title: 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.
abstract: In order to investigate the function of the peptidyl plant growth factor, phytosulfokine-alpha (PSK-alpha), in plants, we examined the effect of PSK-alpha 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-alpha 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-alpha not only promotes cell proliferation, but may aid plants in their tolerance of heat stress.
authors.affiliation: Institute of Biological Sciences, University of Tsukuba, Ibaraki, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yamakawa
authors.forename: Y
authors.initials: Y
authors.lastname: Matsubayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Sakagami
authors.forename: H
authors.initials: H
authors.lastname: Kamada
authors.forename: S
authors.initials: S
authors.lastname: Satoh
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives / Q000378:metabolism; D017360:Arabidopsis / Q000187:drug effects / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism*; D002940:Circadian Rhythm; D007701:Kinetin; D036361:Peptide Hormones; D010937:Plant Growth Regulators / Q000494:pharmacology*; D010940:Plant Proteins / Q000494:pharmacology*; D012639:Seeds / Q000187:drug effects / Q000378:metabolism; D013696:Temperature
chemical_list: C100975:PSK-alpha protein, plant; D036361:Peptide Hormones; D010937:Plant Growth Regulators; D010940:Plant Proteins; D002734:Chlorophyll; D000225:Adenine; D007701:Kinetin