| Effects of drought stress on endogenous hormone content in transplanted tissue culture potato seedlings |
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| DOI：10.7606/j.issn.1000-7601.2019.01.32 |
| Key Words: drought stress potato transplanted tissue culture seedling endogenous hormones content |
| Author Name | Affiliation | | Suyala Qiqige | College of Grassland, Resource, and Environment, Inner Mongolia Agricultural University, Hohhot 010019, China | | Fan Ming-shou | College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010018, China | | Jia Sha-sha | College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010018, China | | Kong Shuo | College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010018, China | | Jia Li-guo | College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010018, China |
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| Abstract: |
| In order to understand the mechanism of potato responses to drought stress, we used cultivars Shepody and Genyou No. 2 as experimental materials to investigate tuber formation and its endogenous hormone contents under drought stress in this study. The results showed that 50% mediumrelative water content exhibited negative effects on potato plant growth and tuberization, its tubers number and weight of per plant, the rate of potato-bearing plants and dry matter of whole plant were significantly lower than 65% mediumrelative water content, but with higherdistribution of dry matter in underground parts, increased by 31.75~36.42%(after transplanted 55 d) than 65%.In the process of tuberization, the GA content and GA/IAA, ZR/IAA, GA/ (IAA+ZR) ratio in stolon under 50% treatment were significantly lower than that under 65% treatment, lowered by 7.45%, 26.67%, 26.67% and 23.08% respectively; but the IAA contentsin stem and stolon were higher in 50% mediumrelative water content, increased by 1.67% and 22.25% respectively. The IAA content in all organs decreased firstly and then increased, but the ratios of GA/IAA, ZR/IAA, and GA/ (IAA+ZR) increased first and then decreased during tuberization. It is revealed that drought stress may induce new hormone balance in transplanted potato seedlings during tuber formation process, which might be an important mechanism of endogenous hormones as a signal in potato’s response to drought stress. |
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