5 years ago

Early flowering and rapid grain filling determine early maturity and escape from harvesting in weedy rice

Lei Dai, Zheng Zhang, Weimin Dai, Qiang Sheng, Song Xiaoling, Wenrong Xu, Can Zhao
BACKGROUND Early maturity is an important trait that is essential to the survival of weedy rice. To explore the mechanism of early maturity in weedy rice, the reproductive development of a large sample of weedy rice accessions and cultivars was compared in a common garden study. A selected sample of both weedy and cultivated rices was sown at different dates in two years to study in more detail their flowering and grain filling patterns. RESULTS The weedy rice from three major cropping regions matured 7–8 d earlier than their associated cultivars. Representative weedy rice accessions planted on conventional sowing dates flowered 3–26 d earlier than cultivars; delayed sowing caused divergence in the flowering regimes in weedy rice. However, regardless of the sowing date, weedy rice filled its grain 7–21 d faster than cultivars in both study years. Vegetative and reproductive traits of weedy and cultivated rice have different variation patterns with delayed planting. CONCLUSIONS Early maturity is an essential factor determining the persistence of weedy rice by contributing to its seed escaping of being harvested with the rice crop. Both early flowering and shorter grain filling stages determine early maturity, and the flowering is more plastic than the grain filling.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ps.4730

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