Promotive effects of the peptidyl plant growth factor, phytosulfokine-alpha, on the growth and chlorophyll content of Arabidopsis seedlings under high night-time temperature conditions
1999
Yamakawa, S. (Tsukuba Univ., Ibaraki (Japan). Inst. of Applied Biochemistry) | Matsubayashi, Y. | Sakagami, Y. | Kamada, H. | Satoh, S.
In order to investigate the function of the peptidyl plant growth factor, phytosulfokine-alpha (PSK-a), in plants, we examined the effect of PSK-a on the growth and chlorophyll content of Arabidopsis seedlings under high night-time temperature conditions. Although exposure to high night-time temperatures markedly reduced the fresh weight and chlorophyll content of the seedlings, these parameters in the plants supplied with PSK-a remained at the same levels as those of non-treated controls. These effects were not apparent when [2-5]PSK, Tyr-SO3H and kinetin were similarly supplied. The results suggest that PSK-a not only promotes cell proliferation, but may aid plants in their tolerance of heat stress
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