AI Article Synopsis
- Floral meristems typically have a determinate growth pattern, but in some flowers of Impatiens balsamina, there are instances of indeterminate growth where new organs can develop even after ovule formation.
- This study focuses on how the gynoecium (female reproductive part) develops in this plant and examines why some floral meristems exhibit indeterminacy.
- Findings indicate that the placenta can form without full fusion of carpels, leading to new growth from remnants of the placenta and highlighting the role of specific genes in meristem development and floral structure.
Article Abstract
* Floral meristems are generally determinate. Termination of their activity varies with species, occurring after carpel or ovule development, depending on the placentation type. In terminal flowering Impatiens balsamina (cv. Dwarf Bush Flowered) some flowers exhibit meristem indeterminacy; they produce organs from the placenta after ovule development. * Here we provide a detailed description of gynoecium development in this line and explore the basis of the indeterminate nature of some of its floral meristems. * We find that the placenta is sometimes established without complete carpel fusion. Proliferative growth derives from meristematic remnants of the placenta and is more common in the terminal inflorescence. RNA in situ hybridization reveals that IbLFY (Impatiens LFY homologue) is expressed in all meristem states, even in proliferating meristems. Expression of IbAG in axillary flowers is as expected in the meristem, stamens and carpels but absent from the proliferating meristem. * We conclude that I. balsamina has cauline placentation. Incomplete suppression of inflorescence identity in flowers of the terminal inflorescence leads to floral meristem proliferation after ovule development in this species.
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| http://dx.doi.org/10.1111/j.1469-8137.2006.01899.x | DOI Listing |
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