| Seed germination characteristics and drought resistance evaluation of four annual plants under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2025.05.03 |
| Key Words: desert herbaceous plant annual plant drought stress germination characteristics drought resistance evaluation |
| Author Name | Affiliation | | XIAO Bin | Gansu Desert Control Resesrch Institiute, Lanzhou, Gansu 730070, China | | GUO Shujiang | Gansu Desert Control Resesrch Institiute, Lanzhou, Gansu 730070, China
Gansu Linze Desert Ecosystem National Observation and Research Station, Linze, Gansu 734200, China | | LI Ya | Gansu Desert Control Resesrch Institiute, Lanzhou, Gansu 730070, China | | LI Delu | Gansu Desert Control Resesrch Institiute, Lanzhou, Gansu 730070, China | | WANG Fei | Gansu Desert Control Resesrch Institiute, Lanzhou, Gansu 730070, China
Gansu Minqin National Studies Station for Desert Steppe Ecosystem, Minqin, Gansu 733300, China |
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| Abstract: |
| This study aimed to investigate the effects of drought stress on seed germination of annual desert herbaceous plants. The seeds of Bassia dasyphylla, Halogeton arachnoideus, Agriophyllum squarrosum, and Eragrostis pilosa in the Minqin Desert Oasis Transitional Zone were used as experimental materials. PEG-6000 of different concentrations was applied to simulate drought stress. The response of germination indicators, growth indicators,and germination recovery rate of four annual herbaceous plant seeds to drought stress was analyzed, and the drought resistance of four plant seeds was evaluated comprehensively by the subordinate function method. The results showed that: (1) As PEG-6000 concentration increased, the germination indices of all four plant species declined significantly. When PEG-6000 concentrations were≥20%, 30%, 10%,and 30%, seed germination of B. dasyphylla, H. arachnoideus, A. squarrosum, and E. pilosa was significantly inhibited. Compared to the control, their germination rates decreased markedly by 14.66%~99.14%, 65.71%~83.81%, 5.00%~95.00%, and 44.86%~73.83%, correspondingly.The germination potential and germination index of A. squarrosum seeds were significantly higher than those of the other three species (P<0.05), while the vitality index of H. arachnoideus and B. dasyphylla seeds was significantly higher than that of the other two species (P<0.05).(2) The germ length, radicle length, and fresh mass of four plant seeds decreased with increasing PEG-6000 concentrations. When PEG-6000 concentration was ≥10%, the growth indicators of B. dasyphylla, H. arachnoideus, A. squarrosum, and E. pilosa seeds were significantly inhibited, showing reductions of 21.57%~98.24%,17.48%~87.91%, 16.64%~89.58%, and 12.86%~94.87%, respectively, compared to the control group. (3) After drought stress relief, recovery germination rates varied among the species, ranked as B. dasyphylla > E. pilosa > A. squarrosum > H. arachnoideus. Seeds of B. dasyphylla, H. arachnoideus, and A. squarrosum could resume germination at PEG concentrations of 5%~25%, while E. pilosa seeds exhibited recovery germination across all tested concentrations.(4) The drought resistance of the seeds of four plants during germination was as follows: H. arachnoideus > A. squarrosum > B. dasyphylla > E. pilosa. |
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