Journal
NEW PHYTOLOGIST
Volume 206, Issue 4, Pages 1491-1502Publisher
WILEY-BLACKWELL
DOI: 10.1111/nph.13319
Keywords
crossover; environmental stimuli; meiotic recombination; Oryza sativa; uneven distribution
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Funding
- National Natural Science Foundation of China (NSFC) [91331205, 31271678, J1103512, J1210026]
- NSFC of Jiangsu province [BK2011015]
- Changjiang Scholars and Innovative Research Team in University [IRT_14R27]
- New Century Excellent Talents in University [NCET-12-0259]
- Scientific Research Foundation of Graduate School of Nanjing University [2013CL12]
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Numerous studies have argued that environmental variations may contribute to evolution through the generation of novel heritable variations via meiotic recombination, which plays a crucial role in crop domestication and improvement. Rice is one of the most important staple crops, but no direct estimate of recombination events has yet been made at a fine scale. Here, we address this limitation by sequencing 41 rice individuals with high sequencing coverage and c. 900000 accurate markers. An average of 33.9 crossover (c. 4.53cMMb(-1)) and 2.47 non-crossover events were detected per F-2 plant, which is similar to the values in Arabidopsis. Although not all samples in the stress treatment group showed an increased number of crossover events, environmental stress increased the recombination rate in c. 28.5% of samples. Interestingly, the crossovers showed a highly uneven distribution among and along chromosomes, with c. 13.9% of the entire genome devoid of crossovers, including 11 of the 12 centromere regions, and c. 0.72% of the genome containing large numbers of crossovers (>50cMMb(-1)). The gene ontology (GO) categories showed that genes clustered within the recombination hot spot regions primarily tended to be involved in responses to environmental stimuli, suggesting that recombination plays an important role for adaptive evolution in rapidly changing environments.
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