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Delayed leaf senescence in T181A and T181S tobacco as compared with wt (Petit Havana), showing basal leaf senescence even before blooming. Tobacco T181A and T181S are point mutants obtained from wt tobacco in which the phosphorylable threonine at position 181 of the NDH-F subunit of the Ndh complex is changed to non-phosphorylable alanine and serine, respectively [17].
