Spatial and temporal distribution of mineral nutrients and sugars throughout the lifespan of <Emphasis Type="Italic">Hibiscus rosa-sinensis</Emphasis> L. flower |
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Authors: | Alice Trivellini Antonio Ferrante Paolo Vernieri Giulia Carmassi Giovanni Serra |
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Institution: | 1.Department of Crop Biology,Università degli Studi di Pisa,Pisa,Italy;2.Department of Plant Production,Università degli Studi di Milano,Milano,Italy;3.Sant’Anna School of Advanced Studies,Pisa,Italy |
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Abstract: | Although the physiological and molecular mechanisms of flower development and senescence have been extensively investigated,
a whole-flower partitioning study of mineral concentrations has not been carried out. In this work, the distribution of sucrose,
total reducing sugars, dry and fresh weight and macro and micronutrients were analysed in Hibiscus rosa-sinensis L. petals, stylestigma including stamens and ovary at different developmental stages (bud, open and senescent flowers). Total
reducing sugars showed the highest value in petals of bud flowers, then fell during the later stages of flower development
whereas sucrose showed the highest value in petals of senescent flowers. In petals, nitrogen and phosphorus content increased
during flower opening, then nitrogen level decreased in senescent flowers. The calcium, phosphorus and boron concentrations
were highest in ovary tissues whatever the developmental stage. Overall, the data presented suggests that the high level of
total reducing sugars prior the onset of flower opening contributes to support petal cells expansion, while the high amount
of sucrose at the time of petal wilting may be viewed as a result of senescence. Furthermore, this study discusses how the
accumulation of particular mineral nutrients can be considered in a tissue specific manner for the activation of processes
directly connected with reproduction. |
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