The promotive effects of a peptidyl plant growth factor, phytosulfokine-alpha, on the formation of adventitious roots and expression of a gene for a root-specific cystatin in cucumber [Cucumis sativus] hypocotyls
1998
Yamakawa, S. (Tsukuba Univ., Ibaraki (Japan)) | Sakuta, C. | Matsubayashi, Y. | Sakagami, Y. | Kamada, H. | Satoh, S.
Phytosulfokines (PSKs) were the first peptidyl growth factors from a higher plant to be characterized. They induce the proliferation in suspension culture of mesophyll cells of asparagus (Asparagus officinalis L; Matsubayashi and Sakagami 1996b). We examined the effects of PSK-alpha on the formation of adventitious roots on cucumber hypocotyls. The number of roots increased 2- to 2.5-fold after treatment with PSK-alpha but derivatives of PSK-alpha were inactive in our assay system. The effect of PSK-alpha on the formation of adventitious roots was also examined in terms of the expression of a newly isolated gene for a root-specific cystatin of cucumber (RCC). The results indicate that PSK-alpha can promote organogenesis in plant, acting possibly via enhancement of the proliferation of plant cells
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