Abstract：
Whether green light promotes or represses plant growth is an unresolved but important question, warranting a global meta-analysis of published data. We collected 136 datasets from 48 publications on 17 crop species, and calculated the green light effect for a range of plant traits. For each trait the effect was calculated as the ratio between the trait value attained under a red/blue background light plus green, divided by the value attained under the background light only, both having the same light intensity. Generally, green light strongly increased intrinsic water use efficiency (15%), the shoot-to-root ratio (13%), and decreased stomatal conductance (-15%). Moreover, green light increased fresh weight to a small extent (4%), but not plant dry weight, resulting in a reduced dry matter content (-2%). Hence, green light is similarly effective at increasing biomass as red and blue light. Green light also showed to increase leaf area (7%) and specific leaf area (4%; i.e., thinner leaves). Furthermore, effects of green light were species-dependent, with positive effects on biomass for lettuce and microgreens, and negative effects in basil and tomato. Our data suggest that future research should focus on the role of green light in modulating water loss, its putative role as a shade signal, and the causes for its species-specific effects on crop biomass.
摘要：
绿光是否促进或抑制植物生长是一个尚未解决但重要的问题，保证对已发布数据进行全球荟萃分析。我们从48种出版物中收集了关于17种作物的136个数据集，并计算了一系列植物性状的绿光效应。对于每个性状，效果计算为在红色/蓝色背景光下获得的性状值与绿色之间的比率，除以仅在背景光下获得的值，两者具有相同的光强度。一般来说,绿灯大大提高了内在用水效率(15%)，芽根比(13%)，气孔导度降低（-15％）。此外，绿光在很小程度上增加了鲜重（4％），但不是植物干重，导致干物质含量降低(-2%)。因此，绿光在增加生物量方面与红光和蓝光同样有效。绿光还显示增加叶面积（7％）和比叶面积（4％；即较薄的叶子）。此外，绿光的影响取决于物种，对生菜和微绿的生物量有积极影响，以及罗勒和番茄的负面影响。我们的数据表明，未来的研究应该集中在绿光在调节水分流失中的作用。它作为阴影信号的假定作用，以及其对作物生物量的物种特异性影响的原因。
