Chlorophyll biosynthesis and transcriptome profiles of chlorophyll b-deficient type 2b rice (Oryza sativa L.)


  • Minh Khiem NGUYEN Biodiversity Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan Normal University, Taipei 115 (TW)
  • Chi-Ming Yang Biodiversity Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan Normal University, Taipei 115 (TW)
  • Tin-Han SHIH Biodiversity Research Center, Academia Sinica, Nangang, Taipei 115 (TW)
  • Szu-Hsien LIN Biodiversity Research Center, Academia Sinica, Nangang, Taipei 115 (TW)
  • Giang Tuyet PHAM Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000 (VN)
  • Hoang Chinh NGUYEN Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000 (VN)



chl b-deficient mutant, chlorophyll, gene expression, photosynthesis, transcriptome profiles


Photosynthetic and transcriptomic characteristics of a chlorophyll (Chl) b-deficient mutant type 2b rice (ch14) were investigated in this study. The ultrastructure of chloroplast in ch14 demonstrated irregular chloroplast enhancement (loss of starch granules, indistinct membranes, and thinner grana). Ch14 had significantly lower carotenoid, Chl a, Chl b, and total Chl contents, but a higher ratio of Chl a to Chl b than a wide-type rice. 3,594 genes were differentially expressed in ch14, among which 309 transcription factors were related to Chl degradation and biosynthesis, chloroplast formations, and the photosynthesis capacity. PsbR, GSA-AT, PBGD, PPOX, MgMT, and POR genes were down-regulated, reducing Chl content and photosynthetic capacity in the ch14. This study suggests that Chl degradation may be attributed to abnormal chloroplast development and down-regulation of gene expression in the common pathway and Mg branch and the rise in Chl a to Chl b ratio may be involved in the alternative Chl b degradation pathway.


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How to Cite

NGUYEN, M. K., Yang, C.-M., SHIH, T.-H., LIN, S.-H., PHAM, G. T., & NGUYEN, H. C. (2021). Chlorophyll biosynthesis and transcriptome profiles of chlorophyll b-deficient type 2b rice (Oryza sativa L.). Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 49(3), 12380.



Research Articles
DOI: 10.15835/nbha49312380

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