中国生态农业学报Issue(4)：425-431,7.DOI:10.13930/j.cnki.cjea.141258
FACE条件下水稻生育后期剑叶光合色素含量及产量构成的响应研究
Responses of flag-leaf photosynthetic pigments at late growth stage and rice yield components to elevated CO2 under FACE system
摘要
Abstract
To verify the effects of elevated atmospheric CO2 concentration on photosynthetic capacity of rice leaves, the trend in photosynthetic pigments contents of flag-leaves at late growth stage and yield components of rice varieties of ‘Songjing9’ and‘Daohuaxiang2’ were studied under the free-air CO2 enrichment (FACE) system. Flag-leaf chlorophyll-a, chlorophyll-b and carotenoid contents were measured during booting and heading stages and yield components measured after harvest. The total chlorophyll content and the ratio of chlorophyll-a to chlorophyll-b were calculated and the correlations among yield components analyzed. The results showed that comparing to ABM (ambient CO2) treatment, FACE treatment increased chlorophyll-a contents in flag-leaves of both rice varieties at booting to heading stage with respective peak increasing values of 28.46% and 19.58%, and decreased by 15.25% and 23.20% at 20 d after heading stage. FACE treatment decreased chlorophyll-b contents of flag-leaves of both rice varieties by 7.57%and 5.33%at 20 d after heading stage, then increased at respective rates of 4.19%and 9.46%at 30 d after heading stage. Carotenoid contents in flag-leaves of both rice varieties noticeably increased respectively by 9.47% and 13.55% at heading stage under FACE treatment and then decreased at 10 d after heading stage at rates of 13.54%and 16.67%. The trends in the effects of elevated CO2 concentration on total chlorophyll content and chlorophyll-a <br> to chlorophyll-b ratio of flag-leaf were similar. The trends increased from booting to heading stage and then decreased at 20 d after heading stage. Elevated CO2 concentration was beneficial to yield components by increasing spike number per unit area, seed-setting rate and 1000-grain weight. The 1000-grain weight was increased by 8.6% and 4.5% of the two varieties, respectively. The results suggested that while elevated atmospheric CO2 concentration enhanced photosynthetic pigment accumulation in flag-leaves of rice at booting and heading stages, it inhibited photosynthetic pigment accumulation after heading stage. Photosynthetic pigments of flag-leaves of different varieties of rice had different degrees of responses to elevated atmospheric CO2 concentration. Increased 1000-grain weight was the key factor for yield increase of rice under elevated atmospheric CO2 concentration.关键词
FACE/水稻/剑叶/叶绿素/类胡萝卜素/产量构成Key words
FACE/Rice/Flag-leaf/Chlorophyll/Carotenoid/Yield component分类
农业科技引用本文复制引用
谢立勇,孙雪,赵洪亮,冯永祥,姜乐..FACE条件下水稻生育后期剑叶光合色素含量及产量构成的响应研究[J].中国生态农业学报,2015,(4):425-431,7.基金项目
国家自然科学基金项目(41175097)资助 （41175097）
