Some physiological studies on rice grown on manganese-deficient soil [India]
1986
Kaur, N.P. | Nayyar, V.K. (Punjab Agricultural Univ., Ludhiana 141004 (India). Soils Dept.)
Photosynthetic oxygen evolution (POE) was very low in Mn-deficient plant but increased with application of 2.5 mg Mn/kg. Applying more Mn did not proportionately increase POE. Chloroplast peroxidase was highest in plants that received no Mn. Cytoplasmic peroxidase increased up to 10 mg Mn/kg and decreased slightly at higher rates. Elemental analysis of leaves showed Mn concentration increased with Mn supply. Fe 2+ and total Fe content in leaves was highest in 0 Mn plants, indicating an inverse relationship with Mn concentration. Zn concentration did not change with Mn application. Grain yield was significantly higher (about 4 times more with 20 mg Mn/kg than with 0 Mn) with Mn applications, but straw yield was about the same. Grain filling was incomplete in Mn-deficient plants. DTPA Mn content 42 d after transplanting had increased many fold in all pots due to reduction under submerged conditions. Results indicate that although rice plants did not show symptoms of Mn deficiency, low Mn decreased photosynthetic activity and impaired translocation of photosynthates
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