016
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发表时间：
2018-09-01
期刊：
影响因子：
3.1
通讯作者：
Gomez, Celina
中科院分区：
文献类型：
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作者：
Clavijo-Herrera, Jonathan;van Santen, Edzard;Gomez, Celina
本研究的目的是表征在不同百分比的蓝光和红光下生长的两个生菜品种的生长、水分利用效率 (WUE)、气孔导度 (g(s))、SPAD 指数值和芽氮吸收量。评估的处理为 100% 红色； 7%蓝色+93%红色； 26%蓝色+74%红色； 42%蓝色+58%红色； 66%蓝色+34%红色；和 100% 蓝色。使用广谱（19% 蓝色、43% 绿色和 38% 红色）光来观察波长相互作用的影响。所有处理提供的平均日光积分 (DLI) 为 17.5 mol.m(-2).d(-1)（18 小时光周期内为 270 +/- 5 mu mol.m(-2).s(-1)）。随着时间的推移，该实验被重复了 3 次；每个治疗开始后 21 天终止。叶面积、比叶面积 (SLA) 和 SPAD 指数具有相似的响应，即所有参数在蓝光高达 66% 时均增加，而在蓝光 100% 时略有下降或保持不变。相比之下，蓝光的影响下，叶片数量、茎干质量和 WUE 普遍下降。相反，蓝光每增加 10%，g(s) 就会增加 10 mmol.m(-2).s(-1)。氮的吸收不受光质量的影响。我们的研究结果表明，当在不同的蓝色和红色光子通量比下生长时，生菜的WUE在较高蓝光下显着降低，这可能归因于植物生长（叶子数量和干质量）的减少以及g（s）的增加。然而，广谱灯内的绿光可能会抵消蓝光介导的对生菜 g(s) 和 WUE 的影响。
The objective of this study was to characterize growth, water-use efficiency (WUE), stomatal conductance (g(s)), SPAD index values, and shoot nitrogen uptake of two lettuce cultivars grown under different percentages of blue and red light. The treatments evaluated were 100% red; 7% blue + 93% red; 26% blue + 74% red; 42% blue + 58% red; 66% blue + 34% red; and 100% blue. Broad-spectrum (19% blue, 43% green, and 38% red) light was used to observe the effects of wavelength interactions. All of the treatments provided an average daily light integral (DLI) of 17.5 mol.m(-2).d(-1) (270 +/- 5 mu mol.m(-2).s(-1) over an 18-h photoperiod). The experiment was replicated three times over time; each terminated 21 days after treatment initiation. Leaf area, specific leaf area (SLA), and SPAD index had a similar response in that all of the parameters increased with up to 66% blue light, and slightly decreased or remained constant with 100% blue light. In contrast, leaf number, shoot dry mass, and WUE generally decreased in response to blue light. Conversely, for every 10% increase in blue light, g(s) increased by 10 mmol.m(-2).s(-1). Nitrogen uptake was unaffected by light quality. Our findings indicate that when grown under different blue and red photon flux ratios, the WUE of lettuce significantly decreases under higher blue light, which could be attributed to a reduction in plant growth (leaf number and dry mass), and an increase in g(s). However, green light within broad-spectrum lamps might counteract blue-light mediated effects on g(s) and WUE in lettuce.