Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università di Perugia, Borgo XX Giugno, 74, 06121 Perugia, ITALIA.
J Agric Food Chem. 2020 Aug 19;68(33):8757-8763. doi: 10.1021/acs.jafc.0c03851. Epub 2020 Aug 5.
This work aimed to study the effect of some light spectra on the growth, oxidative state, and stress of einkorn wheatgrass ( L. ssp. ). To this end, six light treatments, having the same total incident photon flux density (PFD) of 200 μmol m s, were applied to einkorn and compared: only blue light; only red; three blue:red combinations, at different proportions of total PFD (75:25%, 50:50%, and 25:75%, respectively); and a wide spectrum, taken as a control treatment, composed of blue (18% of PFD), red (18%), and intermediate wavelengths (64%). Light treatments affected the contents of pigments (chlorophylls and carotenes), hydrogen peroxide (HO), and malondialdehyde (MDA). These results revealed the changes in the oxidative status of wheatgrass, in response to the different light treatments. However, the dichromatic light with blue ≥50% of the total PFD appeared to be the best combination, guarantying good wheatgrass yield, increasing pigment content, and reducing HO and MDA when compared to the other light treatments. Our findings also contribute to explaining the available literature on the effect of these kinds of light on the increase in phenolic compounds and antioxidant activity in einkorn wheatgrass.
本研究旨在探讨不同光谱光质对春小麦生长、氧化状态和胁迫的影响。为此，我们设置了 6 种光处理，每种光处理的总光量子通量密度（PFD）均为 200 μmol m s ，并将其与春小麦进行了比较：只包含蓝光；只包含红光；3 种不同红蓝比例（分别为 75:25%、50:50%和 25:75%）的红蓝组合光；以及一个以宽光谱作为对照的处理，其包含蓝（占 PFD 的 18%）、红（占 PFD 的 18%）和中波（占 PFD 的 64%）。光处理影响了春小麦的色素（叶绿素和类胡萝卜素）、过氧化氢（HO）和丙二醛（MDA）的含量。这些结果揭示了春小麦氧化状态的变化，以响应不同的光处理。然而，当与其他光处理相比时，具有≥50%总 PFD 的蓝双色光似乎是最佳组合，它保证了良好的春小麦产量，增加了色素含量，并降低了 HO 和 MDA 的含量。我们的研究结果也有助于解释有关这些光质对春小麦中酚类化合物和抗氧化活性增加的影响的现有文献。
