Growth and Flowering of Endemic Wild Libyan Geophyte, Cyclamen Rohlfsianum Ascher, With a High Ornamental Value

Khalafalla, Mutasim M.; Menesy, Fardous; Magouz, M. R.; Hamed, Elfaki Bashir Elfaki

doi:10.15666/aeer/1803_45834594

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“…The study was conducted in naturally occurring patches of Cyclamen graecum Link distributed in the campus of the National and Kapodistrian University of Athens in Greece (latitude: 37.9664, longitude: 23.756971, altitude 260 m), at the foothills of Hymettus Mountain, where travertine limestone appears along discontinuities of strongly fractured gray dolomite limestone; also, father soil characteristics, texture, and composition have been previously published [54,55]. Concerning perennial geophytes, most bulbs and tubers must reach a critical size before floral induction can occur [56]. In addition, large bulbs and tubers generally produce vigorous above-ground organs and/or many flowers.…”

Section: Research Site and Plant Phenologymentioning

confidence: 99%

The Influence of the Partitioning of Sugars, Starch, and Free Proline in Various Organs of Cyclamen graecum on the Biology of the Species and Its Resistance to Abiotic Stressors

Pouris

Levizou

Karatassiou

et al. 2022

Plants

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The geophyte Cyclamen graecum is native to the eastern Mediterranean. Its beautiful flowers with upswept pink petals appear during early autumn, after the summer drought period and before leaf expansion in late autumn. The floral and leaf development alternates with their cessation in early winter and late spring, respectively. Ecophysiological parameters and processes underlining the life-cycle of C. graecum have not previously been published. Seasonal fluctuations of sugars, starch, and free proline have been investigated in tubers, leaves, pedicels, and petals, as well as petal and leaf water status. At the whole plant level, the seasonal co-existence of leaves and flowers is marked by an elevated soluble sugar content, which was gradually reduced as the above-ground plant parts shed. The sugar content of petals and pedicels was lower than that of leaves and tubers. Leaf starch content increased from late autumn to spring and was comparable to that of tubers. The starch content in petals and pedicels was substantially lower than that of tubers and leaves. In tubers, monthly proline accumulation was sustained at relatively constant values. Although the partitioning of proline in various organs did not show a considerable seasonal variation, resulting in an unchanged profile of the trends between tubers, leaves, and flowers, the seasonal differences in proline accumulation were remarkable at the whole plant level. The pronounced petal proline content during the flowering period seems to be associated with the maintenance of floral turgor. Leaf proline content increased with the advance of the growth season. The values of leaf relative water content were sustained fairly constant before the senescence stage, but lower than the typical values of turgid and transpiring leaves. Relationships of the studied parameters with rainfall indicate the responsiveness of C. graecum to water availability in its habitat in the Mediterranean ecosystem.

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Section: Research Site and Plant Phenologymentioning

confidence: 99%