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| Screening of high temperature resistant strains ofrice during heading and flowering period |
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| DOI：10.16768/j.issn.1004-874X.2017.02.001 |
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| Abstract: |
| In order to know the high temperature resistance of R6258，Rgu-1 and other new recovery varieties
during heading and flowering period，we studied the seed setting rate of new rice lines under the condition of abnormal
high temperature during heading and flowering stage，by high temperature resistance identification technology. The
results showed that after treatment for 11 d at more than 35℃ in flowering stage ，there were significant differences
in seed setting rate among rice varieties and among lines. For standard resistance parameter，there was the order
of RHTs Ⅱ you 838，Rgu-1，R6258，R362，Rdong 005，Jinyougui 99，R21-1；for the competition resistance
parameters，there was the order of RHTC Ⅱ you 838，Rgu-1，R6258，R362，Rdong 005，R21-1，Jinyougui 99.
The seed setting rate of Rgu-1 and R6258 was not significantly different from Ⅱ you 838，while significantly higher
than that of Jinyougui 99. The resistance parameters of Rgu-1 were 0.801 and 0.976，of R6258 were 0.788 and 0.947，
were similar to these of Ⅱ you 838（ 0.808 and 1），indicating that Rgu-1 and R6258 had strong resistance to high
temperature during heading and flowering period. Rice line Rgu-1 and R6258 can be used as resistant germplasm
resources for breeding resistant rice varieties. |
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