Effects of CO2 enrichment and spikelet removal on rice quality under open-air field conditions
Effects of CO2 enrichment and spikelet removal on rice quality under open-air field conditions
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露天条件下CO2富集和去穗对稻米品质的影响
DOI：
10.1016/s2095-3119(15)61245-x
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发表时间：
2016-01-01
影响因子：
4.8
通讯作者：
Yang Lian-xin
中科院分区：
文献类型：
--
作者：
Jing Li-quan;Wu Yan-zhen;Yang Lian-xin
大气二氧化碳（CO2）浓度的增加对稻米的多种品质性状产生不利影响，但其生化机制尚不清楚。本研究的目的是确定源库关系的变化如何影响稻米品质。以粳稻品种乌云粳23为对象，通过从分蘖到成熟期间自由空气富集CO2并在花期去除部分小穗，实现了源库调控。富集CO2降低了精米率和精米蛋白质浓度，但增加了籽粒的垩白度。相比之下，去除小穗导致整精米百分比和蛋白质浓度显着增加，并且谷物的垩白度大大降低。 CO2 富集和小穗去除均不影响淀粉含量，但淀粉颗粒尺寸的分布显示出明显的处理效果。平均而言，小穗去除使直径 >10 和 5-10 μm 的淀粉颗粒百分比分别降低了 23.6% 和 5.6%，增加了直径 2-5 和 5 μm 的淀粉颗粒百分比，并降低了
The increase of atmospheric carbon dioxide (CO2) concentration adversely affect several quality traits of rice grains, but the biochemical mechanism remains unclear. The objectives of this study were to determine how changes in the source-sink relationship affected rice quality. Source-sink manipulation was achieved by free-air CO2 enrichment from tillering to maturity and partial removal of spikelet at anthesis using a japonica rice cultivar Wuyunjing 23. Enrichment with CO2 decreased the head rice percentage and protein concentration of milled rice, but increased the grain chalkiness. In contrast, spikelet removal resulted in a dramatic increase in the head rice percentage and protein concentration, and much less grain chalkiness. Neither CO2 enrichment nor spikelet removal affected the starch content, but the distribution of starch granule size showed distinct treatment effects. On average, spikelet removal decreased the percentage of starch granules of diameter >10 and 5-10 mu m by 23.6 and 5.6%, respectively, and increased those with a diameter of 2-5 and 5 mu m) and decreasing that of