Effects of Potassium Deficiency on the Formation of Starch in Pisum Sativum

Day, Dorothy; Comboni, Silvia

doi:10.2307/2436638

Cited by 5 publications

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“…This result agrees with the writer's previous work on peas and with most of the earlier reports (2). WARNE (22) also found that addition of potassium was associated with greater number and size of leaves in the beet.…”

Section: Discussionsupporting

confidence: 92%

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Starch Formation in Tobacco Plants Deficient in Potassium1

Day

1940

Plant Physiology

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Potassium is important in the growing of fine tobacco. Not only is it the nutrient removed from the soil in the greatest quantity, but it is essential for the vigorous growth of the plant (3). Potassium is also more important than any other element in producing good combustion of the dried leaf (1) and is necessary for choice aroma (5).This value of potassium to the finished tobacco product has a curiously paradoxical aspect, for it has long beeln assumed that much of the importance of this element to any plant lay in its relation to carbohydrate synthesis or translocation. But the type of tobacco grown in the Connecticut Valley is low in carbohydrates, especially starch. Consequently, there is a special interest in the problem of the relationship of potassium to the formation of starch in tobacco plants.It was the aim in this study, as in much recent work, to test the leaves soon after the effects of potassium deficiency had been definitely established but well before the plant had died from lack of this element. From preliminary trials with tobacco, it appeared that seedlings started in soil, transplanted to sand, and treated with a nutrient solution, could be grown normally with the usual elongation of the internodes; or that similar plants, treated in a like manner except for the absence of potassium, would show evidence of a lack of this element during the latter part of the vegetative period. Methods Tobacco (Nicotiana tabacurm, var. Rosenberg) 2 was germiniated and grown in quantity in sandy soil until the seedlings were about two inches tall with four small leaves, from 9 to 15 weeks depending upon the season.

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Section: Discussionsupporting

confidence: 92%

“…In the solution lacking potassium, the potassiumii phosphate was (15) as slightly miiodified in previous similar work on peas. (2).…”

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confidence: 99%

Starch Formation in Tobacco Plants Deficient in Potassium1

Day

1940

Plant Physiology

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“…Sucrose as percentage of total sugars was greater in the high-than low-potassium cultures and was more abundant in the chlorophyllose than non-chlorophyllose tissues of the leaves. 4. Starch values were greater in the high-than in the low-potassium cultures, indicating a higher rate of synthesis in the former cultures, pre-sumably from sugars.…”

Section: Discussionmentioning

confidence: 88%

“…Considering the chlorophyllose sections (nos. [3][4][5] alone in the N-n series, sucrose values were from 2.0 to 3.2 times greater in the High-K than in the Low-K cultures. These Starch deposition differences in the Low-K cultures between apical and medial stem sections, in favor of the former sections, were 49 and 72 per cent., respectively, for the N-n and A-n series; those between apical and basal sections, not shown in table VI, also in favor of the former, were 552 and 773 per cent., respectively; those between medial and basal sections, in favor of the former, were 340 and 385 per cent., respectively.…”

Section: Sugarsmentioning

confidence: 99%

“…Ascorbic acid, according to GUHA and GHOSH (11), is synthesized in Phaseolus mungo from mannose by an enzyme at pH 5.8 but not at 7. 4. Ascorbic acid in the fruit of A. sativus, a synonym of A. comosus (L.) Merr., described as a reducing factor first by SZENT-GYtRGYI (42), was reported to occur in fair concentrations 1 Published with the approval of the Acting Director as Technical Paper no.…”

Section: Introductionmentioning

confidence: 99%

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