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不同基因型玉米品種對Pb 的富集特征

不同基因型玉米品種對Pb 的富集特征

秦榕璘,李

元,祖艷群,湛方棟,陳建軍*

(云南農業大學資源與環境學院,云南昆明650201)

農業資源與環境學報

2016年5月·第33卷·第3期:

268-275May 2016·Vol.33·

No.3:268-275Journal of Agricultural Resources and Environment

摘要:為了研究不同基因型玉米品種對Pb 的富集特征,選用2個Pb 低富集玉米品種(曲辰11號、曲辰3號)

和2個Pb 高富集玉米品種(靖豐8號、旭玉1446),開展Pb 脅迫(2000mg ·kg -1)下的大田試驗,研究了玉米植株生物量的變化、各部位Pb 含量、Pb 總吸收量、富集與轉運規律、土壤pH 值及有效態Pb 含量。結果表明:(1)與對照相比,Pb 脅迫導致4個玉米品種根、莖、葉和籽粒生物量不同程度的下降,總生物量下降9.65%~20.46%,但低富集玉米品種生物量的下降程度小于高富集玉米品種;(2)玉米各部位的Pb 含量分配規律為根>葉>莖>籽粒,分別為95.39~121.02、25.56~43.21、14.06~25.41、2.52~5.38mg ·kg -1;低富集玉米品種根的Pb 含

量高于高富集玉米品種,而莖、葉和籽粒的Pb 含量低于高富集玉米品種;玉米植株對Pb 的總吸收量為4.46~7.94mg ·株-1,低富集玉米品種植株的Pb 總吸收量顯著低于高富集玉米品種;(3)不同基因型玉米品種對Pb 的富集系數和轉運系數均小于1,表現為低富集玉米品種低于高富集玉米品種;(4)不同基因型玉米品種土壤pH 值為6.60~6.82,且低富集玉米品種顯著高于高富集玉米品種,土壤有效態Pb 含量范圍為969.86~1116.15mg ·kg -1。關鍵詞:玉米基因型;Pb 含量;富集特征;有效態Pb 中圖分類號:X503.231文獻標志碼:A 文章編號:2095-6819(2016)03-0268-08doi :10.13254/j.jare.2016.0007

引用格式:

秦榕璘,李

元,祖艷群,等.不同基因型玉米品種對Pb 的富集特征[J].農業資源與環境學報,2016,33(3)

:268-275.QIN Rong-lin,LI Yuan,ZU Yan-qun,et al.Accumulation Characteristics of Pb by Zea Mays of Different Genotyoes[J].Journal of Agricultural Resources and Environment ,2016,33(3)

:268-275.收稿日期:

2016-01-05基金項目:國家自然科學-云南省聯合基金(U1202236)

作者簡介:秦榕璘(1990—),女,山西晉中人,碩士研究生,從事土壤重金屬污染與修復生態學研究。E-mail :

[email protected]://www.884562.tw/doc/3a0296ad1ed9ad51f11df205.html *通信作者:陳建軍E-mail :

[email protected]://www.884562.tw/doc/3a0296ad1ed9ad51f11df205.html Accumulation Characteristics of Pb by Zea Mays of Different Genotyoes

QIN Rong-lin,LI Yuan,ZU Yan-qun,ZHAN Fang-dong,CHEN Jian-jun *

(College of Resources and Environment,Yunnan Agricultural University,Kunming 650201,China )Abstract :To determine the characteristics of lead (Pb )accumulation by different maize genotypes,two low accumulation genotypes (Quchen 11,Quchen 3)and two high accumulation maize genotypes (Jingfeng 8,Xuyu 1446)were used in a field experiment under Pb stress

(2000mg ·

kg -1).The following parameters were measured including the change of plant biomass ,Pb contents in different plant parts,total Pb uptake ,Pb accumulation and translocation of different maize varieties ,soil pH value and available Pb contents in soils.The results showed that:(1)Compared with the control,the Pb stress caused a decrease at differnet levels on the biomass of roots,stems,leaves and grains of the four maize genotypes.The plant biomass decreased by 9.65%~20.46%.And the decrease level on the plant biomass of the low accumulation maize genotypes was less than the high accumulation maize genotypes.(2)The Pb contents were found highest in the roots (95.39~121.02

mg ·kg -1),followed by the leaves (25.56~43.21mg ·

kg -1)and stems (14.06~25.41mg ·kg -1),and lest in the grains (2.52~5.38mg ·kg -1).Moreover,the Pb contents in roots were higher of low accumulation maize genotypes than high accumulation maize genotypes.In contrast,the Pb contents in the stems,leaves and grains were less of the low accumulation maize genotypes than the high accumulation maize genotypes.The total Pb accumulation of maize was 4.46~7.94mg per plant,and which was significant less of the low accumulation maize genotypes than the high accumulation maize genotypes.(3)For the four maize genotypes,both the accumulation factor and translocation factor of Pb were less than 1,and were smaller of the low accumulation maize genotypes than the high accumulation maize genotypes.(4)The pH values in soils were 6.60~6.82,which were significant higher of the low accumulation maize genotypes than the high accumulation maize genotypes,the available Pb contents in soils were 969.86~1116.15mg ·

kg -1。Keywords :maize genotype;Pb content;accumulation characteristic;available Pb

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