Effect of plant density on the uptake and distribution of 14C in the field bean, Vicia faba

Autor: Hilary J. Crompton, D. G. Hill‐Cottingham, G. A. Hudd, C. P. Lloyd‐Jones
Rok vydání: 1984
Předmět:
Zdroj: Physiologia Plantarum. 60:543-546
ISSN: 1399-3054
0031-9317
Popis: Whole bean plants, ev. Cockfield, grown in pots crowded or well-spaced (50 or 10 plants m2, respectively) were treated with 14CO2 at the pod-fill stage (25 modes) and the radioactivity in each leaf was determined after 30 min. With spaced plants the uptake was greatest in the mid-stem leaves and was proportional to leaf area. In contrast, 70% of the total assimilation took place in the upper six leaves of crowded plants and there was a steady decrease down the stem. When 14CO2 was fed to single leaves of similar crowded plants the resultant distribution of labelled assimilates varied with the position of the treated leaf. After 6 h, 67% of the 14C fixed by a mid-stem leaf (node 13) was recovered from the beans, whereas 76% of that from an upper leaf (node 23) had accumulated along the stem. Due to the shading of mid-stem leaves at the higher planting densities, seed yield becomes increasingly dependent upon re-distribution of assimilates from stem to beans.
Databáze: OpenAIRE
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