Abstract
A mapping population of IR24 (indica) chromosome segment substitution lines (CSSLsï€ ) in Asominori (japonica) background was used to detect quantitative trait loci (QTLs) for response to elevated CO2 in yield and its components of rice in free air CO2 enrichment (FACE, atmospheric CO2 plus 200 µmol CO2• mol-1) and natural atmospheric CO2 (Ambient) conditions. Transgressive segregation and continuous distribution in the CSSLs were observed for elevated CO2 response values (the value in FACE minus that in Ambient), in panicle number per plant (PN), grain number per panicle (GN), 1000 grain weight (GW) and yield per plant (YD), suggesting that all the tested traits responding to elevated CO2were quantitatively inherited. Three (qYD-1, qYD-10, qYD-12), two (qPN-5, qPN-10) and one (qGN-1) QTLs were detected for CO2 response to YD, PN and GN, respectively, but non-QTL for GW. Interestingly, both qYD-1 and qGN-1 were located at the same marker interval of C112-C2340, on chromosome 1, and had all positive response values from IR24. The results might be useful for understanding the genetic basis for responding to elevated CO2 and breeding new rice varieties adapted to the higher atmospheric CO2 environment in the future. Key words: Free air CO2 enrichment (FACE), quantitative trait loci (QTLs), rice (Oryza Sativa L.), yield and its component.
Highlights
Increasing atmospheric CO2 will bring about seriously global warming, which is expected to affect crop production
Transgressive segregation and continuous distribution in the chromosome segment substitution lines (CSSLs) were observed for elevated CO2 response values, in panicle number per plant (PN), grain number per panicle (GN), 1000 grain weight (GW) and yield per plant (YD), suggesting that all the tested traits responding to elevated CO2 were quantitatively inherited
Both qYD-1 and qGN-1 were located at the same marker interval of C112-C2340, on chromosome 1, and had all positive response values from IR24
Summary
Increasing atmospheric CO2 will bring about seriously global warming, which is expected to affect crop production. Free air CO2 enrichment (FACE) facilities are presently considered to be the best establishment for manipulating atmospheric CO2 concentration around plants growing under otherwise natural field conditions (Kobayashi, 2001; Holtum and Winte, 2003) Such system has become an integral tool for studying the effects of increasing CO2 concentration on the growth and development of plants. Though there were several reports on the use of molecular markers to map major genes or quantitative trait loci (QTLs) associated with yield and its components in rice under various natural conditions (Boonjung and Fukai, 1996; Moncada et al, 2001; Venuprasad et al, 2002; Hittalmani et al, 2003; Lanceras et al, 2004; Zhang et al, 2004), to the best of our knowledge, mapping of QTLs associated with elevated CO2 response in rice has not been conducted yet. This is the first report on the identification of QTLs for elevated CO2 responses with regard to yield and its components and their chromosomal localization on the molecular map of rice
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