TITLE:
Study on the Response and Recovery Characteristics of Different Herbaceous Peony (Paeonia lactiflora Pall.) Varieties to Waterlogging Stress
AUTHORS:
Qingxia Zhang, Dongliang Zhang, Anqi Xie, Jinguang Xu, Xue Li, Yang Li, Zemiao Liu, Xia Sun
KEYWORDS:
Herbaceous Peony, Waterlogging, Photosynthesis, Chlorophyll Fluorescence, Structure Microhumid, Lutein Cycle
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.12 No.9,
September
16,
2021
ABSTRACT: The root of herbaceous peony (Paeonia lactiflora Pall.) is fleshy, and different varieties have
different tolerance to waterlogging stress. In order to explore its response
and recovery characteristics to waterlogging stress, six varieties of herbaceous
peony with strong, medium and weak waterlogging tolerance and high ornamental
value were selected as experimental materials. After the vegetative growth of
each variety was completed, the field simulated waterlogging stress experiment
was carried out by the semi-flooded (the water surface is half the height of
the flowerpot) pot method. Changes in photosynthetic parameters, chlorophyll fluorescence parameters, relative water content (RWC),
relative conductivity (REC), chlorophyll content, lutein cycle, and leaf
microstructure were analyzed during recovery from waterlogging stress and
stress relief. The results showed that the time of reaching the most
significant difference between CK and tested varieties was different. From the
beginning of stress to 60% of the leaves
with symptoms, the varieties with strong and moderate waterlogging
tolerance experienced longer time; the proportion of palisade tissue in leaves
was larger; the maximum photochemical quantum yield (Fv/Fm) was reduced less;
it could increase xanthophyll cycle and heat dissipation (NPQ) to consume excess light energy, and maintain a higher net
photosynthetic rate (Pn) for normal growth of plants in a short period
of time. The REC in leaves of varieties with weak waterlogging tolerance
increased more, and the damage of cell membrane was more serious. After the
stress was removed, all indexes recovered to different degrees. Based on our
comprehensive analysis, the comprehensive waterlogging resistance of the
experimental materials followed the pattern: “Lihong” > “Yangfeichuyu” > “Taohuafeixue”
> “Dafugui” > “Qihualushuang” > “Hongxiuqiu”. It is suggested that the variety “Lihong” and “Yangfeichuyu”, with
strong comprehensive waterlogging tolerance, can be selected for
propagation and cultivation in areas prone to waterlogging. In the later stage,
it is still necessary to further expand the number and scale of varieties,
combined with the in-depth study of waterlogging-resistance
genes, so as to provide a theoretical reference for the cultivation and
production of new waterlogging-resistant varieties.