水稻Wx基因与稻米AC、GC和GT的遗传关系

以60个籼稻品种（或品系）和57个（G46B/D香1B）B3F5株系为材料，通过检测Wx基因型，同时测定AC、GC和GT，探讨了水稻Wx基因与稻米AC、GC和GT的遗传关系。结果AC与GC极显著负相关，且二者均与Wx基因型密切相关，Wx基因的GG型材料具有较高的AC和较硬的GC，而TT型材料具有中等的AC和较软的GC，在全部57个B3F5代株系中AC的高低和

Genetic Relationship among Wx Gene, AC, GC and GT of Rice

By testing Wx genotype and measuring am ylose content (AC), gel consistency (GC) and gelatinization temperature (GT) of 60 indica cultivars (or lines) and 57 B 3F 5 breeding lines of G4 6B/D Xiang 1B, the genetic relationship among Wx gene, AC, GC and GT of rice was explored. The results showed that there were significant negative cor relations between AC and GC, with -0.836 and -0.906 of correlation coeffici ents in the two material groups, respectively. Moreover, both of AC and GC we re closely related to Wx genotypes, i.e. the materials with GG-type of Wx gene had higher AC and harder GC, however, the materials with TT-type of Wx gene had moderate AC and softer GC. Among 57 B 3F 5 lines, AC rang ed from 20.4% to 27.0% with the mean value of 24.9% and GC from 25 mm to 31 m m with the mean value of 27 mm in 26 lines with GG-type of Wx gene, howeve r, AC ranged from 10.8% to 13.4% with the mean value of 11.8% and GC from 46 mm to 77 mm with the mean value of 57 mm in 31 lines with TT-type of Wx ge ne. So the GG-type of lines always had high AC and hard GC, the TT-type of l ines always had moderate AC and soft GC, and no recombinant lines were found. In other words, high or low AC and hard or soft GC were synchro-segregated with Wx genotypes. It was suggested that AC was mainly controlled by Wx gene and GC by Wx gene or one locus tightly linked to it. On the other hand, G T was not significantly correlated to AC and Wx genotype in 60 indica cu ltiv ars. For the cultivars that had different AC or Wx genotypes, the range of GT was the same on the whole. GT of 21 cultivars with GG-type of Wx gene ranged from 3.3 to 7.0 with the mean value of 4.9, however, GT of 39 cultiv ars with TT-type of Wx gene ranged from 3.0 to 7.0 with the mean value of 5.2. So it was inferred that the locus controlling GT was not Wx locus.