The effect of nitrogen application level on photosynthetic traits in the AA genome wild rice species, Oryza nivara: A comparison with the Oryza sativa japonica cultivar, Nipponbare

Norimitsu Hamaoka, Ueno Osamu

Research output: Contribution to journalArticle

Abstract

The optimization of nitrogen (N) application level and the development of cultivars with high physiological N use efficiency (NUE) are needed to establish a sustainable rice cropping system. In our previous study, we found that a strain of wild rice species Oryza nivara (IRGC105715; NVR) shows high NUE under low N conditions. In this study we investigated photosynthetic traits of NVR in comparison with the O. sativa japonica cultivar Nipponbare. Plants were water-cultured under three N conditions; standard N (1N), medium N (1/2N) and low N (1/4N) levels. At the vegetative stage, leaves of NVR showed a higher photosynthetic rate, stomatal conductance (Gs) and CO2fixation activity than those of Nipponbare under 1/2N and 1/4N conditions. NVR also showed higher maximum quantum yield of photosystem II than Nipponbare under 1/4N condition. NVR tended to have higher specific leaf weight and leaf N content than Nipponbare. Under 1/2N and 1/4N conditions, NVR exhibited higher photosynthetic N use efficiency (PNUE) than Nipponbare. These data demonstrate that NVR have higher photosynthetic capacity and PNUE than Nipponbare under low N conditions. These traits may be attributed to the maintenance of higher Gs, photochemical activity and leaf N content under a low N condition in NVR. It is suggested that the photosynthetic properties of NVR may be a promising genetic trait for breeding of cultivars suitable for low N-input agriculture.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalJapanese Journal of Crop Science
Volume83
Issue number4
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

Oryza nivara
wild rice
Oryza sativa
Nitrogen
Genome
genome
cultivars
nitrogen
leaves
genetic traits
Photosystem II Protein Complex
Agriculture
photosystem II
Breeding
vegetative growth
stomatal conductance
cropping systems
agriculture
Weights and Measures
rice

All Science Journal Classification (ASJC) codes

  • Food Science
  • Agronomy and Crop Science
  • Genetics

Cite this

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abstract = "The optimization of nitrogen (N) application level and the development of cultivars with high physiological N use efficiency (NUE) are needed to establish a sustainable rice cropping system. In our previous study, we found that a strain of wild rice species Oryza nivara (IRGC105715; NVR) shows high NUE under low N conditions. In this study we investigated photosynthetic traits of NVR in comparison with the O. sativa japonica cultivar Nipponbare. Plants were water-cultured under three N conditions; standard N (1N), medium N (1/2N) and low N (1/4N) levels. At the vegetative stage, leaves of NVR showed a higher photosynthetic rate, stomatal conductance (Gs) and CO2fixation activity than those of Nipponbare under 1/2N and 1/4N conditions. NVR also showed higher maximum quantum yield of photosystem II than Nipponbare under 1/4N condition. NVR tended to have higher specific leaf weight and leaf N content than Nipponbare. Under 1/2N and 1/4N conditions, NVR exhibited higher photosynthetic N use efficiency (PNUE) than Nipponbare. These data demonstrate that NVR have higher photosynthetic capacity and PNUE than Nipponbare under low N conditions. These traits may be attributed to the maintenance of higher Gs, photochemical activity and leaf N content under a low N condition in NVR. It is suggested that the photosynthetic properties of NVR may be a promising genetic trait for breeding of cultivars suitable for low N-input agriculture.",
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