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In order to improve the anti-aging ability of flour processed products, in this current study, defatted rice bran soluble dietary fiber was added to wheat starch in different proportions, and steamed bread was made after dough fermentation. The quality change and anti-aging effect of steamed bread were analyzed. The results indicated that the addition of rice bran soluble dietary fiber could delay the aging of Chinese steamed bread. When dosage was 5%, dough had the largest expanded volume, compared with the control group, Chinese steamed bread with dietary fiber addition had a decreased (by 35%) hardening rate, and after 5 days storage at 4 ℃, reduced hardness (by 33.30%) and chewiness (by 36.84%), increased elasticity (by 9.00%). With the increasing of the amount of rice bran soluble dietary fiber, the color of Chinese steamed bread became darker, the structure became dense, the air holding capability decreased, causing a lower quality (lower specific volume, higher hardness and chewiness, lower elasticity). Compared with Chinese steamed bread without rice bran soluble dietary fiber, storage performance and texture of Chinese steamed bread with dietary fiber had significant improvement, and its anti-aging ability was also improved.

Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most important fungal diseases affecting wheat (Triticum aestivum L.) worldwide. In this study, the genetic diversity and population structure of Pst isolates were analyzed using 15 microsatellite markers. Isolates were collected from five wheat cultivars with different levels of resistance from Yanting county and Fucheng district, Mianyang city, Sichuan province, China. The aim of this study was to investigate whether Pst populations are differentiated by wheat genotype or geographic origin. Seventy-six multilocus genotypes (MLGs) were identified from all 289 single uredinial isolates. In general, the genotypic diversity of Pst populations from five wheat cultivars in Fucheng was higher than that in Yanting. In addition, the genetic diversity was highest in the Pst populations from Mianmai 367, a cultivar considered to be highly resistant. The unweighted pair group method with arithmetic mean (UPGMA) phylogenetic tree, Bayesian clustering analysis, and minimum spanning network for the MLGs revealed two major genetic clusters based on geographical location. Greater differentiation was observed between the populations from the two sampling locations than between the populations from different hosts in the same location. The results suggest that geographic and environmental differences could partially explain the genetic differentiation of Pst more than wheat genotype. This study provides novel insight into the interactions between Pst populations and their hosts. The results could be helpful in designing more effective management strategies for stripe rust in wheat production.