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- W2057702545 abstract "Species used in this investigation were Atriplex spongiosa and Mesembryanthemum crystallinum. Mesembryanthemum-plants having 3 successive leaf pairs (numbered with ascending insertion) were treated with 150 and 300 mM NaCl-solutions, respectively, while Atriplex-plants having 7 successive leaves and branches originated in the axils of the leaves were only treated with 300 mM NaCl. During the following 20–30 days the increase of NaCl in the leaves and the incorporation of 14CO2 in the dark was determined. The experiment showed that the middle leaves, before they had reached their approximate final size, had the highest rates of 14CO2-incorporation in the dark. In the course of the experiment the, optimal CO2 dark fixation rate shifted towards the tip of the plants. This was the case in treated and untreated Mesembryanthemum-plants and in untreated Atriplex plants. Leaves of treated Atriplex plants wilted and were killed within 20 days of NaCl-treatment. In contrast, leaves of the branches were not affected by NaCl. During the first days of NaCl-treatment 14CO2 fixation declined. The lower CO2 incorporation of the branches of Atriplex was not restored as was the case in Mesembryanthemum-leaves. Here the fixation rate of the treated plants reached the level of the untreated ones within 13 days. Thereafter a drastic increase in 14CO2 dark fixation occurred. At that time plants exhibit a Crassulacean acid metabolism, as was reported earlier. The lag phase between the beginning of the NaCl treatment and the first appearence of increased dark fixation is not affected by the concentration of NaCl in the growing solution. But leaf age and NaCl-concentration influence the magnitude of dark fixation. The flexibility and possibility of adaptation to changed environment conditions decreases with increasing leaf age. The first leaf pair of Mesembryanthemum was killed by NaCl, the increase in dark fixation of the second leaf pair was half of that exhibited by the third leaf pair. The results are discussed on a morphogenetic and oecophysiological basis." @default.
- W2057702545 created "2016-06-24" @default.
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- W2057702545 date "1974-04-01" @default.
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- W2057702545 title "Einfluß von NaCl und blattalter auf die CO2-dunkelfixierung bei halophyten — Vergleichende untersuchung bei Mesembryanthemum crystallinum und Atriplex spongiosa" @default.
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- W2057702545 doi "https://doi.org/10.1016/s0044-328x(74)80009-7" @default.
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