Journal
PEST MANAGEMENT SCIENCE
Volume 74, Issue 2, Pages 465-476Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.4730
Keywords
weedy rice; flowering time; grain-filling stage; sowing date; early maturity
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Funding
- China Transgenic Organism Research and Commercialization Project [2016ZX08011-001]
- National Key Research and Development Program [2016YFD0200805]
- Agrotechnical Innovation Projects of Jiangsu Province [SXGC(2016)S321600-17]
- Recruitment Program of Foreign Experts of Jiangsu Province
- University Featured Program - Ministry of Education
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BACKGROUNDEarly 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 rice was sown at different dates in two years to study in more detail their flowering and grain-filling patterns. RESULTSThe weedy rice from three major cropping regions matured 7-8 days earlier than their associated cultivars. Representative weedy rice accessions planted on conventional sowing dates flowered 3-26 days 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 days faster than cultivars in both study years. Vegetative and reproductive traits of weedy and cultivated rice have different patterns of variation with delayed planting. CONCLUSIONEarly maturity is an essential factor determining the persistence of weedy rice by contributing to the escape of its seed from being harvested with the rice crop. Both early flowering and shorter grain-filling stages determine early maturity, and flowering is more plastic than grain filling. (c) 2017 Society of Chemical Industry
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