提高绿光占比对黄瓜幼苗形态、光合性状及碳水化合物的影响

Effect of increasing the percentage of green light on morphology,photosynthetic traits and carbohydrates of cucumber seedlings

为探究不同绿光占比对黄瓜幼苗形态、光合性状及碳水化合物的影响,遴选适宜黄瓜幼苗生长的最优绿光占比,以‘新津优1号’黄瓜为材料,在固定红蓝光比为4∶1及总光强200μmol/(m^(2)·s)的基础上,设定绿光占比为10%(G10%)、20%(G20%)和30%(G30%),使其强度分别为60、40、20μmol/(m^(2)·s),研究不同绿光占比下黄瓜幼苗生长和生理指标的变化。结果表明:适宜范围内提高光质中绿光占比的比例可提高黄瓜幼苗鲜重及干重,G30%处理较G20%和G10%处理的鲜重分别增加了29.65%和29.26%。提高绿光占比降低了气孔孔隙面积,但增加了叶片气孔密度,G30%与G20%处理较G10%处理的孔隙面积显著降低了13.17%和23.05%,但G30%与G20%处理的气孔密度较G10%增加了20.22%和14.66%。提高绿光占比增加了叶片组织栅海比(P/S),G30%处理P/S值显著高于G20%与G10%处理。提高绿光占比可促进植物光合潜力,在光强为1000μmol/(m^(2)·s)的测定光源下,G30%处理的净光合速率较G10%显著提高77.37%。该研究结果为植物工厂化育苗及设施内补光提供依据和参考。

The aims of this study were to investigate the effects of different green light ratios on the morphology,photosynthetic traits and carbohydrates of cucumber seedlings and select the optimal green light ratio for the growth of cucumber seedlings.Based on the fixed red and blue light ratio of 4∶1 and total light intensity of 200μmol/(m^(2)·s),the green light ratios were set to 10%(G10%),20%(G20%)and 30%(G30%),and the intensities were 60,40 and 20μmol/(m^(2)·s)to study the changes of growth and physiological indexes of cucumber seedlings under different green light ratios.The results showed that:Increasing the proportion of green light iwithin the appropriate range promoted the fresh weight and dry weight of cucumber seedlings,and the fresh weight of G30%treatment were increased by 29.65%and 29.26%compared with those in G20%and G10%treatments,respectively.Increasing the percentage of green light decreased the stomatal pore area but increased the leaf stomatal density.The pore area of G30%and G20%treatments significantly decreased by 13.17%and 23.05%compared to those in G10%treatment,but the stomatal densities of G30%and G20%treatments increased by 20.22%and 14.66%compared to G10%.Increasing the green light percentage increased its leaf tissue grid-to-sea ratio(P/S),and the P/S values of G30%treatment were significantly higher than those of G20%and G10%treatments by 23.21%and 26.97%,respectively.Increasing the green light ratio also promoted the photosynthetic potential of plants,and the net photosynthetic rate of G30%treatment was significantly higher than that of G10%by 77.37%under the measured light intensity of 1000μmol/(m^(2)·s)measured light source.This study provides a basis and reference for plant plant nursery and supplemental light in facilities.