Japonica rice germplasm resources alkali resistance identification conditions and indicators
Cheng Guangyou et al. studied the height, tiller number and total number of green leaves of rice under different alkali stress intensities, and pointed out that it is more suitable for the alkali tolerance screening of rice varieties under pH 8. 6 alkali stress conditions, and believes that rice seedlings The 4th and 8th weeks after transplanting were the best time for rice alkali tolerance identification. Liang Zhengwei et al. found that the number of rice tiller and heading date are the measures of rice salt-tolerant alkaline traits by comparing phenotypic traits such as plant height, stem number, heading, heading, date of full heading, culm length, and internode length. Better indicators.
The related studies showed that the pH 9·4 alkali stress condition had a greater effect on the dead-leaf rate of Japonica germplasm resources than the pH 8.9 alkali stress condition, but the pH 8·9 alkali stress was more conducive to carry out alkali resistance of japonica rice germplasm resources. Identification screening, which is similar to the results of Cheng Guangyou et al. In 2008, pH 8·9 alkali stress on the 16th to 26th days, in the range of 20% to 100% dead leaf rate, its frequency distribution showed a nearly normal continuous distribution, and its variance and coefficient of variation were large, so it was considered that in 2008 pH8·9 alkali stress was suitable for the alkali-tolerance identification period of indica rice germplasm resources from the 16th to the 26th day, which was the best time for rice alkali tolerance identification after the 4th week after transplanting rice seedlings of Cheng Guangyou et al. The views are somewhat similar. Guo Wangmo et al. showed that the salt-tolerance capacity of the same rice cultivar at the bud and seedling stages was different, and the seeds showed relatively salt tolerance during germination. Kbar et al. pointed out that as the plant grows and develops, it enters the vegetative growth stage, gradually increases its tolerance to salinity, and becomes sensitive to saline-alkali stress in the reproductive growth stage. Therefore, further research is needed on the identification conditions and indicators of rice alkali resistance and the optimal identification period.
The germplasm resource bank can use equipment to control the storage environment and store the crop germplasm for a long period of time. Also known as the gene bank. The germplasm resource bank of crops can preserve and collect seeds of various crop varieties and store them scientifically, which is of great significance for improving varieties and breeding new varieties with high yield, high quality, and strong resistance.
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