e adaptability of plants to drought not only includes their ability to resist
drought stress, but also their ability to recover aer stress is relieved. In this study,
a weighting method was used to control the soil water content to produce a soil
water stress gradient. e effects of drought and rewatering on the changes in
osmotic adjustment substance content, antioxidant enzyme activity, and
photosynthetic characteristics of potted Dicranostigma henanensis seedlings were
measured on Day 28 aer the imposition of watering treatments and Day 7 aer
rewatering. During the drought stress process, the relative electrical conductivity,
thiobarbituric acid, water use efficiency, and proline content displayed a
continuously increasing trend. Further, the net photosynthetic rate, stomatal
conductance, and transpiration rate constantly decreased, while the chlorophyll
content first increased and then decreased. Aer rehydration, superoxide
dismutase (EC 1.15.1.1) activity and photosynthetic parameters quickly recovered
to the CK level (soil moisture is 75%–80% of the maximum water holding capacity
in the field), indicating that D. henanensis plants have a strong ability to repair the
damage caused by drought stress. In particular, the photosynthetic machinery
may have sophisticated regulation and repair mechanisms, which may be
associated with its stable photosystem. Collectively, our findings demonstrate that
the D. henanensis plant has a strong ability to adapt to arid environments, and
therefore could be an excellent ornamental flower for landscaping in arid and
semiarid areas.
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