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QTL mapping of panicle architecture and yield-related traits between two US rice cultivars 'LaGrue' and 'Lemont'

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Abstract

Grain yield is a quantitative trait, which is determined by several agronomic traits. Unfortunately, there is little information about the genetics behind yield components in US rice cultivars. The objectives of the present study were to (1) conduct a QTL study to identify chromosome (chr. hereafter) regions associated with yield traits in two U.S.-developed rice cultivars and (2) identify candidate genes in major QTL regions related to yield traits. Four rice cultivars were evaluated in summer 2017 at the University of Arkansas System Division of Agriculture's Rice Research and Extension Center (RREC) at Stuttgart, AR. for 15 agronomic traits associated with yield. Of the four cultivars, "LaGrue" had a higher number of seeds/panicle, number of primary panicle branches/panicle, and number of seeds/plant and "Lemont," despite having longer panicles and higher 100 seed weight/panicle, produced the least number of seeds among the cultivars. A bi-parental population was developed from a cross between LaGrue and Lemont for QTL analysis. A set of 322 F2:3 lines were evaluated in a randomized complete block design (RCBD) for several agronomic traits at two locations with three replications for each line. A total of 17 major QTL were detected, including two major QTL for plant height on chr. 1 and two major QTL for flag leaf length and panicle length on chr. 8 with seven candidate genes found in these regions. The results from the study would be useful for marker-assisted selection in rice breeding.

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Abbreviations

DTHDT:

Days to 50% heading

FLLT:

Flag leaf length

FWD:

Flag leaf width

PBN:

Primary branch number

PlntHt:

Plant height

PnL:

Panicle length

SBN:

Secondary branch number

Sp/Pl:

Number of spikelets/panicle

Sd/Pl:

Number of seeds/panicle

chr.:

Chromosome

cM:

CentiMorgan

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Acknowledgements

This work was supported in part by funding provided by the rice farmers of Arkansas and administered by the Arkansas Rice Research and Promotion Board. We thank Mr. Thomas Colman and Mr. Daniel Wood for their help.

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Correspondence to Ehsan Shakiba.

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Conflict of interest

The authors declare: (1) This material is the authors' original work, which has not been previously published elsewhere. (2) The paper is not currently being considered for publication elsewhere. (3) The paper reflects the authors' research and analysis truthfully and completely. (4) The paper properly credits the meaningful contributions of co-authors and co-researchers. (5) The results are appropriately placed in the context of prior and existing research. (6) All sources used are properly disclosed (correct citation). (7) All authors have been personally and actively involved in substantial work leading to the paper and will take public responsibility for its content. (8) We have no conflicts of interest to disclose. (9) We did not conduct any harmful activities on humans or animals or use any blood product or microorganisms.

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Rice, A.D., North, D.G., Moldenhauer, K.A.K. et al. QTL mapping of panicle architecture and yield-related traits between two US rice cultivars 'LaGrue' and 'Lemont'. Euphytica 218, 7 (2022). https://doi.org/10.1007/s10681-021-02940-7

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  • DOI: https://doi.org/10.1007/s10681-021-02940-7

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