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植物在吸收和富集重金属能力上表现出显著的种内差异即基因型差异。本研究筛选了90份水稻核心种质,测定50μmol·L-1镉(Cd)处理后的相对根长差异量(RRL)和相对株高差异量(RPH),藉此确定Cd耐性较好的水稻品种有11个,Cd敏感的有9个。进一步检测在Cd污染土壤中生长的部分品种水稻各组织中的Cd及Ca、K、Mg、Fe、Mn、Zn等含量,结果表明Cd影响了其他营养元素的积累,并且表现出组织特异性和种质特异性。同其他材料相比,仅耐Cd材料‘BINIRHEN’各组织Cd含量较低,并且其穗中的Mn、Fe和Zn含量均大于茎,因此‘BINIRHEN’为Cd胁迫遗传改良的优势材料。本研究结果对筛选Cd耐受的水稻品种以及克隆水稻基因组中耐受Cd的关键基因提供参考。
Plants show significant intraspecific differences ie genotypic differences in ability to absorb and enrich heavy metals. In this study, 90 rice core collections were screened and the relative root length difference (RRL) and relative height difference (RPH) of 50 μmol·L-1 Cd were measured to determine the Cd tolerance There are 11 rice varieties and 9 are Cd-sensitive ones. The contents of Cd, Ca, K, Mg, Fe, Mn and Zn in some rice varieties grown in Cd-contaminated soil were further examined. The results showed that Cd affected the accumulation of other nutrients and showed tissue specificity and Germplasm specificity. Compared with other materials, only the Cd-tolerant material “BINIRHEN” in each tissue had lower Cd content and Mn, Fe and Zn contents in the panicles than the stems. Therefore, ’BINIRHEN’ is the predominant material for genetic improvement of Cd stress. The results of this study provide references for screening Cd-tolerant rice varieties and cloning the key genes that tolerate Cd in rice genome.