Yield Response of Upland NERICAs under Rain-fed Upland Conditions with Different Levels of Nitrogen Application

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
45-03-01.pdf555.41 KB

NERICAs (New Rice for Africa), new genotypes produced from the interspecific hybridization of Oryza sativa and O. glaberrima, have been bred in an attempt to improve the yield potential of rice cultivars adapted to resource-limited conditions in Africa. Identification of physiological traits responsible for their high-yielding potential under such conditions should be useful for rice-breeding programs to be employed not only in Africa but in other regions where rice production is being undertaken under low input conditions. In a series of experiments, we evaluated the growth and yield performance of upland NERICAs under rain-fed upland conditions with two levels of nitrogen application in comparison with Japanese elite rice cultivars, and attempted to identify the physiological traits responsible for the superior yield, if any. The upland NERICAs (NERICA 1 and NERICA 5) exhibited greater biomass production and yield than Japanese cultivars. The NERICAs also showed a higher rate of transpiration and exudation during the ripening stage, compared with elite Japanese cultivars. These results suggested that the greater water uptake ability of NERICAs appeared to be associated with their high N uptake capability, leading to greater biomass production and yield under water- and N-limited ecosystems. Further studies are needed to identify the specific root morphology involved in the water uptake ability of NERICAs.



N uptake


公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 243
終了ページ 249
DOI 10.6090/jarq.45.243
権利 Japan International Research Center for Agricultural Sciences
言語 eng