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Half-fronds of Spirodela polyrrhiza accumulated high level of endogenous serine when they had been cultivated under long-day conditions and on a cytokinin-free medium for 4 days, after which the irreversible senescence process was triggered. When 1μM 6-benzyl adenine (6-BA) was included in the medium, the accumulation of endogenous serine was significantly inhibited, and at the same time the biological...