摘要
以12个应急性低镉积累水稻品种为研究材料,采用盆栽试验分别在水稻生长的分蘖期、孕穗期、灌浆期设置连续7d低温、中温、高温3个温度处理,旨在探究温度与水稻镉吸收、转运、分配的关系,为探明低镉积累水稻品种的环境温度稳定性提供理论依据.结果 表明,温度对水稻糙米镉含量有极显著的影响,不同温度处理下品种间的平均糙米镉含量最大相差55.42%.分蘖期和灌浆期高温处理糙米的平均镉含量高于低、中温处理,原因是高温促进了水稻对镉的吸收、转运和分配.孕穗期高温处理促进了茎叶镉向枝梗空粒的转运和分配,导致糙米镉含量以中温处理最高.不同处理条件下低镉积累水稻品种糙米镉含量的温度稳定性存在一定的差异,各处理时期中灌浆期处理的品种稳定性最高.12个供试品种中,Z17(中嘉早17)、X42(湘早籼42)、L17(两优早17)、Z189(株两优189)综合糙米镉含量较低且温度稳定性较好,在实际生产中有较高的应用价值.
With 12 low cadmium accumulation rice varieties as the materials,a pot experiment,setting the low,medium and high temperature treatments of seven days in the tillering,booting and grain filling stages,was carried out to investigate the characteristics of grain cadmium accumulation and understand their temperature stability in rice.The results showed that temperature had a very significant effect on cadmium content in brown rice,and the maximum difference in average brown rice cadmium content among the varieties was 55.42%under different temperature treatments.The average brown rice cadmium content treated with the high temperature at tillering stage and grain filling stage was higher than that with the low and medium temperatures,because high temperature promoted the absorption,transport and distribution of cadmium in rice.The high temperature treatment at booting stage promoted the transport and distribution of cadmium from stems and leaves to branches and empty grains,resulting in the highest brown rice cadmium content under the medium temperature treatment.There existed some difference in the temperature stability of brown rice cadmium content under different treating conditions,and the stability coefficient of the rice varieties was highest at the grain filling stage among different growth stages.Among 12 tested varieties,Z17(Zhongjiazhao 17),X42(Xiangzhaoxian 42),L17(Liangyou Zhao 17)and Z189(Zhuliangyou 189)had lower grain cadmium content and better temperature stability,thus having a high application value in practical production.
作者
罗玲
方宝华
刘洋
余锋
李强
张玉烛
LUO Ling;FANG Bao-hua;LIU Yang;YU Feng;LI Qiang;ZHANG Yu-zhu(Longping Branch,Hunan University,Changsha,Hunan 410125,China;Hunan Hybrid Rice Research Center,Changsha,Hunan 410125,China;Hunan Rice Research Institute,Changsha,Hunan 410125,China)
出处
《杂交水稻》
CSCD
北大核心
2020年第2期52-59,共8页
Hybrid Rice
基金
国家重点研发计划(2018YFD0301001)。
关键词
水稻
镉
温度
积累特性
rice
cadmium
temperature
accumulation characteristic
