CAJ | 학술논문

2013年利用稻田FACE（Free Air CO2 Enrichment）平台，以武运粳23为供试材料，主区CO2处理分别设置环境CO2浓度（Ambient）和高CO2浓度[比Ambient高（200±40）μL·L-1]两个水平，裂区锌处理分别设置对照（不施锌）和叶面施锌（齐穗后每隔5 d喷施0.2%ZnSO4，共3次）处理，研究常规粳稻籽粒不同部位锌浓度、植酸浓度以及[植酸]/[Zn2+]摩尔比值对CO2和锌处理的响应。结果表明，籽粒不同部位的锌浓度、植酸浓度以及[植酸]/[Zn2+]摩尔比均表现为精米<糙米<糠层，糠层部位分别是精米部位的4.8、45.3倍和9.6倍。大气CO2浓度升高对精米、糙米和糠层部位锌浓度均无显著影响，但锌处理使对应部位锌浓度平均分别增加8.5%、17.1%和22.7%，均达显著或极显著水平。CO2和锌处理对稻米各部位植酸浓度均无显著影响。大气CO2浓度升高对稻米各组分[植酸]/[Zn2+]摩尔比均无显著影响，但锌处理使精米、糙米和糠层[植酸]/[Zn2+]摩尔比平均分别下降5.2%、12.9%和18.7%，糙米和糠层部分达显著水平。方差分析表明，锌处理与部位间的互作对锌浓度、[植酸]/[Zn2+]摩尔比的影响达极显著和显著水平。糙米和糠层中[植酸]/[Zn2+]摩尔比与对应部位锌浓度均呈极显著负相关，但与植酸浓度相关不密切。以上数据说明，高浓度CO2环境下武运粳23稻米不同部位锌浓度及有效性无显著变化，但结实期叶面喷施锌肥，可改善该品种稻米不同部位特别是外层的锌营养水平。
2013년이용도전FACE（Free Air CO2 Enrichment）평태，이무운갱23위공시재료，주구CO2처리분별설치배경CO2농도（Ambient）화고CO2농도[비Ambient고（200±40）μL·L-1]량개수평，렬구자처리분별설치대조（불시자）화협면시자（제수후매격5 d분시0.2%ZnSO4，공3차）처리，연구상규갱도자립불동부위자농도、식산농도이급[식산]/[Zn2+]마이비치대CO2화자처리적향응。결과표명，자립불동부위적자농도、식산농도이급[식산]/[Zn2+]마이비균표현위정미<조미<강층，강층부위분별시정미부위적4.8、45.3배화9.6배。대기CO2농도승고대정미、조미화강층부위자농도균무현저영향，단자처리사대응부위자농도평균분별증가8.5%、17.1%화22.7%，균체현저혹겁현저수평。CO2화자처리대도미각부위식산농도균무현저영향。대기CO2농도승고대도미각조분[식산]/[Zn2+]마이비균무현저영향，단자처리사정미、조미화강층[식산]/[Zn2+]마이비평균분별하강5.2%、12.9%화18.7%，조미화강층부분체현저수평。방차분석표명，자처리여부위간적호작대자농도、[식산]/[Zn2+]마이비적영향체겁현저화현저수평。조미화강층중[식산]/[Zn2+]마이비여대응부위자농도균정겁현저부상관，단여식산농도상관불밀절。이상수거설명，고농도CO2배경하무운갱23도미불동부위자농도급유효성무현저변화，단결실기협면분시자비，가개선해품충도미불동부위특별시외층적자영양수평。
Elevated CO2 concentrations enhance plant growth and biomass production, but may also decrease concentrations of elements in plants, thus reducing rice quality. In this study, a conventional japonica rice variety Wuyunjing 23 was grown under two levels of CO2 con-centrations[ambient and(200±40)μL·L-1 higher than ambient] in a Free Air CO2 Enrichment(FACE)facility installed in a paddy field. Fo-liar Zn applications(0.2%ZnSO4)were performed for 3 times at 5-day interval right after flowering. Rice seeds were divided into milled rice, brown rice and bran and subjected to analysis of Zn and phytate(PA)concentrations. Zinc and PA concentrations and PA to Zn molar ratios in different parts of rice grains were all in order of milled rice<brown rice<bran, and they were respectively 4.8 times, 45.3 times and 9.6 times higher in the bran than in milled rice. Elevated CO2 had no significant effects on Zn concentrations in different parts of rice grains;while foliar Zn applications significantly increased Zn concentrations of milled rice, brown rice and bran by 8.5%, 17.1%and 22.7%, respectively. Phytate concentrations of milled rice, brown rice and bran were not affected by either CO2 or Zn treatments. The molar ratio of PA to Zn in different parts of rice grains was not affected by elevated CO2, but decreased by Zn applications by 5.2%in milled rice, 12.9%(P<0.05)in brown rice and 18.7%(P<0.05)in bran. Zinc treatment and seed part interaction had significant effects on Zn concentrations and PA to Zn molar ratios. The molar ratio of PA to Zn in brown rice or bran was negatively correlated with Zn concentration, but not with PA concentration. Our results indicate that content and bioavailability of micronutrient Zn in edible part of rice Wuyunjing 23 were not af-fected by elevated CO2, while foliar Zn application during grain-filling could improve Zn nutrition of rice grains, particularly in outer layer of rice grains.