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the use of exogenous nitric oxide (NO) on alleviating effects of UV-B light on
winter wheat development. Triticum
aestivum L. cv. Linyou 7287 seeds were irradiated with UV-B (10.08 kJ·m–2·d–1)
(enhanced UV-B) and watered with either water or 100 μmol·L–1 SNP
solution. Plants were also watered with the SNP alone. The results showed that
enhanced UV-B produced negative effects on seedling development. Leaf length
decreased and seedling biomass dropped significantly compared with the control.
Photochemical efficiency (Fv/Fm) dropped, and chlorophyll and carotenoid
content as well as the ATPase activity declined. Content of UV-absorbing compounds
and activity of the POD increased compared to the control. Application of the
SNP, a NO donor partially protected wheat seedlings exposed to elevated UV-B
radiation in that their leaf lengths and biomass accumulation were enhanced
compared to the UV-B treatment alone. SNP also improved the contents of chlorophyll,
carotenoid and UV-absorbing compounds in leaves. ATPase activity was enhanced
but no influence on POD activity. Furthermore, the application of SNP alone
showed a favorable effect on seedling growth compared with the control.
To explore the wheat seedling development and physiological responses
under copper contamination and enhanced
ultraviolet-B (UV-B) irradiation, 10 mg·L-1 CuCl2 solution was
irrigated to Triticum aestivum L. cv.
Linyuan 2069 one day after germination with or without ultraviolet-B (10.08 kJ m-2·d-1)
light exposure, respectively. The results showed that Cu2+ and UV-B
caused various adverse effects on wheat seedling development. Cu2+ hindered root development by significantly reducing root number, while UV-B
dwarfed seedling height and decreased the leaf length. Chlorophyll content and
activity of ATPase in thylakoid membrane of wheat leaves dropped significantly
under enhanced UV-B while the activity of ATPase in plasma membrane of seedling
root was significantly decreased in Cu2+ group. Relative electric
conductivity of leaves significantly increased in both Cu2+ and UV-B
groups, so did the biomass. We also observed that combined Cu2+ and
UV-B showed more adverse effects on wheat seedlings than either of them alone
except for root growth.