Developmental Effects of Zeatin, Ribosyl-Zeatin, and Agrobacterium tumefaciens B6 on Certain Mosses

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Abstract
Eight species of mosses [Atrichum undulatum, Polytrichum commune, Funaria hygrometrica, Thuidium delicatum, Climacium americanum, Pylaisiella selwynii, Entodon seductrix and Heterophyllum haldaneanum] were divided into 2 groups on the basis of their developmental responses to ribosyl-trans-zeatin and A. tumefaciens B6. All 8 produced either gametophores or callus on the protonema in response to 6-(.gamma.,.gamma.-dimethylallylamino)purine and trans-zeatin. Three which produced normal gametophores with A. tumefaciens yielded callus or abnormal gametophores with ribosyl-trans-zeatin. Ribosyl-trans-zeatin and A. tumefaciens were relatively ineffective on 5 other mosses. Characteristics of protonemal growth common to each of these 2 groups are described.