The Study On The Relationship Between Some Starch Synthase Related Genes And The Rice Quality

The granule-bound starch synthase (GBSS) , starch branching enzymes 1(SBE1) and 3(SBE3) are three major enzymes involved in starch biosynthesis in rice endosperm .The granule-bound starch synthase was encoded by the Wx gene ,and the starch branching enzymes were encoded by the sbe1 and sbe3 gene. Two populations were used in our research, one was a double-haploid (DH) population derived from a cross between the indica rice Nanjing 11 and the japonica rice Balilla, another one was a NIL population derived from a cross between the indica rice Guichao2 and the japonica rice Suyunuo. In our studies, the relationship between these starch-synthesizing genes (Wx, sbe1 and sbe3) and the rice quality was indicated by using the two populations. The results were summaried as following : there were some differences in the results when used two different populations, for example, the Sbe3 gene had a great effect and a significant interaction with Wx gene on the GC based on the DH population , the effect of the Sbe1 gene was not significant. But the significant effects of the Sbe1 gene were observed on the GC by using the NIL population. The results of two populations showed that, the Wx gene had significant effects on mainly rice quality values except the PKV . The sbe1 and sbe3 gene had different effects on different values of the RVA, the Sbe3 gene had a significant effect on the CSV by using the DH population , the Sbe1 gene had a significant effect on the HPV by using the NIL population.