Stress-induced factors involved in flower formation in Lemna.

Atsushi Takimoto; Sumiko Kaihara; Mineyuki Yokoyama

At a concentration equivalent to 0.3-1 μM, the norepinephrine solution in which the drought-stressed plants of Lemna paucicostata 441 were immersed for 2 h, induced flowering in L. paucicostata 151. Not only drought stress but also osmotic stress, 5 min on 0.5 M mannitol solution, and heat stress, 5 min on 45-55°C hot water, were effective in producing or releasing a factor capable of activating norepinephrine. Such a putative factor has been designated as 'factor C'. The first supernatant obtained after immediate centrifugation of the homogenate of the plants had only weak factor C activity, but the second supernatant, obtained after a 30-min incubation of the suspension of the first pellet, showed high factor C activity. The water in which Lemna plants subjected to both drought and heat stresses had been immersed for 2 h, showed flower-inducing activity even in the absence of added norepinephrine.

LEMNA paucicostata; FLOWERS; EFFECT of drought on plants; EFFECT of heat on plants; EFFECT of stress on plants; NORADRENALINE

Physiologia Plantarum, 1994, Vol 92, Issue 4, p624

0031-9317

Academic Journal

10.1111/j.1399-3054.1994.tb03032.x