Abstract:

Genetic diversity of rice according to Ding’s taxonomic ecotypes in Yunnan of Southwest China were investigated based on 8 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 8 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 8 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 8 mineral concentrations in brown rice was P>K>Mn>Mg>Cu>Zn>Fe>Ca. CV of concentration among 8 mineral elements in brown rice for 8 Ding’s taxonomic ecotypes, improved cultivars and landraces was Fe>Ca>Cu>Zn> Mn>K>Mg>P.

Key words: Mineral content, Diversity, Taxonomic ecotypes, Rice landraces, Yunnan