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Lead (Pb) distribution and accumulation in different plant parts and its associations with grain Pb contents in fragrant rice.
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.chemosphere.2020.126003
Umair Ashraf 1 , Mian Habib-Ur-Rahman Mahmood 2 , Saddam Hussain 3 , Farhat Abbas 4 , Shakeel Ahmad Anjum 3 , Xiangru Tang 5
Affiliation  

Lead (Pb) affects the growth and productivity of rice negatively through soil-Pb-plant interactions. A pot experiment was conducted to assess the Pb uptake and its distributive pattern in different fragrant rice cultivars i.e., Meixiangzhan-2 (MXZ-2), Xiangyaxiangzhan (XYXZ), Guixiangzhan (GXZ), Basmati-385 (B-385), and Nongxiang-18 (NX-18) and relationship of Pb uptake with grain Pb-contents and rice yield and related traits i.e., productive tillers hill-1, spikelets panicle-1, filled grain percentage, and 1000-grain weight. Lead as Pb(NO3)2 was applied at 0 (control), 400 (Pb1), 800 (Pb2) and 1200 mg kg-1 (Pb3) of soil in solution form. Results showed that all rice cultivars accumulated different concentration of Pb, with the highest in roots and the lowest in grains. The translocation factors (TF) from stems to leaves were higher than root to stems and leaves to ears/grains. The grain Pb contents have significant positive associations with ear Pb contents and TF of Pb from leaves to ear at reproductive stage. Moreover, relative changes (RC) in grain yields have significant correlations with the RC in some yield attributes i.e., productive tillers per hill, spikelets per panicle, and filled grain percentage under Pb toxicity. Overall, grain Pb contents are affected mainly by the transference of leaves Pb contents to ears/grains (an index to determine final grain Pb contents) whereas RC in rice yields suggested its relationships with some agronomic attributes of fragrant rice under Pb stress.

中文翻译:

香米中铅在植物不同部位的分布和积累及其与籽粒铅含量的关系。

铅(Pb)通过土壤-铅-植物的相互作用对水​​稻的生长和生产力产生负面影响。进行了盆栽试验,以评估在不同香型水稻品种中的Pb吸收及其分布方式,即Meixiangzhan-2(MXZ-2),Xianyaxiangzhan(XYXZ),Guixiangzhan(GXZ),Basmati-385(B-385)和Nongxiang-18(NX-18)以及Pb吸收与籽粒Pb含量,水稻产量及相关性状的关系,即生产性分till Hill-1,小穗穗1,籽粒百分率和1000粒重。以0(对照),400(Pb1),800(Pb2)和1200 mg kg-1(Pb3)的溶液形式施用铅作为Pb(NO3)2。结果表明,所有水稻品种均积累了不同浓度的铅,其根系最高,籽粒最低。从茎到叶的转运因子(TF)高于从根到茎,从叶到穗/籽粒的转运因子。籽粒中铅的含量与籽耳中铅的含量以及生殖阶段叶片到耳朵的铅的TF有显着的正相关。此外,谷物产量的相对变化(RC)在某些产量属性上与RC有着显着的相关性,例如每丘的生产性耕作机,每穗的小穗和在Pb毒性下的实粒率。总体而言,籽粒铅含量主要受叶片铅含量向穗粒/谷物的转移(决定最终籽粒铅含量的指标)的影响,而水稻产量中的RC表明其与香米在铅胁迫下的某些农学特性有关。籽粒中铅的含量与籽耳中铅的含量以及生殖阶段叶片到耳朵的铅的TF有显着的正相关。此外,谷物产量的相对变化(RC)在某些产量属性上与RC有着显着的相关性,例如在铅毒性下每个小山的耕作分,、每个圆锥花序的小穗和实粒率。总体而言,籽粒铅含量主要受叶片铅含量向穗粒/谷物的转移(决定最终籽粒铅含量的指标)的影响,而水稻产量中的RC表明其与香米在铅胁迫下的某些农学特性有关。籽粒中铅的含量与籽耳中铅的含量以及生殖阶段叶片到耳朵的铅的TF有显着的正相关。此外,谷物产量的相对变化(RC)在某些产量属性上与RC有着显着的相关性,例如每丘的生产性耕作机,每穗的小穗和在Pb毒性下的实粒率。总体而言,籽粒铅含量主要受叶片铅含量向穗粒/谷物的转移(决定最终籽粒铅含量的指标)的影响,而水稻产量中的RC表明其与香米在铅胁迫下的某些农学特性有关。铅毒性下的填充谷物百分比。总体而言,籽粒铅含量主要受叶片铅含量向穗粒/谷物的转移(决定最终籽粒铅含量的指标)的影响,而水稻产量中的RC表明其与香米在铅胁迫下的某些农学特性有关。铅毒性下的填充谷物百分比。总体而言,籽粒铅含量主要受叶片铅含量向穗粒/谷物的转移(决定最终籽粒铅含量的指标)的影响,而水稻产量中的RC表明其与香米在铅胁迫下的某些农学特性有关。
更新日期:2020-01-26
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