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| Evaluation of low temperature germinabilityof 377 national rice accessions |
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| DOI：10.16768/j.issn.1004-874X.2017.04.001 |
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| Abstract: |
| The poorer low temperature germinability（LTG）of rice cultivars in the early cropping-season
is one of the main factors limiting direct seeding in the double cropping regions in South China. Screening rice
germplasm with strong LTG and breeding rice variety with strong LTG is the most economical and effective way to
solve this issue. To identify rice germplasm with strong LTG，377 rice accessions from 56 countries and regions
were subjected to 13℃ and their germination rates at low temperature were evaluated. The results showed that LTG
of these rice accessions varied from 0 to 98.0% and the average germination rate was 37.6% with 76.4% of variation
coefficient. 21 accessions had a LTG over 90%. Significant differences in LTG were observed among the three types
of rice，indica，Aus and japonica. The average LTG of indica was highly significantly higher than that of japonica
and Aus（ P ＜ 0.01），respectively，and the average LTG of japonica was significantly higher than that of Aus（ P
＜ 0.05）. The results provide a good basis for screening of rice germplasm with strong low temperature germinabilityand the 21 rice accessions with LTG over 90% could be good materials for breeding and gene discovery associated
with strong low temperature germinability in rice. |
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