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谷类作物籽粒中镉含量太高对人体有害。有一些报道指出 ,硬粒小麦 (Triticum turgidumL.var. durum )比普通小麦 (T.aestivam L.)的籽粒中含镉量高。本研究的目的是检测硬粒小麦籽粒含镉量的遗传性 ,为培育低籽粒含镉量品种提供理论依据。用于测定籽粒含镉量的材料有一个杂交组合的F2 代和 F2 -3 家系、两个杂交组合的 F2 -3 和 F3 -4 家系 ;用另外 13个杂交组合的随机 F8-9和 F8-10 家系测定了籽粒和叶片中的含镉量。试验在砂壤土、混合型细绵土及潜育黑土上进行。结果表明 ,籽粒含镉量主要由单基因控制 ,低镉含量为显性。叶片含镉量与籽粒含镉量高度相关 (r=0 .87～ 0 .89,P<0 .0 1)。因此 ,可以用叶片含镉量来预测基因型 ,这一点在将低镉性状导入高镉品种的回交育种中将很有用处。由 F2 -3后代与 F2 代亲本的回归或 F2 -4 后代与 F2 -3 亲本的回归测得的遗传力 (以标准单位计 )范围为 0 .84±0 .0 6～ 0 .88± 0 .0 8,表明培育低籽粒含镉量品种是可行的。由变异因素 (年份、试验地点、重复、基因型 )估算的遗传力为 0 .78,90 %置信区间为 0 .6 7～ 0 .88。籽粒含镉量的单基因遗传和高遗传力将有助于低含镉量硬粒小麦品种的培育
Cereal crop grain cadmium content is too high on the human body harmful. It has been reported that Triticum turgidum L. var. Durum contains a higher amount of cadmium in kernels than T. aestivum L. The purpose of this study is to detect the heredity of Cd content in the grains of durum wheat and to provide a theoretical basis for cultivating low grain Cd content. The materials used to determine the amount of cadmium contained in the grain consisted of F2 and F2-3 pedigrees with crosses and F2-3 and F3-4 crosses between the two crosses; with another 13 crosses of random F8-9 and F8- The 10 lines determined the cadmium content in kernels and leaves. The tests were carried out on sandy loam, mixed soils and potential black soil. The results showed that the content of cadmium in grains was mainly controlled by single gene and the content of low cadmium was dominant. Leaf cadmium content and grain cadmium content is highly correlated (r = 0.87 ~ 0.89, P <0.01). Therefore, it is useful to predict the genotype by the cadmium content of the leaves, which is very useful in backcross breeding to introduce low cadmium traits into high-cadmium varieties. The heritability (in standard units) of the regression of F2 -3 progeny with F2 progeny or F2 -2 progeny with F2 -3 parents ranged from 0.84 ± 0.60 to 0.88 ± 0 .0 8, indicating that cultivation of low-grain cadmium content is feasible. The heritability estimated by variation factors (year, place of experiment, repeat, genotype) was 0.78, and the 90% confidence interval was between 0.67 and 0.88. Single-gene inheritance and high heritability of grain cadmium content will contribute to the cultivation of low cadmium durum wheat varieties