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Journal of Plant Biochemistry and Biotechnology

, Volume 28, Issue 4, pp 470–482 | Cite as

Genetically engineered rice with appA gene enhanced phosphorus and minerals

  • Sananda Bhattacharya
  • Shinjini Sengupta
  • Aritra Karmakar
  • Sailendra Nath Sarkar
  • Gaurab Gangopadhyay
  • Karabi Datta
  • Swapan Kumar DattaEmail author
Original Article
  • 65 Downloads

Abstract

Phytic acid is the major source of phosphorus and other mineral bound compounds in many plant tissues especially seeds and bran of cereals. During germination, phytase enzyme degrades phytic acid and bound phosphate and minerals are released. The monogastric animal cannot digest phytate due to lack of the phytase enzyme. Considering that, we have generated low phytate rice by over expressing appA gene cloned from E. coli under the aleurone-specific promoter of maize zein gene. Molecular analysis confirmed the stable integration of transgene and plants were grown up to T3 generation. The T3 seeds showed around 45% decrease in seed phytate content with a fourfold increase of inorganic phosphorus (Pi) level. The enhanced iron and zinc was twofold and threefold respectively in polished seeds of transgenic plants. There was no change in germination behaviour and other morphological traits in transgenic seeds. Thus, this result provides evidence that tissue-specific expression of bacterial phytase can lead to the reduction of phytic acid in rice seeds without hampering its other physiological processes and phenotypic cost.

Keywords

appA phytase Mineral fortification Phytic acid Transgenic rice 

Abbreviations

appA

Apoplastic periplasmic protein A

imp

Inositol mono phosphatase

itpk

Inositol 1,3,4 trisphosphate 5/6 kinase

ipk1

Inositol 1,3,4,5,6 pentakisphosphate 2-kinase

mips

Myo-inositol phosphate synthase

lpa

Low phytic acid

Notes

Acknowledgements

We are thankful to ICAR (Sanction No. DRR/CRP/Biofortification/2015) and DBT, (Sanction number: BT/PR12656/COE/34/22/2015) for the financial support. Ms. Sayani Majumdar for laboratory assistance, Mr. Pratap Ghosh and Mr. Sujoy Mondal for greenhouse work are duly acknowledged. We also acknowledge Mr. Rahul Bezbaruah, Scientific Officer (Chemical), National Test House, Govt. of India, Kolkata, for his assistance in analysis of myo-inositol through GC–MS.

Author contributions

SB designed and performed the experiments, wrote manuscript, prepared figures and tables. SSG and AK helped PCR screening. SNS guided in AAS experiment and helped in manuscript editing. GG helped in analysing the data, guided in experiments and helped in manuscript preparation. SKD and KD designed and supervised all the experiments, provided materials and revised the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

13562_2019_505_MOESM1_ESM.docx (5.1 mb)
Supplementary material 1 (DOCX 5180 kb)

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Copyright information

© Society for Plant Biochemistry and Biotechnology 2019

Authors and Affiliations

  1. 1.Department of Botany, Annex Building IIUniversity of CalcuttaKolkataIndia
  2. 2.Division of Plant BiologyBose Institute (Main Campus)KolkataIndia

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