Abstract:

It was analyzed using ICP-AES spectrometer method that ecogeographic difference and variation pattern based on P, K, Ca, Mg, Fe, Zn, Cu and Mn concentrations in brown rice of 583 accessions landraces for core collection from the five regions and 16 prefectures/cities in Yunnan Province. Results showed that the mean and diversity index of 8 mineral concentrations of 583 accessions in brown rice followed an order as P>K>Mg>Ca>Fe>Zn>Cu>Mn,P>Mn>Cu>K>Mg >Zn>Fe>Ca. Central Yunnan single season japonica-indica region was the distribution center of higher Ca(164.86 μg/g), Fe(38.33 μg/g) and Zn (39.03 μg/g) concentrations in brown rice, especially Dali and Chuxiong prefectures with the highest Ca(205.88, 223.33 μg/g), Fe (87.89, 121.45 μg/g) and Zn(44.13, 39.33 μg/g) concentrations. Simao prefecture was the lowest P and K and Mg concentrations zones in brown rice among prefectures, Honghe and Wenshan were the distribution center of K and Cu concentrations of brown rice in Yunnan. For one of the important discover in this article, the genetic diversity center based on 8 mineral concentrations in brown rice from Lincang, Simao, Xishuangbanna and Dehong prefectures has the similar trend with both the genetic and gene diversity center of rice landraces in Yunnan based on morphological traits and isozyme and SSR markers. The region with highest genetic diversity index for grain-P concentrations in brown rice was located in rice genetic diversity center of Yunnan Province in China. Therefore, the diversity of mineral concentrations, especially for phosphorus, in brown rice is likely to associate with the genetic and gene diversity in rice.

Key words: Element concentration, Variation pattern, Ecogeographic type, Yunnan landraces