TITLE:
Effects of Exogenous Nitric Oxide on Wheat Exposed to Enhanced Ultraviolet-B Radiation
AUTHORS:
Liyan Yang, Rong Han, Yi Sun
KEYWORDS:
Nitric Oxide; Seedling Development; UV-B Radiation; Wheat
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.6,
June
25,
2013
ABSTRACT: We explored
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.