摘要
在盆栽土培条件下,以武香粳14号为供试材料,研究土壤Cu含量(50-1 000mg/kg)对水稻糙米中蛋白质、Fe、Zn、M n、M g和Cu含量的影响以及Cu在籽粒不同部位中的分布。结果表明,随着土壤Cu含量的提高,糙米蛋白质含量极显著增加(r=0.88*-0.91**),而糙米中Fe、Zn、M n、M g的含量显著或极显著下降(r=-0.95**--0.58*),增加或下降的幅度因不同营养元素和不同土壤Cu处理而异;当土壤Cu含量小于200mg/kg时,糙米Cu含量随土壤Cu胁迫的加重而增加,土壤Cu含量大于200mg/kg时则相反,土壤Cu含量达200mg/kg时,糙米中Cu含量达到最大值(11.3mg/kg);Cu在籽粒不同部分的分布差异很大,从浓度分布看,米糠中Cu浓度大约是谷壳、精米的2倍,从积累量分布看,谷壳、米糠和精米中Cu积累量平均分别占籽粒总积累量的12%、24%和64%,即稻谷经精加工后,其Cu总量下降1/3左右。
In order to investigate the effect of soil Cu stress （50 - 1000 mg. kg - 1 ） on the concentrations of protein, Fe, Zn, Mn, Mg, Cu and the distribution of Cu in the different products of rice （ Oryza sativa L. ） grains processing, pot experiments are conducted using the japonica cultivar Wuxiangjing 14. Main results show that protein concentrations of brown rice increase with the increment of soil Cu levels （ r = 0.88 ＊ - 0.91 ＊ ＊ ）, but Fe, Zn, Mn and Mg concentrations of brown rice generally decrease with soil Cu concentrations （r = -0.95 ＊ ＊ - -0.58 ＊ ）. The degrees of the increases and decreases differ with the elements and soil Cu levels. Cu concentrations in rice grain increase with soil Cu levels below 200 mg kg - 1, but decrease with soil Cu levels above 200 mg kg - 1, with peak Cu concentration at soil Cu level of 200 mg kg - 1. Cu is not distributed evenly in different parts of grain structure. On the concentration distribution, it is about 2 -fold in cortex （embryo） than in chaff and polished rice. With regard to Cu quantities accumulated in the products, about 64% of the total Cu in grain is accumulated in polished rice averagely, about 24% in cortex （embryo）, and about 12% in chaff. So, about 1/3 of the Cu in grain is eliminated after grain processing （chaff, cortex and embryo are removed）.
出处
《常州工学院学报》
2007年第1期33-38,共6页
Journal of Changzhou Institute of Technology
基金
江苏省科技发展计划(社会发展)。项目编号:BS2006019
2004年江苏省"六大人才高峰"项目
关键词
水稻
土壤污染
CU
稻米品质
rice
soil contamination
Cu
grain quality
