Carbohydrates Concentration in leaves of potato plants affected by nitrogen fertilization rates

Abstract

At poor conditions of nitrogen (N) in the soil, potato plants may accumulate starch in leaves and be indicative of N nutritional stress. The objective of this work was to determine the effects of N rates (0, 50, 100, 200 and 300 kg ha-1 of N) on the concentrations of carbohydrates (total soluble sugars-TSS, reducing sugars-RS, non-reducing sugars-NRS and starch) in the fourth leaf (FL) of two potato cultivars (Asterix and Atlantic) and their critical levels (CL) associated to the N fertilization rate necessary to obtain the maximum physical (MPE) and economic (MEE) efficiency of tubers. A randomized block design with four replications was used in both experiments. On day 21 after plant emergence, four FL were collected from four plants. Potatoes plants fertilized with low rates of N accumulated less TSS in leaves than those properly fertilized. The opposite occurred with content of starch. The cultivars showed similar responses to five doses of N in relation to contents of starch and TSS. However, the response to the increase in doses of N for RS, NRS and Starch/NRS is cultivar-specific. The correlations between contents of RS, NRS and Starch/NRS with the starch and TSS were dependent on the potato cultivar.

Effect of Zeolite on Nitrogen Use Efficiency and Physiological and Biomass Traits of Amaranth (Amaranthus hypochondriacus) Under Water-Deficit Stress Conditions

“…It has also been reported that plants increase the compounds like carbohydrates, to maintain osmotic balance and get the ability to absorb more water from the rhizosphere in order to improve osmotic adjustment (Abdalla and El-Khoshiban 2007). Soluble sugars prevent the dehydration of proteins and cell membranes due to maintaining turgidity in stressed leaves (Braun et al 2016). In this study, sugar accumulation can be considered as one of the mechanisms of drought resistance in amaranth plant because there was a significantly negative correlation (r = − 0.88**) between soluble sugars and proteins (data not shown).…”

“…The reason for the reduction of soluble carbohydrates in the presence of N can be attributed to the key role of nitrogen element in the production of amino acids. The biosynthesis of amino acids requires the use of some Calvin cycle metabolites, which necessitates the consumption of the carbohydrates and their derivatives (Braun et al 2016).…”

Application of Cow Manure and Trichoderma sp. on Ex-mining Land to Improve Soil Chemical Properties and Fragrant Lemongrass (Cymbopogon nardus L.) Growth

“…All three of these processes require carbohydrates because the carbohydrates that are formed will be compounded with nitrogen compounds to form protoplasm at growing points, which will affect plant height increase. The availability of carbohydrates concentration formed in plants is influenced by the nitrogen fertilization rate (Braun et al, 2016).…”

Effect of vermicompost and tuber size on total soluble solids, sucrose and skin color of potato under ambient storage condition

“…TSS increased due to provide enough food for sprouting and respiration purposes (Kumar et al 2004). A positive correlation (r = 0.8225) was found between TSS and sucrose of potato tuber ( Figure 5) (Braun et al 2016). TSS decreased with the increasing of vermicompost levels.…”