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Drought Resistance of 10 Ground Cover Seedling Species during Roof Greening

Pengqian Zhang, Jiade Bai, Yanju Liu, Yuping Meng, Zheng Yang, Tian Liu
doi: https://doi.org/10.1101/711051
Pengqian Zhang
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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Jiade Bai
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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Yanju Liu
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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  • For correspondence: liuyanju@hotmail.com
Yuping Meng
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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Zheng Yang
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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Tian Liu
The Department of Ecology Research, Beijing Biodiversity Conservation Center, Nan Haizi, Daxing District, Beijing 100076, China
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Abstract

10 species’ drought resistance cases have been studied, including Paeonia lactiflora, Hemerocallis dumortieri, Physostegia virginiana, Iris lacteal, Hylotelephium erythrostictum, Sedum lineare, Iris germanica, Cosmos bipinnata, Hosta plantaginea and Dianthus barbatus. By researching these drought resistance cases, a suggestion can be given for roof greening. This research sets 3 drought stress scenarios by controlling the soil relative water content (RWC), including moderately drought stress (40%±2% < RWC < 45%±2%), strong drought stress (RWC < 30%±2%) and control group (RWC > 75%±2%). After the seedlings survived the drought stress, the damaging rate of permeability (DRP), total chlorophylls concentrations (Chl), superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (AsAPOD) of seedlings will be measured. Finally, a subordinate function method was applied to assess these species’ drought resistance. Cosmos bipinnata and Physostegia virginiana was dead after having suffered with moderately drought stress and strong drought stress, respectively. Although other species survived, the individual variation was huge especially for physiological and biochemical index. Hemerocallis dumortieri, Iris lactea and Hosta plantaginea’s DRP had little change when they lived in the normal water condition and suffered with drought stress. Most of the species (except Paeonia lactiflora and Sedum lineare) showed a lower SOD activity during moderately drought stress compared with the sufficient soil water condition and strong drought stress condition. The changes of plants’ POD activity and AsAPOD activity are very similar: when drought stress enhanced, the activity of protect enzyme reduced. According to the subordinate function method, the order of plants’ resistance to the drought is as follow: Hosta plantaginea > Sedum lineare > Iris germanica > Hemerocallis dumortieri > Iris lactea >Hylotelephium erythrostictum > Dianthus barbatus > Paeonia lactiflora > Physostegia virginiana > Cosmos bipinnata.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted July 22, 2019.
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Drought Resistance of 10 Ground Cover Seedling Species during Roof Greening
Pengqian Zhang, Jiade Bai, Yanju Liu, Yuping Meng, Zheng Yang, Tian Liu
bioRxiv 711051; doi: https://doi.org/10.1101/711051
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Drought Resistance of 10 Ground Cover Seedling Species during Roof Greening
Pengqian Zhang, Jiade Bai, Yanju Liu, Yuping Meng, Zheng Yang, Tian Liu
bioRxiv 711051; doi: https://doi.org/10.1101/711051

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