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Transcription profile analysis of chlorophyll biosynthesis in leaves of wild-type and chlorophyll b-deficient rice (Oryza sativa L.)

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journal contribution
posted on 2021-01-01, 00:00 authored by M K Nguyen, T H Shih, S H Lin, J W Lin, Hoang Chinh NguyenHoang Chinh Nguyen, Z W Yang, C M Yang
Photosynthesis is an essential biological process and a key approach for raising crop yield. However, photosynthesis in rice is not fully investigated. This study reported the photosynthetic properties and transcriptomic profiles of chlorophyll (Chl) b-deficient mutant (ch11) and wild-type rice (Oryza sativa L.). Chl b-deficient rice revealed irregular chloroplast development (indistinct membranes, loss of starch granules, thinner grana, and numerous plastoglobuli). Next-generation sequencing approach application revealed that the differential expressed genes were related to photosynthesis machinery, Chl-biosynthesis, and degradation pathway in ch11. Two genes encoding PsbR (PSII core protein), FtsZ1, and PetH genes, were found to be down-regulated. The expression of the FtsZ1 and PetH genes resulted in disrupted chloroplast cell division and electron flow, respectively, consequently reducing Chl accumulation and the photosynthetic capacity of Chl b-deficient rice. Furthermore, this study found the up-regulated expression of the GluRS gene, whereas the POR gene was down-regulated in the Chl biosynthesis and degradation pathways. The results obtained from RT-qPCR analyses were generally consistent with those of transcription analysis, with the exception of the finding that MgCH genes were up-regulated which enhance the important intermediate products in the Mg branch of Chl biosynthesis. These results indicate a reduction in the accumulation of both Chl a and Chl b. This study suggested that a decline in Chl accumulation is caused by irregular chloroplast formation and down-regulation of POR genes; and Chl b might be degraded via the pheophorbide b pathway, which requires further elucidation.

History

Journal

Agriculture

Volume

11

Issue

5

Article number

401

Pagination

1 - 17

Publisher

MDPI

Location

Basel, Switzerland

ISSN

2077-0472

eISSN

2077-0472

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal