QTL Mapping and Q×E Interactions of Grain Cooking and Nutrient Qualities in Rice Under Upland and Lowland Environments

Yongmei Guo^{a, b, #},
Ping Mu^{a, #},
Jiafu Liu^c,
Yixuan Lu^b,
Zichao Li^{a
, ,}

a.
Key Laboratory of Crop Genomics and Genetic Improvement of Ministry of Agriculture, Key Laboratory of Crop Heterosis and Utilization of Ministry of Education, Beijing Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100094, China
b.
Institute of Food Crop Research, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
c.
Quality and Test Center of Agricultural Administration, Yunnan Academy of Agricultural Sciences, Kunming 650201, China

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Corresponding author: E-mail address: lizichao@cau.edu.cn (Zichao Li)

These authors contributed equally to this work.

摘要

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Abstract: Grain cooking and nutrient qualities are the most important components of rice (Oryza sativa L.) quality. A doubled haploid (DH) population from a cross between two japonica cultivars was used to examine the phenotypic values and potential QTLs for the quality traits. The cooking and nutrient quality traits, including the amylose content (AC), the gel consistency (GC), the gelatinization temperature (GT), and the protein content (PC), in rice grown under upland and lowland environments were evaluated. Significant differences for AC, GC, GT, and PC between upland and lowland environments were detected. The phenotypic values of all four traits were higher under upland environment than lowland environment. The value of PC under upland environment was significantly higher (by 37.9%) than that under lowland environment. This suggests that upland cultivation had large effect on both cooking and nutrient qualities. A total of seven QTLs and twelve pairs of QTLs were detected to have significant additive and epistatic effects for the four traits. Significant Q × E interaction effects of two QTLs and two pairs of QTLs were also discovered. The general contribution of additive QTLs ranged from 1.91% to 19.77%. The Q × E interactions of QTLsQGt3 and QAc6 accounted for 8.99% and 47.86% of the phenotypic variation, respectively, whereas those of the 2 pairs of epistatic QTLs, QAc6-QAc11b and QAc8-QAc9, accounted for 32.54% and 11.82%, respectively. Five QTLs QGt6b, QGt8, QGt11, QGc1, and QPc2, which had relatively high general contribution and no Q × E interactions, were selected to facilitate the upland rice grain quality breeding.
- upland rice /
- cooking quality /
- nutrient quality /
- QTL mapping /
- Q × E interaction effects
These authors contributed equally to this work.
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