Abstract
To explore the presence and expression of the nifH gene of diazotrophic endophytes in sugarcane (Saccharum spp. hybrids) cv. NiF8, we conducted pot experiments for two seasons in a glasshouse from 10 June to 17 September (high temperature and long days) in 2005 and 1 September to 9 December (low temperature and short days) in 2006. The expression of nifH genes in the stems and roots of sugarcane plants at 50 (or 59) and 100 days after transplanting was investigated by reverse transcription (RT)–PCR and by examining the nifH nucleotide sequence diversity. N2 fixation was assessed by the 15N-dilution method. The nifH RNA sequences in the stems and roots of the first experiment were similar to those of Bradyrhizobium sp. and Azorhizobium caulinodans. In the second experiment, nifH expression from these bacteria was not detected in the stems. nifH gene expression in the stems was in accordance with 18–24% N derived from air in the high-temperature season and negligible in the low-temperature season. Both the proliferation of N2 fixers and expression of the nifH gene indicated that bacteria similar to rhizobia may contribute to N2 fixation in sugarcane under our experimental conditions.
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Abbreviations
- BNF:
-
Biological nitrogen fixation
- DAT:
-
Days after transplanting
- %Ndfa:
-
Percent nitrogen derived from air
- RT-PCR:
-
Reverse transcription-polymerase chain reaction
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Acknowledgments
We would like to thank Drs. Yasuhiro Nakanishi, Mitsunori Sato, Yoshifumi Terajima, and Makoto Matsuoka for supplying the sugarcane stems and soils from sugarcane fields. This study was partially supported by a research project on Development of New Biorational Techniques for Sustainable Agriculture of the Agriculture, Forestry and Fisheries Research Council, Japan, and by a research fund (B-1538047) from the Ministry of Education, Culture, Sports, Sciences and Technology, Japan.
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Responsible Editor: Euan K. James.
Nisarat Thaweenut and Yusuke Hachisuka contributed equally to this work.
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Thaweenut, N., Hachisuka, Y., Ando, S. et al. Two seasons’ study on nifH gene expression and nitrogen fixation by diazotrophic endophytes in sugarcane (Saccharum spp. hybrids): expression of nifH genes similar to those of rhizobia. Plant Soil 338, 435–449 (2011). https://doi.org/10.1007/s11104-010-0557-1
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DOI: https://doi.org/10.1007/s11104-010-0557-1