Sammendrag
Viral diseases (a biotic stress) and salinity (an
abiotic stress) have been/are the two major constraints
for sustainable development of the world’s agricultural
production including potato. Crops grown in field are
often exposed simultaneously to abiotic and biotic
stress, and responses of plants to co-stress by two or
more factors may differ from those to each of the multiple
stresses. Using in vitro cultures, we demonstrated
that virus infection (singly and in combination) or salt,
and co-stress by virus infection (singly and in combination)
and salt significantly reduced growth and
microtuber production, and caused severely oxidative
cell damage determined by levels of O2·− and methane
dicarboxylic aldehyde, and H2O2 localization in situ.
Alterations in physiological metabolism by increasing
total soluble sugar and free proline, and by decreasing
chlorophyll content are responses of potato plantlets to
virus infection (singly and in combination) or salt stress
and co-stress by virus infection (singly and in
combination) and salt. Oxidative cell damage and reduced
chlorophyll content caused by virus and/or salt
are believed to be responsible for the reduced growth,
eventually resulting in decreased tuber yield. Results
reported here would help us to better understand possible
mechanism of reduced tuber yield by virus infection
and/or salt stress.
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