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, 11 (12), e0168483

Relationship of Rice Grain Amylose, Gelatinization Temperature and Pasting Properties for Breeding Better Eating and Cooking Quality of Rice Varieties


Relationship of Rice Grain Amylose, Gelatinization Temperature and Pasting Properties for Breeding Better Eating and Cooking Quality of Rice Varieties

Yunlong Pang et al. PLoS One.


A total of 787 non-waxy rice lines- 116 hybrids and 671 inbreds-were used to study the apparent amylose content (AAC), gelatinization temperature (GT), and rapid visco analyzer (RVA) pasting viscosity properties of rice starch to understand their importance in breeding better rice varieties. The investigated traits showed a wide range of diversity for both hybrid (HG) and inbred (IG) groups. The combinations of the different categories of AAC and GT were random in HG but were non-random in IG. For inbred lines, the high level of AAC tended to combine with the low level of GT, the intermediate level of AAC tended to have high or intermediate GT, and the low level of AAC tended to have high or low GT. Some stable correlations of the AAC, GT, and RVA properties may be the results derived from the physicochemical relationships among these traits, which rice breeders could utilize for selection in advanced breeding generations. Through cluster analysis, IG and HG were divided into 52 and 31 sub-clusters, respectively. Identifying the cultivars having AAC, GT, and RVA properties similar to that of popular high-quality rice varieties seems to be an interesting strategy and could be directly used for adaptation trials to breed high-quality rice varieties in targeted areas in a more customized manner.

Conflict of interest statement

The authors have declared that no competing interests exist.


Fig 1
Fig 1
Histogram distributions of AAC and GT in inbred (A and B) and hybrid groups (C and D). H, I, L, and VL were high, intermediate, low, and very low, respectively.
Fig 2
Fig 2. Correlation relationships of AAC and RVA parameters in inbred and hybrid groups.
The values were correlation coefficients (r) multiplied by 100. The areas and colors of ellipses showed the absolute value of corresponding r. Right and left oblique ellipses indicated positive and negative correlations, respectively. The values without glyphs indicated insignificant at 0.05.

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Grant support

This research was supported by grant to ZL on "Green Super Rice project for resource poor rice farmers in Africa and Asia" from Bill & Melinda Gates Foundation (OPP1130530-1). The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.