利用FACE ( Free air CO2 enrichment)试验平台,选取北方主栽品种松粳9号和稻花香2号为试材,研究CO2浓度增高(600μmol/mol)对不同水稻品种籽粒灌浆特性的影响。在FACE条件下,松粳9号的籽粒最大灌浆速率增幅为18.0%,平均灌浆速率增幅为17.6%,灌浆前期延长0.88 d,灌浆中期和后期缩短了2.04,1.44 d,总灌浆时间缩短2.60 d。稻花香2号经过FACE处理后到达最大灌浆速率的时间比对照晚4.27 d,并且最大灌浆速率低于对照6．8%,平均灌浆速率低于对照7.7%,灌浆前期比对照延长2.45 d,中期延长3.63 d,后期延长2.56 d。千粒质量和籽粒灌浆参数的相关性分析表明,粒重和灌浆速率的关系更为密切。说明不同水稻品种的灌浆特性对CO2浓度升高的响应存在差异,松粳9号的主要响应方式是灌浆速率的提高,而稻花香2号则是灌浆持续时间的延长。%Effects of elevated (600μmol/mol) CO2 concentration on grain-filling characteristics of different ja-ponica rice cultivars were investigated using Songjing 9 and Daohuaxiang 2 by mini FACE ( Free air CO2 enrich-ment) experimental platform. In blossom,we Chose 100 stalks and put a notice plate with date on each one. From five days after blossom,each treatment was randomly taken 5 to 8 tassels,sampling time in the morning 10-12,a total of five times. After sampling 105 ℃ heating 30 min,then 70 ℃ drying to constant weight,get rid of the empty grain and ill grain,select 200 grains′weight converted into thousand-grain weight. Using the logistic equation for the filling process of dynamic fitting analysis. The results showed that the maximum and average grain-filling rate of Songjing 9 was increased by 18% and 17. 6% under mini FACE. The duration of early grain-filling of Songjing 9 was prolonged for 0. 88 d,while the duration of total grain-filling was shortened by 2. 60 d under mini FACE. The day of maximum grain-filling rate of Daohuaxiang 2 was delayed for 4. 27 d,and the maximum and average grain-filling rate was decreased by 6. 8% and 7. 7%. The duration of early,middle and late grain-filling was prolonged for 2. 45,3. 63,2. 56 d. The results indicated that grain-filling characteristics of different rice varieties respond to ele-vated CO2 concentration difference. The filling rate of Songjing 9 will be quickly and the filling stage of Daohuaxiang 2 will be longer. The results of the study can improve and genetic improvement of rice cultivation measures to pro-vide certain theory reference and practice basis.
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