Genotypic variation in rice yield enhancement by elevated CO2 relates to growth before heading, and not to maturity group.
Genotypic variation in rice yield enhancement by elevated CO2 relates to growth before heading, and not to maturity group.
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DOI：
10.1093/jxb/ern288
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发表时间：
2009
影响因子：
6.9
通讯作者：
Hasegawa T
中科院分区：
文献类型：
--
作者：
Shimono H;Okada M;Yamakawa Y;Nakamura H;Kobayashi K;Hasegawa T
成熟期组（基于成熟天数）是决定作物生产力的重要生长性状，但目前还没有尝试研究CO2浓度升高对不同成熟期组水稻品种产量提高的影响。由于早熟品种一般表现出较高的植物氮浓度比晚熟品种，据推测，[CO2]诱导的产量提高可能是早熟品种比晚熟品种更大。为了验证这一假设，[CO2]浓度升高对产量构成因素，生物量，氮吸收，不同成熟度组的品种叶片光合作用的影响进行了研究2年使用自由空气CO2富集（FACE）。[CO2]浓度升高显著提高了籽粒产量，且[CO2]×品种互作效应在品种间差异显著。两个品种（一个与早期和一个与晚熟）更强烈地响应升高[CO2]比那些中间成熟，主要是由于小穗密度的增加。抽穗期生物量和吸氮量与籽粒产量、小穗密度和品种间存在密切相关。我们的2年田间试验拒绝了假设，即早期品种将响应更高的[CO2]比后来的品种，但它表明，抽穗前的生长增强的幅度是一个有用的标准，选择水稻品种能够适应高[CO2]。
Maturity group (based on the number of days to maturity) is an important growth trait for determining crop productivity, but there has been no attempt to examine the effects of elevated [CO2] on yield enhancement of rice cultivars with different maturity groups. Since early-maturing cultivars generally show higher plant N concentration than late-maturing cultivars, it is hypothesized that [CO2]-induced yield enhancement might be larger for early-maturing cultivars than late-maturing cultivars. To test this hypothesis, the effects of elevated [CO2] on yield components, biomass, N uptake, and leaf photosynthesis of cultivars with different maturity groups were examined for 2 years using a free-air CO2 enrichment (FACE). Elevated [CO2] significantly increased grain yield and the magnitude significantly differed among the cultivars as detected by a significant [CO2]×cultivar interaction. Two cultivars (one with early and one with late maturity) responded more strongly to elevated [CO2] than those with intermediate maturity, resulting mainly from increases in spikelet density. Biomass and N uptake at the heading stage were closely correlated with grain yield and spikelet density over [CO2] and cultivars. Our 2 year field trial rejected the hypothesis that earlier cultivars would respond more to elevated [CO2] than later cultivars, but it is revealed that the magnitude of the growth enhancement before heading is a useful criterion for selecting rice cultivars capable of adapting to elevated [CO2].
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