Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 1, Pages 76-81Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1213041110
Keywords
PGMS line; hybrid breeding; sugar partitioning
Categories
Funding
- National Natural Science Foundation of China [30830014]
- Ministry of Science and Technology, China [2013CB126902, 2011CB100101, 2011AA10A101, 2012AA10A302]
- Science and Technology Commission of Shanghai Municipality [10JC1406400, 10DZ2294100, 11JC1404900]
- National Transgenic Major Program [2011ZX08009-003-003, 2009ZX08009-108B]
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Rice is a major staple food worldwide. Making hybrid rice has proved to be an effective strategy to significantly increase grain yield. Current hybrid rice technologies rely on male sterile lines and have been used predominantly in indica cultivars. However, intrinsic problems exist in the implementation of these technologies, such as limited germplasms and unpredictable conversions from sterility to fertility in the field. Here, we describe a photoperiod-controlled male sterile line, carbon starved anther (csa), which contains a mutation in an R2R3 MYB transcription regulator of pollen development. This mutation was introduced into indica and japonica rice, and it rendered male sterility under short-day conditions and male fertility under long-day conditions in both lines. Furthermore, F-1 plants of csa and a restorer line JP69 exhibited heterosis (hybrid vigor), suggesting the feasibility of using this mutation to create hybrid rice. The csa-based photoperiod-sensitive male sterile line allows the establishment of a stable two-line hybrid system, which promises to have a significant impact on agriculture.
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