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The expression levels of senescence-associated genes in the 8th leaves from 38-day-old vector control plants, PbELF4a-OE, and PbELF4b-OE transgenic lines are depicted. The expression of each gene in control plants was normalized to “1,” with AtACT serving as the internal control. Data are presented as means ± SD (n = 3). Statistical significance was determined using Student’s t-tests compared to the vector control plants, ** indicates P < 0.01, *** indicates P < 0.001
