Net photosynthetic rate in peanut (Arachis hypogaea L.): Influence of leaf position,time of day,and reproductive-sink |
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Authors: | Nautiyal PC Ravindra V Joshi YC |
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Institution: | (1) National Research Centre for Groundnut, Post Bag No. 5, Junagadh, 362 001 Gujarat, India |
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Abstract: | 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.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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Keywords: | chlorophyll dry mass leaf number and area peg pod saccharides stomatal conductance temperature transpiration |
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