The effect of nutrient deficiencies on phosynthesis and respiration in spinach |
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Authors: | D E Bottrill J V Possingham P E Kriedemann |
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Institution: | (1) C.S.I.R.O. Division of Horticultural Research, Adelaide, South Australia;(2) Merbein, Victoria |
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Abstract: | Summary Spinach plants were grown in nutrient-culture solutions containing reduced levels of all the macro- and micro-nutrient elements
except cobalt and chlorine. The rates of photosynthesis (carbon dioxide fixation in the light expressed on a per unit chlorophyll
or per unit fresh-weight basis) and respiration (carbon dioxide evolution in the dark expressed on a per unit nitrogen or
per unit fresh-weight basis) for whole plants were measured using infra-red gas analysis techniques. Measurements were made
when the plants displayed clear symptoms of deficiency relative to control plants.
All nutrient deficiencies except iron and molybdenum depressed photosynthesis when chlorophyll was the basis of calculation;
manganese-, copper-, phosphorus- and potassium-deficient plants showed the greatest depression. Alternatively when photosynthesis
was calculated on a fresh weight basis calcium was the only deficiency which had no affect. Similarly when respiration was
calculated on a nitrogen basis all deficiencies except iron, molybdenum and nitrogen result in depressed rates but when respiration
was expressed on a fresh-weight basis potassium deficiency resulted in enhanced respiration rates and nitrogen, phosphorus,
sulphur, manganese, zinc and molybdenum deficiencies resulted in reduced respiration rates. |
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