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Floral organogenesis in nicotiana tabacum a comparison of 2 cytoplasmic male sterile cultivars with a male fertile cultivar



Floral organogenesis in nicotiana tabacum a comparison of 2 cytoplasmic male sterile cultivars with a male fertile cultivar



American Journal of Botany 70(2): 266-275



Flower buds of 2 cytoplasmically male-sterile cultivars and one male-fertile cultivar of N. tabacum (L.) were studied by light and scanning electron microscopy to compare their floral ontogenies. In [gla]tbc, a cultivar with N. tabacum nuclear genes and N. glauca cytoplasm, the 5 small stamen primordia cease growth soon after they are initiated. They remain unchanged at the flanks of the ovary throughout flower maturation, so the mature flower appears stamenless. In [pbg]tbs, a N. tabacum cultivar with cytoplasm that was thought to have been derived from N. plumbaginifolia, the divergence from normal stamen development occurs before carpel emergence at which point the primordia are already notably smaller and less cylindrical than primordia of the male-fertile cultivar. After carpel emergence the primordia continue to develop, forming pink structures called petalodes, which are more similar to petals than staments. Histological sections show that formation of procambial vascular traces is similar in the abortive stamen primordia of [gla]tbc, the petalode primordia of [pbg]tbc and stamen primordia of male-fertile N. tabacum. The 2 cytoplasmic male-sterile cultivars studied here and 1 reported elsewhere show a common development stage at which the normal ontogenic pattern is altered. This stage, may be the 1st visible point in N. tabacum androgenesis which requires genetic input from the mitochondrial genome.

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Accession: 005468584

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