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    Development and field performance of nitrogen use efficient rice lines for Africa

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    Authors
    Selvaraj, Michael Gomez
    Valencia, Milton Orlando
    Ogawa, Satoshi
    Lu, Yingzhi
    Wu, Liying
    Downs, Christopher
    Skinner, Wayne
    Lu, Zhongjin
    Kridl, Jean C.
    Ishitani, Manabu
    Boxtel, Jos Van
    Date
    2017
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    Accessibility
    Open Access
    Metadata
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    Citation
    Gomez Selvaraj, Michael; Valencia, Milton Orlando; Ogawa, Satoshi; Lu, Yingzhi; Wu, Liying; Downs, Christopher; Skinner, Wayne; Lu, Zhongjin; Kridl, Jean C.; Ishitani, Manabu; Boxtel, Jos Van. 2017. Development and field performance of nitrogen use efficient rice lines for Africa . Plant Biotechnology Journal . Wiley-Blackwell Publishing Ltd., 15(6): 775-787
    Permanent link to cite or share this item: https://hdl.handle.net/10568/79451
    DOI: https://dx.doi.org/10.1111/pbi.12675
    Abstract/Description
    Nitrogen (N) fertilizers are a major input cost in rice production, and its excess application leads to major environmental pollution. Development of rice varieties with improved nitrogen use efficiency (NUE) is essential for sustainable agriculture. Here, we report the results of field evaluations of marker-free transgenic NERICA4 (New Rice for Africa 4) rice lines overexpressing barley alanine amino transferase (HvAlaAT) under the control of a rice stress-inducible promoter (pOsAnt1). Field evaluations over three growing seasons and two rice growing ecologies (lowland and upland) revealed that grain yield of pOsAnt1:HvAlaAT transgenic events was significantly higher than sibling nulls and wild-type controls under different N application rates. Our field results clearly demonstrated that this genetic modification can significantly increase the dry biomass and grain yield compared to controls under limited N supply. Increased yield in transgenic events was correlated with increased tiller and panicle number in the field, and evidence of early establishment of a vigorous root system in hydroponic growth. Our results suggest that expression of the HvAlaAT gene can improve NUE in rice without causing undesirable growth phenotypes. The NUE technology described in this article has the potential to significantly reduce the need for N fertilizer and simultaneously improve food security, augment farm economics and mitigate greenhouse gas emissions from the rice ecosystem.
    CGIAR Author ORCID iDs
    MICHAEL GOMEZ SELVARAJhttps://orcid.org/0000-0003-2394-0399
    Manabu Ishitanihttps://orcid.org/0000-0002-6950-4018
    CGIAR Affiliations
    Rice
    AGROVOC Keywords
    ORYZA SATIVA; RICE; ALANINE AMINOTRANSFERASE; FIELD EXPERIMENTATION; GRAIN; YIELD; TRANSGENICS; NITROGEN FERTILIZERS; TRANSFORMATION; ORYZA SATIVA; ARROZ; ALANINA AMINOTRANSFERASA; EXPERIMENTACIÓN EN CAMPO; GRANOS; RENDIMIENTO; TRANSGÉNICOS; ABONOS NITROGENADOS
    Subjects
    PLANT BREEDING; RICE;
    Regions
    AFRICA
    Collections
    • CIAT Agrobiodiversity [554]
    • CIAT Articles in Journals [2395]

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