QTL mapping of the pasting properties of wheat flour treated by papain digestion.

Protein hydrolysis is widely used in the food industry to improve food or industrial quality, and processing is carried out concurrently or subsequently to starch pasting. Inthis study,QTLmapping of the pasting properties of natural wheat flour (NWF) and papain-treated flour (PTF) was performed in three environments. These analyses involved a set of 173 F9:10 recombinant inbred lines (RILs) derived from "Shannong01-35×Gaocheng9411" witha genetic linkagemapconsisting of 6248 molecular markers. The additive, epistatic, and epistatic×environment interaction effects of QTLs for pasting properties were analyzed. A total of 43 and 31 additive QTLs for pasting properties were detected using NWF and PTF, respectively. QPv1A.4-1, QPv4B.4-17, QTv1A.4-1, QTv4B.4-17, QSb4B.4-17, QPt1A.4-1, and QPt4B.4-17 were identified using both NWFand PTF. In contrast, QPv6A.2-128, QTv6A.2-128, QFv6A.2-75, and QBd6A.2-128 were only identified in wheat flour; thus, these QTLs are related to the papain digestion site. Five and eight pairs of epistatic interaction QTLs were identified in NWF and PTF, respectively. QPv1A.4-1/QPv4B.4-17 and QTv1A.4-1/QTv4B.4-17 were identified in NWF and PTF, whereas, QInA1A.4-1 and QInA4B.4-17 were only detected in PTF. Two and three pairs of epistatic×environment interactions were detected inNWFandPTF, respectively. In the present study, two importantQTLclusters (≥3QTLs) were detected from NWF, and three clusters were detected from PTF. The results of the comprehensive evaluation of protein hydrolysis and starch pasting provide valuable information to facilitate the improvement of wheat flour quality and promote the molecular breeding of wheat. [ABSTRACT FROM AUTHOR]