Open AccessQuantitative trait loci for large sink capacity enhance rice grain yield under free-air CO2 enrichment conditions
Author(s) -
Hiroshi Nakano,
Satoshi Yoshinaga,
Toshiyuki Takai,
Yumiko AraiSanoh,
Katsuhiko Kondo,
Tetsuro Yamamoto,
Hidemitsu Sakai,
Takeshi Tokida,
Yasuhiro Usui,
Hirofumi Nakamura,
Toshihiro Hasegawa,
Motohiko Kondo
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-017-01690-8
Subject(s) - sink (geography) , panicle , oryza sativa , avena , grain yield , agronomy , cultivar , trait , yield (engineering) , chemistry , biology , materials science , gene , biochemistry , geography , cartography , computer science , metallurgy , programming language
The global atmospheric CO 2 concentration has been increasing annually. To determine the trait that effectively increases rice ( Oryza sativa L.) grain yield under increased atmospheric CO 2 concentrations, as predicted in the near future, we grew a chromosome segment substitution line (CSSL) and a near-isogenic line (NIL) producing high spikelet numbers per panicle (CSSL- GN1 and NIL- APO1 , respectively) under free-air CO 2 enrichment (FACE) conditions and examined the effects of a large sink capacity on grain yield, its components, and growth-related traits under increased atmospheric CO 2 concentrations. Under ambient conditions, CSSL- GN1 and NIL- APO1 exhibited a similar grain yield to Koshihikari, as a result of the trade-off between increased spikelet number and reduced grain filling. However, under FACE conditions, CSSL- GN1 and NIL- APO1 had an equal or a higher grain yield than Koshihikari because of the higher number of spikelets and lower reduction in grain filling. Thus, the improvement of source activity by increased atmospheric CO 2 concentrations can lead to enhanced grain yield in rice lines that have a large sink capacity. Therefore, introducing alleles that increase sink capacity into conventional varieties represents a strategy that can be used to develop high-yielding varieties under increased atmospheric CO 2 concentrations, such as those predicted in the near future.