A large replum-valve joint area is associated with increased resistance to pod shattering in rapeseed
2015
Hu, Zhiyong | Yang, Hongli | Zhang, Liang | Wang, Xinfa | Liu, Guihua | Wang, Hanzhong | Hua, Wei
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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