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Effect of Time and Plant K Status on ¹⁴C-labeled Photosynthate Movement in Cotton¹

The effect of time and plant K status on the rate and pattern of photosynthate translocation in 5-week-old cotton (Gossypium hirsutum L.) plants was investigated using ¹⁴CO₂ labeling techniques. The cumulative total of ¹⁴C-photosynthate translocated from the source leaf increased in a hyperbolic manner with distance during a 2-hour translocation time. The maximum velocity of photosynthate translocation was approximately 50 cm per hour. Decreasing the K content of plants markedly reduced both the quantity and the distance that photosynthate moved from the source leaves. The reduction in photosynthate translocation resulting from reduced K content was obtained before visible K deficiency symptoms appeared on the plant.

Key Words: Photosynthate translocation • Gossypium hirsutum L. • Mineral nutrient deficiency

² Assistant Professor and Former Graduate Research Assistant of Agronomy, respectively.

Received for publication March 24, 1972.

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