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| Genetic Basis of Direct Seeding Adaptability in Rice and its Breeding Strategy |
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| DOI：10.16768/j.issn.1004-874X.2022.01.001 |
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| Abstract: |
| Rice is one of the most important food crops in the world. With the decrease of rural labor force and the
rapid increase of labor cost, rice production is shifting from transplanting to direct seeding. Despite the multiple advantages
over transplanting, high production risk still exists in direct seeding rice and the yield is not high and unstable due to lack
of direct-seeding varieties. There are three crucial problems in the production of rice direct seeding, such as poor seedling
establishment, severe weed infestation and being susceptible to lodging. It is urgent to develop direct-seeding varieties
which have the traits of tolerance to anaerobic germination and low temperature germination, strong early vigor, herbicide
resistance and lodging resistance. Many QTL or genes have been identified for the traits of anaerobic germination tolerance,
low temperature germination tolerance, herbicide resistance and lodging resistance. Some genes such as OsTPP7, OsCBL10,qLTG3-1, HIS1 and SCM2 have been successfully cloned, providing important gene resources for molecular breeding. In this
review, based on the traits related to direct seeding adaptability, such as anaerobic germination tolerance, low temperature
germination tolerance, herbicide resistance and lodging resistance, the rice genetic basis of direct seeding adaptability and the
utilization status of the key genes controlling direct seeding adaptability and related genes were summarized. It is suggested
that the development of direct-seeding rice varieties need an integrated use of modern molecular breeding and conventional
breeding methods to achieve rapid and efficient pyramiding of multiple genes/traits in direct-seeding varieties, with a view to
guaranteeing a sustainable development of direct-seeding rice. |
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