Photosynthetica 1999, 36(1):129 | DOI: 10.1023/A:1007079022742

Net photosynthetic rate in peanut (Arachis hypogaea L.): Influence of leaf position, time of day, and reproductive-sink

P.C. Nautiyal1, V. Ravindra1, Y.C. Joshi1
1 National Research Centre for Groundnut, Gujarat, India

Net photosynthetic rate (PN) was studied in field-grown peanut cv. GG 2 in relation to leaf position, time of day, reproductive-sink, and phenophase. In general, PN remained higher in the upper leaves (first from top to the fourth) than in the lower leaves (fifth to eighth). The mean PN of the leaves situated upper and the leaves lower in the canopy increased from the morning, reached a maximum during noon hours, and decreased thereafter. Between 09:00 to 10:00 h, PN, stomatal conductance (gs), and transpiration rate (E) in the upper leaves were higher than in the lower leaves, but between 12:00 and 13:00 h, these activities increased significantly in the lower leaves. Highest PN was found during pod-development phase. Removal of flowers, and hence of active reproductive-sink, decreased plant height and number of leaves, and initiated accumulation of photosynthates in the leaves. The PN per unit leaf area in plants with reproductive-sink (WRS) was similar to those without reproductive-sink (WORS). However, leaf area of WORS plants decreased significantly, mainly due to the reduction in number of leaves. No feed-back inhibition of PN (per unit leaf area) was found despite accumulation of photosynthates in the leaves as a result of removal of the active reproductive-sink.

Additional key words: chlorophyll; dry mass; leaf number and area; peg; pod; saccharides; stomatal conductance; temperature; transpiration

Published: June 1, 1999  Show citation

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Nautiyal, P.C., Ravindra, V., & Joshi, Y.C. (1999). Net photosynthetic rate in peanut (Arachis hypogaea L.): Influence of leaf position, time of day, and reproductive-sink. Photosynthetica, 36(1-2), 129. doi: 10.1023/A:1007079022742
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