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Atnoa1 mutant Arabidopsis plants induce compensation mechanisms to reduce the negative effects of the mutation.

Abstract：

:Alterations in temperature adaptation processes and changes in the content of stress-related compounds, polyamines and salicylic acid were evaluated in Atnoa1 (NO-associated 1) Arabidopsis mutant. The F(v)/F(m) chlorophyll-a fluorescence induction parameter and the actual quantum yield were significantly lower in the Atnoa1 mutant than in the wild-type. In the wild-type Col-0, the fastest increase in the non-photochemical quenching (NPQ) occurred in plants pre-treated at low temperature (4 °C), while the slowest was in those adapted to 30 °C. The NPQ showed not only a substantially increased level in the light-adapted state, but also more rapid light induction after the dark-adapted state in the Atnoa1 mutant than in the wild-type. The results of freezing tests indicated that both the wild-type and the mutant had better freezing tolerance after cold hardening, since no significant differences were found between the genotypes. The level of putrescine increased substantially, while that of spermine decreased by the end of the cold-hardening (4°C, 4d) period. The quantity of spermidine in Atnoa1 was significantly higher than in Col-0, at both control and cold-hardening temperatures. A similar trend was observed for spermine, but only under control conditions. The mutant plants showed substantially higher salicylic acid (SA) contents for both the free and bound forms. This difference was significant not only in the control, but also in the cold-hardened plants. These results suggest that there is a compensation mechanism in Atnoa1 mutant Arabidopsis plants to reduce the negative effects of the mutation. These adaptation processes include the stimulation of photoprotection and alterations in the SA and polyamine compositions.

journal_name

J Plant Physiol

journal_title

Journal of plant physiology

authors

Majláth I,Szalai G,Papp I,Vanková R,Janda T

doi

10.1016/j.jplph.2011.01.021

subject

Has Abstract

pub_date

2011-07-15 00:00:00

pages

1184-90

issue

11

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(11)00090-3

journal_volume

168

pub_type

杂志文章

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