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- W2051267916 abstract "Numerous physiological studies of so-called regeneration in the Bryophyllum leaf have been undertaken in the past, particularly within the last fifteen years, but the results are difficult of correlation. Recently this leaf has been the subject of several morphological studies. Interest in these papers has centered upon the latent meristem of the leaf notches and its relation to the vegetative propagation of the plant. Howe (I93I) emphasized the normal occurrenlce of meristein in the leaf notches and its definite organization into buds upon adult leaves. She stated that the roots of the young plantlets take their origin somewhere near the vein, and are formed some time after the stem primordium. Mehrlich (I93I) in a recent paper included some observations on the morphology and general structure of the leaf. He found that marginal, sub-epidermal meristems existed in young leaves olleeighth of an inch long and concluded that proliferation of the leaf does not involve the changing of differentiated cells into the embryonic condition. The writer (1932a) in a preliminary report on the Bryophyllumi leaf pointed out that latent meristems are present in leaves but 2 mm. in length and give rise in adult leaves to foliar embryos comprising primordia of both root and shoot. Since residual, localizedc meristem thus occurs normally in the notches of the leaves, it was argued that the term regeneration should not be applied to the development of such embryos. Naylor (I932) reported the normal occurrence of definitely organized primordia in the Bryophyllum leaf and applied the term embryo to such units. His conlclusions agree with those of Howe as to the origin of this foliar meristem; but Naylor also described root primordia and a foot region for embryos on attached, normal leaves. Notches were reported by Naylor as first appearing when leaves were 5-6 mm. long. The formation of such notches was correlated with the establishment of the meristem in the leaf. More recently the writer (1932b) published a developmental and anatomical study of the foliar embryos in Bryophyllum which included, however, only a general survey of leaf development. It was pointed out that foliar embryos are laid down very early in ontogeny and are to be correlated in time with the basipetal notch development. The appearance of these five articles within the past two years indicates a considerable interest in the morphology of the Bryophyllum leaf. It is" @default.
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- W2051267916 date "1934-10-01" @default.
- W2051267916 modified "2023-09-27" @default.
- W2051267916 title "HISTORY OF LEAF DEVELOPMENT INBRYOPHYLLUM CALYCINUM" @default.
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- W2051267916 doi "https://doi.org/10.1002/j.1537-2197.1934.tb04974.x" @default.
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