The chromosome regions for increasing early growth in rice: role of sucrose biosynthesis and NH4+ uptake

Nagai, Yuki and Matsumoto, Kouichi and Kakinuma, Yuri and Ujiie, Kazuhiro and Ishimaru, Ken and Gamage, Dananjali M. and Thompson, Michael and Milham, Paul and Seneweera, Saman and Hirotsu, Naoki (2016) The chromosome regions for increasing early growth in rice: role of sucrose biosynthesis and NH4+ uptake. Euphytica, 211 (3). pp. 343-352. ISSN 0014-2336

Abstract

To elucidate the mechanism of plant growth we investigated chromosome region affecting traits (CRATs) using the chromosome segment substitution lines derived from a cross between japonica ‘Koshihikari’ and indica ‘Kasalath’ using rice (Oryza sativa L.). Four CRATs associated with increased plant growth rate were identified which were derived from ‘Kasalath’ alleles on chromosomes 1, 6, 8 and 12. This was achieved by evaluating the net dry weight gain from seed germination to 30 day-old seedlings. Physiological analysis of substitution lines containing a ‘Kasalath’ allele chromosome segment in the ‘Koshihikari’ background revealed that the CRAT on chromosome 1 (EGR1 ) increased the relative growth rate by increasing the net assimilation rate (NAR), and increased expression of the OsSPS1 gene that encodes the rate-limiting enzyme in sucrose synthesis. In contrast, CRATs on chromosomes 6, 8 and 12 (EGR6 , EGR8 and EGR12 ) were associated with an increased uptake of NH4+, the major nitrogen source for rice. These results suggest that early growth of rice is controlled by multiple traits and sucrose biosynthesis and NH4+ uptake play key roles.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 26 Jul 2016 04:15
Last Modified: 05 Sep 2017 02:34
Uncontrolled Keywords: Quantitative trait locus (QTL); rice; growth analysis; sucrose phosphate synthase; nitrogen uptake; seedling growth
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070305 Crop and Pasture Improvement (Selection and Breeding)
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070301 Agro-ecosystem Functionand Prediction
Socio-Economic Objective: D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960602 Eco-Verification (excl. Environmental Lifecycle Assessment)
Identification Number or DOI: 10.1007/s10681-016-1743-x
URI: http://eprints.usq.edu.au/id/eprint/29475

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