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Der Einfluß isoosmotischer Lutrol‐ und Salzlösungen auf die Chlorophyllkonzentration und das Chlorophyll‐a/b‐Verhältnis bei Phaseolus vulgaris
Author(s) -
Herwig K.,
Raafat A.
Publication year - 1972
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19721310214
Subject(s) - phaseolus , chlorophyll , chlorophyll a , chlorophyll b , zoology , chemistry , osmotic pressure , salt (chemistry) , horticulture , biology , biochemistry
The influence of isoosmotic Lutrol‐ and salt solutions upon the chlorophyll‐concentration and chlorophyll a/b ratio of Phaseolus vulgaris The behaviour of the chlorophyll status of Phaseolus vulgaris was studied under the influence of different isoosmotic Lutrol and salt solutions in the root medium. Phaseolus seedlings, 12 days old, were raised in a nutrient solution containing isoosmotic concentrations of 0.54 (control); 1.26; 2.82 and 4.68 atm. created by either Lutrol or salts (40% chlorine, 60% sulfate). An increase in the osmotic pressure of the primary and normal leaves generally paralleled the increase in the osmotic pressure of the media with a more pronounced effect in the case of salts than in Lutrol. Mean values of osmotic pressure of both primary and normal leaves during the sampling period were 6.19; 10.35 and 12.98 atm. for control, Lutrol III and salt III respectively. Increasing the osmotic pressure of the media due to salts resulted in a significant decrease of the chlorophyll content of primary leaves (mean value during the sampling period: Cont.: 19.8 μg/cm 2 ; salt II: 12.7 μ/cm 2 ; salt III: 6.3 μg/cm 2 ), accompanied with a decreasing tendency in the chlorophyll a/b ratio. Such effect was only detectable in the case of the highest Lutrol concentration at the end of the experiment. However, the mean values of the sampling period did not show any significant variation from those of controls (Lutrol II: 18.9 μg/cm 2 ; Lutrol III: 16.1 μg/cm 2 ). Both types of osmoticum decreased remarkably the total chlorophyll amount of normal leaves. This behaviour resulted more clearly from a reduction in the leaf area than from the decrease in the chlorophyll concentration. The mechanism of plant response to changes in the osmotic pressure of the medium seemed to depend mainly on the type of osmoticum affecting such variations. In general the changes in the osmotic pressure created by salts affected both mature and developing leaves i.e. primary and normal leaves respectively, whereas such changes in the case of Lutrol affected mainly the latter organs.