摘要
本文主要研究了水分管理和叶面喷施外源植物激素乙烯(ETH)对水稻(Oryza sativa L.)根表铁膜、镉(Cd)积累以及健康风险指数的影响。通过盆栽试验,在拔节期、扬花期和灌浆期喷施2种浓度(50μmol/L和100μmol/L)乙烯(ETH)3次,同时采用连续淹水(CF)和间隔淹水(IF)2种水分管理模式。结果表明:(1)与IF水分管理模式相比,CF水分管理模式下,土壤中Cd的赋存形态改变,弱酸可溶态Cd由36%降至30%,可还原态Cd由30%增加到40%;(2)与IF水分管理模式相比,CF水分管理模式下,水稻根表铁膜中Fe和Cd含量均显著增加,外源喷施ETH也会显著提高2种水分管理模式下铁膜中Fe和Cd含量,最多提高了50.59%和58.06%;(3)与IF水分管理模式相比,CF水分管理模式下,水稻根、叶、糙米及精米中的Cd含量均显著下降;外源喷施ETH也有利于降低2种水分管理模式下水稻各部位Cd含量,其中CF+50ETH处理下精米中Cd含量最低,与CF处理相比,精米中Cd含量由0.68 mg/kg降至0.45 mg/kg,降幅为33.82%;(4)外源喷施ETH显著降低了2种水分管理模式下Cd从根-茎和茎-籽粒的转运系数,均以CF+50ETH处理下转运系数最低,与CF处理相比分别降低了55.17%和23.81%;(5)CF水分管理模式和喷施ETH处理均对降低稻米Cd健康风险指数有很好的作用。由此可见,CF水分管理模式和外源喷施ETH在降低水稻对Cd的积累中具有一定的应用前景。
The effects of water management and foliar spraying of exogenous plant hormone ethylene(ETH)on the ac-cumulation of rhizosphere iron membrane,cadmium(Cd)and health risk index of rice were studied.Through the potting test,two concentrations(50μmol/L and 100μmol/L)ethylene(ETH)were sprayed three times at the jointing stage,the flowering stage and the grouting stage,and the water management modes of continuous flooding(CF)and interval flooding(IF)were adopted.Compared with the IF water management mode,the storage morphology of Cd in the soil was changed in the CF water management mode,and the soluble Cd was reduced from 36%to 30%,and the reducing state Cd was increased from 30%to 40%.Compared with the IF water management mode,the Fe and Cd content in the rice root surface iron film were significantly increased in the CF water management mode,and the exogenous spraying of ETH also significantly increased the Fe and Cd content in the iron film under the two water management modes,up to 50.59%and 58.06%.Compared with the IF water management mode,the Cd content in rice roots,leaves,brown rice and polished rice decreased significantly under the CF water management mode.The external spraying of ETH was also conducive to reducing the cadmium content of rice under the two water management modes,among which the Cd con-tent in polished rice under CF+50ETH treatment was the lowest,and the Cd content in polished rice decreased from 0.68 mg/kg to 0.45 mg/kg,a decrease of 33.82%compared with CF treatment.Exogenous spraying of ETH significantly reduced the transport coefficients of Cd from rhizome and stem-grain under the two water management modes,and the transport coefficients were the lowest under CF+50ETH treatment,which was reduced by 55.17%and 23.81%respec-tively compared with CF treatment.CF water management mode and spray ETH treatment have a good effect on reduc-ing the health risk index of rice Cd.It can be seen that CF water management mode and exogenous spraying of ETH have certain application prospects for reducing
作者
张明富
王松
李佳原
王雪彬
李蒙
牙丰硕
黄丹妮
何冰
顾明华
王学礼
韦燕燕
ZHANG Mingfu;WANG Song;LI Jiayuan;WANG Xuebin;LI Meng;YA Fengshuo;HUANG Danni;HE Bing;GU Minghua;WANG Xuei;WEI Yanyan(College of Agricultural,Guangxi University,Nanning,Gunagxi 530004,China)
出处
《热带作物学报》
CSCD
北大核心
2024年第5期1072-1083,共12页
Chinese Journal of Tropical Crops
基金
国家自然科学基金项目(No.41967045)
桂农科盟项目(No.202214)。
关键词
镉
水稻
乙烯
水分管理
根表铁膜
健康风险指数
cadmium
rice
ethylene
water management
iron plaque
health risk index
