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Enhance the efficiency of haploid breeding and the character of fertility reversal of sterile pollen plants in photosensitive male sterile rice



Enhance the efficiency of haploid breeding and the character of fertility reversal of sterile pollen plants in photosensitive male sterile rice



Acta Genetica Sinica 20(2): 167-173



The effect of different generation (F-1 and F-2) in the combination which was photosensitive male sterile (P-ms) crossed a normal rice, as the donor plants used for anther culture on the ratio of male sterile pollen plant (MSPP) to the total pollen plant (TPP) was studied. The result showed that if F-1 was used as the donor plant for anther culture, in long day condition, the frequency of MSPPs making up to the TPPs was around 20%. But the corresponding frequency from F-2 as the donor plants was around 90%. The efficiency of 3-4 fold for MSPP was raised if male sterile plant segregated in F-2 were selected and used as the donor plants for anther culture. The authors point out that double selections should be undertaken in F-2 generation if the breeding goal is to develop a new photosensitive ms line. One is to select ms plants segregated from F-2 generation in long-day condition (LDC) and the other is to select the individual which could be well tuned into fertility from male sterile in short day condition (SDC). In other worlds, the plants selected as the donor plants in F-2 generation should be male sterile in LDC and fertile in SDC. The result in this experiment showed that the fertile reversal of MSPPs under same combination was different. According to the expressions of fertile reversal of MSPP in SDC, they could be divided into three groups. 1) Sterility of the MSPPs in this group could be reversed fertile. The pollen grains of MSPP could be stained by I-KI solution during September and October in Guangzhou and the frequency of staining pollens were higher and stable, and the plants in this group possessed the characters of photosensitive male sterile rice. 2) The frequency of staining pollens of the MSPPs in this group was low and unstable or the date of fertility reversal was very late (after October), and they had the characters of photo-thermo interactional sensitive male sterile rice. 3) The fertility reversal of MSPPs in this group was not observed during the whole stage of SDC. The frequency of staining pollen was zero or less than 10%, they showed the characters of thermosensitive male sterile rice. It is worth, to note that this result is completely in correspondence with the one from the expressions of the 15 P-ms lines collected from the whole country. It is concluded that a photo-, thermo- or photo/thermo-interactive sensitive male sterile line might be bred by anther culture method from a specific hybrid combination (P-ms rice/normal variety rice).

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