| Effects of drought stress on endogenous hormone contents of different root\|type alfalfa |
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| DOI：10.7606/j.issn.1000-7601.2022.03.04 |
| Key Words: drought stress alfalfa root type endogenous hormone biomass |
| Author Name | Affiliation | | WANG Kun | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | NAN Lili | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LI Jingfeng | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LIANG Pengfei | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | CHEN Jie | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | WEI Shaoping | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LIU Xin | College of Pruatacultural Science, Gansu Agricultural University， Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The indole acetic acid (IAA), gibberellin A3(GA3), zeatin (ZT) and abscisic acid (ABA) contents in rhizomatous rooted, tap rooted, and creeping rooted alfalfa on the aboveground and underground after drought stress were determined by the method of high\|performance liquid chromatography (HPLC) in the current and following years. The relationship between these endogenous hormones and drought resistance of different root\|type alfalfa was studied. The results showed that with the intensification of drought stress, the aboveground and underground IAA and ZT contents of rhizomatous rooted, tap rooted and creeping rooted alfalfa decreased significantly during the sowing year and the following growth year. Compared with CK, the annual average decrease of IAA was 50.09%, 36.52%, 49.15% and 58.17%, 53.42%, 56.62% respectively, and the decrease of ZT was 38.11%, 52.57%, 36.18% and 43.86%, 63.94%, 54.17% respectively. The content of ABA increased significantly, but the rate of increase was gradually declined with the extension of growth years. The increase rates in the sowing year and the following year were 62.50%~358.82% and 19.70%~85.19% respectively. However, GA3 contents remarkedly decreased during the sowing year, whereas GA3 contents reached the highest level under the moderate and severe stress during the following year. The GA3/ABA, IAA/ABA, (IAA+GA3+ZT)/ABA, and aboveground and underground dry mass decreased under drought conditions during the sowing year. The aboveground and underground IAA/ABA significantly decreased by 68.63%~70.69% and 76.77%~88.65% respectively, and GA3/ABA and (IAA+GA3+ZT)/ABA increased first and then decreased during the following next year. The GA3/ABA, IAA/ABA, and (IAA+GA3+ZT)/ABA were lowest in rhizomatous rooted alfalfa and were highest in tap rooted alfalfa under the same drought stress. There were positive correlations between dry weight of aboveground part and GA3, IAA, and ZT contents in leaves and stems as well as between dry weight of underground part and GA3, IAA, and ZT contents in roots while ABA content in leaves and stems and in roots was negatively correlated with dry weight of aboveground part and underground part, respectively. Therefore, rhizomatous rooted and creeping rooted alfalfa had better adaptability to drought stress. |
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