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2 Acta Physiologiae Plantarum

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Response of CO2 uptake, chlorophyll content, and some productional features of forest herb Smyrnium perfoliatum L.[Apiaceae] to different light conditions

100%

Olah R. , Masarovicova E.

Acta Physiologiae Plantarum

1997

tom 19

nr 3

Smyrnium perfoliatum L. (Apiaceae), an endangered summer forest herb grown in the understory of dominant oak-hornbeam stands in Devinska Kobyla, Little Carpathians region in SW Slovakia, is considered to form at least five leaf types of different physiological and anatomical quality. These observation are based upon the estimated differences of photosynthetic carbon dioxide uptake, chlorophyll content, leaf anatomy, and several quantitative parameters of growth analysis. There is a further attempt to establish, to what extent the daily changing environment, especially the excess of light of fast-moving sun-flecks by the photosynthetic apparatus within any leaf type, according to its dominant shade adaptation could be effectively used.

Photosynthesis, respiration, and chlorophylls in presenescent, regreened, and senescent leaves of forest herb Smyrnium perfoliatum L. [Apiaceae]

100%

Olah R. , Masarovicova E.

tom 20

nr 2

Smyrnium perfoliatum L. (Apiaceae), an endangered forest herb with only one main locality in South-West Slovakia (Devínska Kobyla in the Little Carpathian Mountains), is capable to recover chlorophylls at the end of the growing season. This regreening only within bracts was observed during two weeks before achieving the so-called “point of no return” that leads to the last stage of ontogenesis — leaf senescence. The effect not only of endogenous cytokinins on chlorophyll content and carbon dioxide exchange (photosynthesis, mitochondrial respiration, and photorespiration) is discussed but also of other factors such as strong irradiance, high temperature or drought stress on studied parameters was considered.