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A large replum-valve joint area is associated with increased resistance to pod shattering in rapeseed

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Abstract

The structure of the replum was studied in 64 rapeseed lines and in an F2 population derived from a cross between a high pod shattering resistance line, zy72360, and a susceptible line, R1. The dimensions of the replum close to the pedicel in lines with high silique shattering resistance index (SSRI) were greater than those with low SSRI. The replum-valve joint area index (RJAI) was used to investigate the relationship between the replum size and pod shattering. In the 64 accessions, RJAI displayed wide variation (0.50–4.12 mm2), with a variance coefficient of 45.4 %. There were highly significant positive correlations between SSRI and RJAI, with a correlation coefficient of 0.6140. Analysis of RJAI in 276 F2 individuals further validated the positive correlations between SSRI and RJAI. These results revealed that replum structure was highly associated with pod shattering, and that a thick replum structure could produce high pod shatter resistance. The replum-valve joint area offers a good method to screen high resistance materials beneficial for breeding.

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Abbreviations

RJAI:

Replum-valve joint area index

SAS:

Statistical analysis system

SSRI:

silique shattering resistance index

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (31201241), the Industry Technology System of B. napus in China (CARS-13), Wuhan Chenguang Project (201271031411 and 2013020501010175) and the Hubei Agricultural Science and Technology Innovation Center of China.

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Correspondence to Wei Hua.

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10265_2015_732_MOESM1_ESM.tif

Distribution of silique shattering resistance index and replum-valve joint area index in rapeseed. a Distribution of silique shattering resistance index of 64 rapeseed lines. b Distribution of replum-valve joint area index of 64 rapeseed lines. c Distribution of replum-valve joint area index of the F2 population, which includes 276 individuals derived from a cross between zy72360 and R1. (TIFF 1598 kb)

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Hu, Z., Yang, H., Zhang, L. et al. A large replum-valve joint area is associated with increased resistance to pod shattering in rapeseed. J Plant Res 128, 813–819 (2015). https://doi.org/10.1007/s10265-015-0732-9

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  • DOI: https://doi.org/10.1007/s10265-015-0732-9

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