| Effects of water deficit on potato growth, development and carbon metabolism at the seedling stage |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2025.02.08 |
| Key Words: potato seedling water deficit rehydration carbohydrate metabolism growth |
| Author Name | Affiliation | | CHEN Hong | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | GUO Yan | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | GUAN Ting | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | LIU Peng | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | FAN Mingshou | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | JIA Liguo | College of Agronomy, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China |
|
| Hits: 4 |
| Download times: 0 |
| Abstract: |
| In this experiment, three water irrigation gradients were applied at the seedling stage: full irrigation (M65), mild deficit (M50), and severe deficit (M35). The leaf area index and biomass were measured throughout the growth stage, while yield and its components were assessed at the maturity stage. Additionally, the activities of sucrose synthase (SS-synthesis direction), sucrose phosphate synthase (SPS), ADP-glucose pyrophosphorylase (AGPase), and starch synthase (SSS) were analyzed, along with changes in the content of carbon metabolites, sucrose, and starch. The results showed that the leaf area index and biomass of potato were significantly higher than those of the control group after rewatering under mild water stress at the seedling stage, which were 29.11% and 13.21% higher at the starch accumulation stage, respectively, and the yield was also significantly higher than that of the control. Under water stress, the SS-synthesis direction and AG-Pase activity in leaves were significantly enhanced, and the mild deficit treatment increased by 264.91% and 762.39%, respectively, and the severe deficit treatment increased by 144.94% and 251.28%, respectively. The activity of SPS in leaves was significantly reduced, with mild deficiency treatment decreasing by 47.16% and severe deficiency treatment decreasing by 83.01% compared with the control treatment. There was no significant difference in SSS activity between mild deficiency treatment and control, and severe deficiency treatment was significantly lower than that of control. The contents of sucrose and starch in mildly deficient treatment leaves increased significantly by 1.81% and 19.70%, respectively, compared with the control. After rewatering, the activities of SPS, SS-synthesis direction and AG-Pase in mildly deficient treatment leaves were restored to the control level, and the starch content decreased significantly by 38.14%~69.69%, restoring the supply capacity of the source. Compared with the control, the SSS activity in the mildly deficient treatment tubers increased by 29.72%, and the other enzyme activities returned to the control level, and the contents of sucrose and starch increased, which enhanced the activity of the reservoir. There was a significant positive correlation between sucrose and starch content in potato leaves, and a significant positive correlation between starch content and AG-Pase and SSS activities in tubers. The results demonstrated that a moderate water deficit followed by rewatering during the potato seedling stage reconstructed the source\|sink relationship, enabling compensatory plant growth and contributing to higher potato yield and improved water\|use efficiency. |
|
|
|