Marker and method for identifying cytoplasmic sterility homozygous restorer line of Gossypium harknessii
A technology for Harknessy cotton and homozygous restorer lines, which is applied in the field of identification of markers for homozygous restorer lines of Harknessy cotton cytoplasmic sterility, can solve the problems of poor accuracy, large consumption, long time required, and the like, Achieve the effect of high accuracy, fast speed and improved accuracy
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[0022] Material preparation and method:
[0023] (1) (19R × Jinmian 50) BC 3 F 2 : The cytoplasmic sterile restorer line of Harknessy cotton was used as the female parent, and Jinmian 50 was used as the male parent (recurrent parent). After crossing with the restorer line for one generation and backcrossing for three generations, BC 3 F 1 Fertile plants in segregating populations are selfed to obtain BC 3 F 2 separate groups.
[0024] (19R×GK44)F 2 : Taking the restorer line of Harknessey cotton cytoplasmic sterility as the female parent and GK44 as the male parent, after crossing with the restorer line for 2 generations, (19R×GK44)F was obtained 2 .
[0025] (2) Pollen fertility survey: The fertility survey method refers to the method of Justus (Justus N, Leinweber CL. A heritable partially male sterile character in cotton. J Hered (1960) 51 (4): 191-192), using hand twist Whether pollen grains appear in broken anthers is the criterion for distinguishing fertile and s...
Embodiment 1
[0028] In the summer of 2010, it was planted on the farm of the Cotton Research Institute of Shanxi Academy of Agricultural Sciences (19R × Jinmian 50) BC 3 F 2 Divide colonies and plant 8 rows of 23-25 plants each. Since the female parent is derived from a restorer line with cytoplasmic sterility, fertility segregation occurs in the progeny. There are 196 isolates in this segregated population. First, the anthers were broken to identify the fertility of a single plant. Among them, 125 were fertile plants, and among the fertile plants , a total of 48 individual strains amplified by the SSR marker NAU5121 primer with an amplified band at 170 bp and without an amplified band at 190 bp were selected.
[0029] In the winter of 2010, field test-crossing and identification of the above-mentioned individual plants with 170 bp amplification band and no 190 bp amplification band were carried out in Hainan. The results showed that 47 of them were confirmed to be homozygous restorer p...
Embodiment 2
[0031] Planted on the farm of the Cotton Research Institute of Shanxi Academy of Agricultural Sciences in the summer of 2010 (19R×GK44)F 2 Divide colonies and plant 20 rows of 23-25 plants each. There were 483 plants in this isolated population, and DNA was extracted from each individual plant of the isolated population before flowering. In this isolated population, a total of 349 individual strains with two amplified bands at 1200 bp and 1045 bp amplified by the marker PF1 primer, 126 strains with only 1045 bp band type, and 126 strains with no amplified band type 8 strains, see PCR amplification results figure 1 ; 349 strains were identified by SSR marker NAU5121 primer in the second round, and there were 117 individual strains with 170 bp amplification band and no 190 bp amplification band. The PCR amplification results are shown in figure 2 , 117 individual plants were test-crossed and combined with sterile lines.
[0032] In the winter of 2010 in Hainan, the above-...
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