Photosynthetica 2004, 42(2):313-316 | DOI: 10.1023/B:PHOT.0000040607.67963.38

14CO2 Assimilation and 14C-photosynthate Translocation in Different Leaves of Sunflower

Desiraju Subrahmanyam1, V.S. Rathore2
1 ICAR Research Complex for Eastern Region, WALMI Complex, Bihar, India, e-mail
2 Department of Environmental Sciences, College of Basic Sciences Humanities, G.B. Pant University of Agriculture and Technology, Uttaranchal, India

Chlorophyll and nitrogen contents were highest in leaves of middle position, similarly as photosynthetic efficiency represented by 14C fixation (maxima in leaf 5 from the top). All the leaves lost 14C after 2 weeks of 14CO2 exposure. However, the reduction in radioactivity was less in young upper leaves than in the mature lower leaves. Leaves exported 14C-photosynthates to stem both above and below the exposed leaf. Very little radioactivity was recovered from the seeds of plants in which only first or second leaves were exposed to 14CO2 implying thereby that the carbon contribution of first two leaves to seed filling was negligible. The contribution of leaves to seed filling increased with the leaf position up to the sixth leaf from the top and after the seventh leaf their contribution to seed filling declined gradually.

Additional key words: 14C-partitioning; Helianthus; seed filling

Published: June 1, 2004  Show citation

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Subrahmanyam, D., & Rathore, V.S. (2004). 14CO2 Assimilation and 14C-photosynthate Translocation in Different Leaves of Sunflower. Photosynthetica, 42(2), 313-316. doi: 10.1023/B:PHOT.0000040607.67963.38
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