Abstract
Withholding nitrogen decreased the percentages of nitrogen and chlorophyll in the blades; reduced the total fixation of radioactive carbon dioxide at 15, 37, and 178 seconds; and changed the relative composition of fixation products. Translocation of radioactive photosynthate from the fed part down the attached blade and into the stalk was less in the plants deprived of nitrogen than in the control plants supplied with nitrogen. Both the percentage of total activity translocated and the velocity of transport were decreased by nitrogen deficiency. During a translocation period of 90 minutes the minus nitrogen blade retained more 14C-sucrose than the control in the fed part and the blade below the fed part, but it sent less 14C-sucrose to the sheath of the fed leaf. Thus translocation decreased with nitrogen deficiency not for lack of sucrose but for some other reason. Although withholding nitrogen decreased translocation of labeled carbon in and from attached blades, there was no effect upon transport in detached blades. The effect of nitrogen deficiency upon translocation may be indirect and secondary to the effect upon growth of the plant as a whole.
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Selected References
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- Hartt C. E. Effect of Moisture Supply upon Translocation and Storage of C in Sugarcane. Plant Physiol. 1967 Mar;42(3):338–346. doi: 10.1104/pp.42.3.338. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hartt C. E. Effect of Potassium Deficiency upon Translocation of C in Detached Blades of Sugarcane. Plant Physiol. 1970 Feb;45(2):183–187. doi: 10.1104/pp.45.2.183. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hartt C. E. Effect of potassium deficiency upon translocation of C in attached blades and entire plants of sugarcane. Plant Physiol. 1969 Oct;44(10):1461–1469. doi: 10.1104/pp.44.10.1461. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hartt C. E., Kortschak H. P., Forbes A. J., Burr G. O. Translocation of C in Sugarcane. Plant Physiol. 1963 May;38(3):305–318. doi: 10.1104/pp.38.3.305. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kortschak H. P., Hartt C. E., Burr G. O. Carbon Dioxide Fixation in Sugarcane Leaves. Plant Physiol. 1965 Mar;40(2):209–213. doi: 10.1104/pp.40.2.209. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nelson C. D., Clauss H., Mortimer D. C., Gorham P. R. Selective translocation of products of photosynthesis in soybean. Plant Physiol. 1961 Sep;36(5):581–588. doi: 10.1104/pp.36.5.581. [DOI] [PMC free article] [PubMed] [Google Scholar]