• C P Sharma

      Articles written in Proceedings – Plant Sciences

    • Response of pigeon pea to variable levels of manganese

      C P Sharma Neena Khurana C Chatterjee S C Agarwala

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      Pigeon pea (Cajanus cajan (L.) Millsp.) cv. T21 was grown in refined sand at manganese levels ranging from 0-0011 to 5·5 mg 1−1. At less than 0·055 mg Mn 1−1, growth was depressed. In manganese deficient plants, there was reduction in the area and number of leaves. A reduction in seed yield was observed at low and excess manganese and was optimum at 0·55 mg Mn1−1. Manganese deficient plants showed enhanced levels of peroxidase and ribonuclease activity and caused reduction in chlorophyll content, sugars, Hill activity and activities of catalase, acid phosphatase and aldolase. When manganese supply was low, manganese concentration in leaves decreased and iron, zinc, copper and phosphorus concentrations increased. Values for deficiency, threshold of deficiency and toxicity of manganese in leaves were respectively 25, 39 and 190·5 μg g−1 and in seeds they were 10·6, 12·8 and 18·2 μg g−1 dry matter.

    • Potassium effect on tissue hydration and transpiration in cauliflower

      Sandhya Singh C P Sharma

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      Cauliflower (Brassica oleracea L. var. Botrytis L. cv. Pusi) grown with 0·2, 0·4, 0·8, 2·0 and 4·0 mM K produced best growth and optimum dry matter at 4 mM K. Suboptimal K supply caused decrease in tissue concentration of K and produced visible symptoms of K-deficiency. Leaves of low K plants showed decrease in stomatal aperture associated with increase in stomatal resistance and decrease in transpiration. At the same time, their specific leaf weight was high and relative water content was low, indicating poor tissue hydration. Low K leaves also showed increased accumulation of proline. The magnitude of the K-deficiency effects was related to the severity of K-deficiency. Observations suggest poor absorption-transport of water under K-deficiency.

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