FACE对三系杂交籼稻汕优63根系生长动态的影响  

Effect of Free Air CO_2 Enrichment on Root Growth Dynamics of Indica Rice(Oryza sativa L.)Cultivar Shanyou 63

作　　者：刘红江[1] 杨连新[1] 黄建晔[1] 董桂春[1] 朱建国[2] 刘钢[2] 王余龙[1] 

机构地区：[1]扬州大学江苏省作物遗传生理重点实验室,江苏扬州225009 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《农业环境科学学报》2008年第6期2291-2296,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(30471013,30671226);国家自然科学基金重大国际合作研究项目(40120140817);中国科学院知识创新重要方向项目(KSCX3-SW-440)

摘　　要：CO2浓度增高影响水稻生长。2005、2006年利用我国惟一的农田开放式空气CO2浓度增高(FACE)研究平台,设计施N量为125kg·hm-(2LN)、250kg·hm-(2NN)处理,研究大气CO2浓度比对照高200μmol·mol-1的FACE处理对三系杂交籼稻汕优63根系生长动态的影响。结果表明:(1)FACE处理使汕优63够苗期、拔节期、抽穗期每穴的不定根数、不定根总长度、根系体积以及根干物质质量均极显著大于对照;(2)FACE处理使汕优63抽穗期每穴不定根数和每穴根体积极显著增加,主要是由于FACE处理使汕优63有效分蘖期间和无效分蘖期间每穴不定根数和每穴根体积大幅度增加;(3)FACE处理使汕优63抽穗期每穴不定根总长度极显著增加,主要是由于FACE处理使汕优63有效分蘖期间、无效分蘖期间、拔节长穗期间每穴不定根总长度均大幅度增长;(4)FACE处理使汕优63抽穗期每穴根干物质质量极显著大于对照,主要是由于FACE处理使汕优63拔节长穗期间每穴根干物质质量的增长量大幅度增加;(5)FACE处理使汕优63抽穗期每条不定根长极显著大于对照,是因为FACE处理使汕优633个生长期间每条不定根的生长量均明显增加。FACE处理能够显著促进汕优63根系的发生和生长。The increase of atmospheric[CO2] affects rice growth. In this study, the Chinese unique Free Air CO2 Enrichment[FACE, 200μmol·mol^-1 higher than ambient（ AMB ）] research platform was used to investigate the effects of FACE on root growth dynamics at different growth stages of three-line indica hybrid rice euhivar Shanyou 63 under two levels of N：low（LN, 125 kg·hm^-2）and normal N（NN, 250 kg·hm^-2） during 2005--2006. Main results showed that： （ 1 ）FACE treatment significantly increased the number of adventitious roots per hole, the length of adventitious roots per hole, the roots volume per hole, the dry weight of roots per hole of Shanyou 63 at tillering, jointing and heading stages. （2）Number of adventitious roots per hole and the roots volume per hole under FACE were significantly higher than those under AMB at heading stage, which was chiefly resulted fiom the larger increment of those root traits under FACE during effective-tillering and unproductivetillering period. （3）The length of adventitious roots per hole under FACE was significantly higher than that under AMB at heading stage, which was chiefly caused by the still larger increment of the length of adventitious roots per hole under FACE before heading. （ 4 ）The dry weight of roots per hole under FACE was significantly higher than that under AMB at heading stage due to FACE substantially increasing the dry weight of roots per hole during stem elongating and panicle bearing period. （ 5 ）The length of per adventitious root under FACE was significantly high- er than that under AMB at heading stage, which was chiefly resulted from the still larger increment of the length of per adventitious root under FACE before heading. Thus, FACE significantly promoted the adventitious roots growth and development of Shanyou 63.

关 键 词：水稻 开放式空气CO2浓度增高(FACE) 根系 根系生长动态 

分 类 号：X171.1[环境科学与工程—环境科学]