<p>(A) Phenotypes of 28-day-old and 55-day-old wild-type (WT) and <i>drd1-6</i> mutant whole plants. (B) Individually darkened leaf (IDL) senescence of WT (left) and <i>drd1-6</i> (right) plants. Rosette leaves of 28-day-old WT and <i>drd1-6</i> mutant (IDL 0 d) were induced to undergo senescence for 5 d under dark conditions (IDL 5 d). The red and blue arrows indicate 5 d IDL of WT and <i>drd1-6</i> plants, respectively. (C) Phenotypes of detached WT and <i>drd1-6</i> leaves after 5-d dark incubation. (D) Photochemical efficiency of photosystem II (Fv/Fm) and (E) maximal electron transport rate (ETRmax) in WT and the <i>drd1-6</i> leaves were examined at the indicated days during dark-induced senescence (DIS). Data represent average values ± SE (n = 27) of three independent experiments. * indicates <i>P</i> < 0.01 by student’s t-test.</p

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