用ICP-AES方法测定了新平县相同生态条件下种植的653份云南稻资源糙米8种矿质元素含量,并按丁颖的栽培稻生态型对其遗传多样性进行了研究.结果表明,云南水稻改良品种糙米P、Fe和Zn含量比地方稻种分别下降10.53%、14.76%和35.16%,但改良品种特别是粳稻Ca含量比地方种高,8种矿质元素以Ca的多样性指数最大;糙米P、Ca、Mg、Fe、Zu、Cu和Mn平均含量以粳稻的Mg、Fe和Zn,水稻的P、K和Mg,陆稻的Fe和Zn,糯稻的K和Fe,早稻的Mg和Fe相对较高.8种矿质元素平均遗传多样性指数依次为粳＞籼,陆＞水,粘＞糯,早中稻＞晚稻和地方种＞改良种,且P＞K＞Mn＞Mg＞Cu＞Zn＞Fe＞Ca;其变异系数依次为Fe＞Ca＞Cu＞Zn＞Mn＞K＞Mg＞P.%Genetic diversity of rice according to Ding' s taxonomic ecotypes in Yunnan of Southwest China were investigated based on eight mineral concentrations of brown rice, using 653 accessions harvested from Xingping experiment farm under the uniform ecological conditions by ICP-AES method. P, Fe and Zn concentrations of brown rice in improved cultivars of Yunnan were decreased by 10.53%, 14.76% and 35.16% respectively compared with that in landraces, but Ca concentration of improved cultivars (especially japonica ) was higher than that of landrace, and Ca diversity index of improved cultivars was the highest in eight mineral concentrations. There were some differences among P, Ca, Mg, Fe,Zu, Cu and Mn average concentrations in brown rice of Ding' s taxonomic ecotypes, and some higher concentrations in japonica (Mg, Fe, Zn), lowland (P, K, Mg), upland (Fe, Zn), nonglutinous (K and Fe), and early-mid rice (Mg,Fe). Average genetic diversity index of eight mineral element concentrations was in turn japonica ＞ indica, upland ＞lowland, glutinous ＞ nonglutinous, early-mid ＞ late-season rice, and landrace ＞ improved cultivars. The genetic diversity among eight mineral concentrations in brown rice was P ＞ K ＞ Mn ＞ Mg ＞ Cu ＞ Zn ＞ Fe ＞ Ca. The CV of concentration among eight mineral elements in brown rice for eight Ding's taxonomic ecotypes, improved cultivars and landraces was Fe ＞ Ca＞ Cu＞ Zn＞ Mn＞ K＞ Mg＞P.
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