SS1 (NAL1)- and SS2-Mediated Genetic Networks Underlying Source-Sink and Yield Traits in Rice (Oryza sativa L.)

• DOI: 10.1371/journal.pone.0132060
• Publication Date: 2015-07-10T18:25:19Z
• Authors: Jian-Long Xu; Yun Wang; Fan Zhang; Yuan Wu; Tian-Qing Zheng; Yong-Hong Wang; Xiu-Qin Zhao; Yan-Ru Cui; Kai Chen; Qiang Zhang; Hong-Xuan Lin; Jia-Yang Li; Zhi-Kang Li
• Keywords: Introgression; Panicle; Sink (geography)

Source leaf/sink capacity (SS) traits are important determinants of grain yield (GY) rice. To understand the genetic basis SS relationship in rice, five and GY rice were genetically dissected using two reciprocal introgression populations. Seventy-three QTL affecting identified, most which detected one parental backgrounds (GBs). Two major at bins 4.7 (SS1) 3.12 (SS2) associated consistently with all measured both GBs across contrasting environments. Strong interactions between SS1/SS2 led us to discovery networks traits. The SS1 acted as a regulator controlling groups downstream source leaf width number per panicle (GNP). SS2 functioned positively regulating different length, GNP, weight, GY. Map-based cloning indicates that is NAL1 involved polar auxin/IAA transport. Different alleles apparently able qualitatively and/or quantitatively control IAA transport from apical meristem plant tissues thus regulate those loci/pathways There was functional allele non-functional mutation parents each or SS2, detectable only presence SS2. Our results provided direct evidence controlled by complex signaling pathways suggest further improvement potential enhanced balanced relationships can be achieved accurately manipulating allelic combinations loci mediated pathways.