| Dynamic study on endogenous hormones and C/N ratio during flower\|bud differentiation of Li\|Guang Apricot |
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| DOI：10.7606/j.issn.1000-7601.2020.03.13 |
| Key Words: Li\|Guang Apricot flower\|bud differentiation endogenous hormone carbon to nitrogen ratio |
| Author Name | Affiliation | | ZHAO Tong | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Cuilian | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730070， China | | CHENG Li | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Jiqiang | Gansu Academy of Forestry Sciences, Lanzhou, Gansu 730070， China | | LIU Shenghu | Dunhuang Forestry Technology Promotion Center of Gansu Province, Dunhuang, Gansu 736200, China | | GUO Rong | Dunhuang Forestry Technology Promotion Center of Gansu Province, Dunhuang, Gansu 736200, China | | ZHU Zulei | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHU Yanfang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Yanxiu | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to clarify the time and characteristics of flower\|bud differentiation of Li\|Guang Apricot, and to study the regulation mechanism of flower\|bud differentiation, the time of flower\|bud differentiation was investigated by conventional paraffin\|section method and at the same time, the changes of endogenous hormones and mineral elements were determined in 2018. The differentiation of Li\|Guang Apricot was completed from June 20 to the early October. The process was divided into seven stages: undifferentiated stage, early differentiation stage, sepal differentiation stage, petal differentiation stage, stamen differentiation stage, pistil differentiation stage, and pollen cell stage. The peak period of differentiation was concentrated in August-September, and there were overlapping phenomena in all stages. In late June, with the beginning of morphological differentiation, the contents of ABA and CTK decreased and then maintained at a relative low level. The IAA content increased and peaked at 239 ng·g-1 in September and the ZR and GA values increased first and then decreased, and peaked at 64.8 ng·g-1 and 317 ng·g-1, respectively, in September. The ratios of ABA/IAA, ABA/GA, and ZR/IAA in June (undifferentiated stage) were significantly higher than those in other periods. The change of ZR/GA ratio showed a trend of first rising and then declining, with the highest value at 0.25 in July and the smallest value at 0.21 in September (pistil differentiation stage). The GA/IAA ratio peaked at 1.79 in June, and decreased gradually after entering the stage of morphological differentiation. The changes in ZR/ABA ratios showed a trend of rising first and then declining with the highest value at 0.24 in September. The contents of total nitrogen and carbon decreased continuously until the differentiation was completed in October. The C/N ratio increased first and then decreased. The results showed that the significant increase of ABA and CTK and the high ratio of ABA/IAA, ZR/IAA, and ABA/GA (The values were 3.75, 0.41,194, respectively) were beneficial to flower\|bud differentiation, and the increase of C/N ratio (37.31~54.79) was also beneficial to flower\|organ formation. When the ratio of carbon to nitrogen increased, it was beneficial to flower\|bud differentiation of Li\|Guang Apricot. |
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