Effects of water deficit and salt stress on some photosynthesis parameters in wheat and Aegilops comosa lines
2019
Abstract: Photosynthetic responses of Aegilops comosa genotypes were compared
to those of wheat Mv9kr1 and Chinese spring in order to verify whether Ae.
comosa TA2760 and MvGB1039 genotypes are potentially suitable gene sources
for improving the drought and salt tolerance of bread wheat. Although there are
some differences between the non-stressed plants and the measure of the
decrease of the net-photosynthesis (PN), it was strongly inhibited by water deficit.
Salt stress had similar effect on PN but at the highest (300 mM) NaCl concentration
PN of the genotypes showed some activity. Severe drought induced a strong
decrease in the effective quantum yield of PS II (ɸPSII) in the genotypes, while it
was moderate in the case of salt treatment. Moreover, ɸPSII was unaffected by the
increase of NaCl concentration in wheat lines. Parallel with the decrease in ɸPSII,
the photoprotective mechanisms were enhanced in the wheat and wild wheat
genotypes during water deficit. These results suggest that the Ae. comosa
genotypes seem to respond to these stress factors with similar photosynthetic
activity to the wheat lines. Thus, based on the above-mentioned facts, the
examined Ae. comosa lines are not particularly good candidates for improving
drought tolerance of wheat.
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