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首页> 外文期刊>Environmental and experimental botany >Elongation growth mediated by blue light varies with light intensities and plant species: A comparison with red light in arugula and mustard seedlings
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Elongation growth mediated by blue light varies with light intensities and plant species: A comparison with red light in arugula and mustard seedlings

机译：由蓝光介导的伸长率生长随着光强度和植物种类而变化：与芝麻菜和芥末幼苗的红光进行比较

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摘要

Previous studies have indicated that at a photosynthetic photon flux density (PPFD) of 50 or 100 mu mol m(-2).s(-1), pure blue light, compared to red light, can promote plant elongation of de-etiolated seedlings for arugula, but not for mustard. The objective of this study was to investigate whether the promotion effect of blue light can also occur under wider range of PPFD levels. The growth and morphology traits of arugula (Brassica eruca, 'Rocket') and mustard (Brassica juncea, 'Ruby Streaks') seedlings were compared during the stage from seeding to cotyledon unfolding under two light quality x six light intensity treatments: (1) R, "pure" red light (665 nm); and (2) B, "pure" blue light (440 nm) using light-emitting diode lighting at PPFD levels of 20, 70, 120, 250, 450 and 650 mu mol m(-2).s(-1). Continuous (24-h light/0-h dark) lighting and an air temperature of approximately 22 degrees C was used for the above treatments. After 7 to 8 days of lighting treatment, regardless of species, B promoted hypocotyl and petiole elongation compared to R at certain PPFD levels, associated with some shade-avoidance responses such as reduced biomass partitioning to cotyledons, cotyledon size, and plant coloring, which varied between species. The blue light promotion effect on hypocotyl elongation was detected at all the tested PPFD levels for arugula, but at a narrower range of PPFD levels (i.e., 250-650 mu mol m(-2).s(-1)) for mustard. Also, for arugula, the hypocotyl promotion by blue light decreased with increased PPFD levels. Generally, the promotion effects of blue vs. red light were more obvious for arugula than mustard. This suggests that blue vs. red light can promote elongation growth of de-etiolated seedlings for arugula and mustard, but the promotion effects vary with light intensities and plant species.
机译：以前的研究表明，在50或100μmmolm（-2）的光合光子通量密度（ppfd），（-1），纯蓝光，与红光相比，可以促进植物伸长的去硫化幼苗对于芝麻菜，但不是芥末。本研究的目的是研究蓝光的促进效果是否也可能在更广泛的PPFD水平范围内发生。在从播种到三个光质质量x六光强度治疗中，将芝麻菜（Brassica Eruca，'Rocket'）和芥末（Brassica Juncea，'Rupy Strize'）幼苗进行比较：（1） r，“纯净”红灯（665 nm）; （2）B，“纯”蓝光（440nm）使用在PPFD水平的PPFD水平为20,70,120,250,450和650μmmolm（-2）的PPFd二极管照明。（-1）。连续（24-H光/ 0-H暗）照明和约22℃的空气温度用于上述处理。在照明治疗的7至8天后，无论物种，B在某些PPFD水平上相比，B促进了胚轴和叶柄伸长率，与某些阴影避免反应相关，例如将生物量减少到子叶，子叶大小和植物着色，这物种之间变化。在芝麻菜的所有测试PPFD水平中检测到对胚轴伸长的蓝光促进效果，但在芥末的PPFD水平较窄范围内（即250-650μmmmolm（-2））。此外，对于芝麻菜，蓝光的次琥珀促促促进随着PPFD水平的增加而降低。通常，蓝色与红光的促进效果比芥末更明显。这表明蓝色与红光可以促进芝麻菜和芥末的伸长率幼苗的伸长率生长，但促进效果随着光强度和植物种类而变化。

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