Effects of Light Quality on the Chlorophyll Degradation Pathway in Rice Seedling Leaves

  • Chang-Chang CHEN Miaoli District Agricultural Research and Extension Station, Council of Agriculture, Guannan, Kungkuan township 36346, Miaoli County, Taiwan
  • Kuan-Hung LIN Department of Horticulture and Biotechnology, Chinese Culture University, 11114 Taipei, Taiwan
  • Meng-Yuan HUANG Department of Horticulture and Biotechnology, Chinese Culture University, 11114 Taipei, Taiwan
  • Wen-Dar HUANG Department of Agronomy, National Taiwan University, Daan 10617, Taipei, Taiwan
  • Chi-Ming YANG Biodiversity Research Center, Academia Sinica, Nankang 11529, Taipei, Taiwan
Keywords: biosynthesis and degradation pathways; light quality; rice

Abstract

The objective of this study was to investigate the dynamics of chlorophyll (Chl), biosynthetic intermediates (protoporphyrin IX, magnesium protoporphyrin IX, and protochlorophyllide), degradation intermediates [chlorophyllide (Chlide), pheophytin (Phe), and pheophorbide (Pho)], and carotenoids (Car) in leaves of rice seedlings. Two rice varieties, 'Taichung Shen 10' ('TCS10') and 'IR1552', were grown under different light quality conditions controlled by light emitting diodes (LED). Lighting treatments for rice seedlings were included by red (R), blue (B), green (G), and red + blue (RB), with fluorescent lighting (FL) as the control and photosynthetic photon flux density being set at 105 µmol m-2 s-1. The results show that lower levels of Chl and Car in leaves were detected under G lighting, and light quality did not mediate porphyrins in biosynthetic pathways. Rice seedling leaves took Chl→Phe→Pho and Chl→Chlide→Pho as the major and minor degradation routes, respectively. Furthermore, higher Phe/Chlide ratios were observed under G and FL lighting conditions, indicating that green-enriched environments can up-regulate the minor degradation route in leaves.

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Published
2016-12-14
How to Cite
CHEN, C.-C., LIN, K.-H., HUANG, M.-Y., HUANG, W.-D., & YANG, C.-M. (2016). Effects of Light Quality on the Chlorophyll Degradation Pathway in Rice Seedling Leaves. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 44(2), 393-398. https://doi.org/10.15835/nbha44210555
Section
Research Articles