Potassium and Nitrogen Distribution Pattern and Growth of Flue-Cured Tobacco Seedlings Influenced by Nitrogen Form and Calcium Carbonate in Hydroponic Culture

Zou, Chunqin; Wang, Xiaofeng; Wang, Zhengyu; Zhang, Fusuo

doi:10.1080/01904160500320624

Cited by 19 publications

(10 citation statements)

References 22 publications

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“…Moreover, the flow and partitioning of K in tobacco plants can be modified depending on the forms of N supplied and nutrient levels. NH 4 + nutrition resulted in more K translocated to leaves than did NO 3 − supply in terms of the amounts of xylem-transported potassium in plants (Lu et al 2005;Zou et al 2005), although NH 4 + -N as the sole Nsource caused a decrease in potassium uptake relative to NO 3 − -N supply. When NH 4 + -N was supplied as the sole N-source, massive amounts of K were exported from leaves and cycled in the phloem, especially at low nutrient levels compared to NO 3 − -N or NH 4 NO 3 supply.…”

Section: K Uptake and Content In Plants Under Variable N Regimesmentioning

confidence: 82%

“…When NH 4 + -N was supplied as the sole N-source, massive amounts of K were exported from leaves and cycled in the phloem, especially at low nutrient levels compared to NO 3 − -N or NH 4 NO 3 supply. NH 4 + -N as the sole N-source also caused a reduction in transpiration rate, changes in plant water use efficiency and a decrease in K uptake (Wang et al 2003;Lu et al 2005;Zou et al 2005). However, there are other reports that roots treated with high levels of NO 3 − absorbed and translocated more K + ( 86 Rb) than seedlings treated with low levels of NO 3 − (Pettersson 1984;Zsoldos et al 2006).…”

Section: K Uptake and Content In Plants Under Variable N Regimesmentioning

confidence: 93%

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Potassium nutrition of crops under varied regimes of nitrogen supply

et al. 2010

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Nitrogen (N) over-application is a serious problem in intensive agricultural production areas with consequent large N losses and environmental pollution. In contrast to N, potassium (K) application has been neglected in many developing countries and this has resulted in soil K depletion in agricultural ecosystems and prevented increases in crop yields. Nitrogenpotassium interaction is currently a topic of interest in many studies and the focus of this review is K nutrition under varied N regimes. Nitrogen form and application rate and time influence soil K fixation and release, as well as K uptake, transport, cycling and reutilization within crops. High yielding quality crops can be obtained by optimal N: K nutritional ratios. High rates of applications of N and K do not necessarily lead to increased yield increments and may even reduce yield. Yield response to K uptake depends on N nutritional status and the interaction is usually positive when NO 3 − -N is supplied. Antagonism between NH 4 + and K + in uptake was mostly attributed to simple competitive effects in the past while evidence showing mixednoncompetitive interactions existed. Two components of membrane transport systems for K uptake by plants are a high-affinity K + transport system which is inhibited by NH 4 + and a low-affinity K + transport system which is relatively NH 4 + insensitive. Potassium is highly mobile within plants but its flow and partitioning can change depending on the forms of N supply. NH 4 + nutrition in comparison to NO 3 − -supply results in more K translocation to leaves. A better understanding of the mechanism of N-K interaction can be a useful guide to best nutrient management in agricultural practice in order to achieve high yields with high nutrient use efficiency.

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Section: K Uptake and Content In Plants Under Variable N Regimesmentioning

confidence: 82%

Section: K Uptake and Content In Plants Under Variable N Regimesmentioning

confidence: 93%

Potassium nutrition of crops under varied regimes of nitrogen supply

et al. 2010

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“…Usually, in hydroponic culture in a greenhouse, maximum growth and yield of tomato or pepper is obtained with an optimal NH 4 + concentration not exceeding 30% of total N (Takács and Técsi 1992;Sandoval-Villa et al 2001;Claussen 2002;Xu et al 2001Xu et al , 2002. The superiority of mixed N forms to either form alone is related to the maintenance of nearly neutral pH (Marschner 1995), higher uptake of phosphorous, potassium, calcium and iron, etc., in mixed N forms than with either single NO 3 − or NH 4 + (Stratton et al 2001;Zou et al 2005;Kotsiras et al 2002), avoiding excessive consumption of carbohydrate upon NH 4 + assimilation at the expense of root growth (Schortemeyer et al 1993;Schortemeyer and Feil 1996;Salsac et al 1987), and cytokinin (CTK) enhancement (Smiciklas and Below 1992;Fetene and Beck 1993;Wang and Below 1996). Cytokinin is widely accepted as a long-range signal in response to NO 3 − for regulation of leaf growth at the whole plant level Rahayu et al 2005;Takei et al 2002).…”

Section: Introductionmentioning

confidence: 96%

“…The optimal proportions of NO 3 − to NH 4 + for plant growth depend on plant species, environmental conditions, developmental stage and the total concentration of supplied nitrogen (N) (Chaillou et al 1991;Xu et al 1992;Stratton et al 2001;Zou et al 2005;Kotsiras et al 2002;Xu et al 2001Xu et al , 2002Claussen 2002). Usually, in hydroponic culture in a greenhouse, maximum growth and yield of tomato or pepper is obtained with an optimal NH 4 + concentration not exceeding 30% of total N (Takács and Técsi 1992;Sandoval-Villa et al 2001;Claussen 2002;Xu et al 2001Xu et al , 2002.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a homogeneous or localized supply of NO 3 − and NH 4 + could have a great effect on the regulation of plant growth. Many studies have shown that when roots are supplied a moderate N concentration completely by sole NH 4 + nutrition, the growth of roots, shoots, and even fruits is usually significantly inhibited (Schortemeyer et al 1997;Zou et al 2005;Claussen 2002;Wang et al 2003;Chaillou et al 1994;Feil 1994). However, if the roots were spatially half supplied with sole NH 4 + and half with sole NO 3 − , roots in the sole NH 4 + part suffered from depressed growth (Guo et al 2002(Guo et al , 2007Chaillou et al 1994), whereas the shoots were still able to accumulate a high dry matter (DM) content.…”

Section: Introductionmentioning

confidence: 99%

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Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Shen

et al. 2008

Plant Soil

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In order to investigate the effects of homogeneous and localized supply of different nitrogen forms (nitrate, NO 3 − vs ammonium, NH 4 + ) on the growth of tomato seedlings, root morphology and six cytokinin (CTK) fractions in xylem sap were analyzed. Whole roots were supplied with different ratios of NO 3 − to NH 4 + (100:0, as 100-0NA; 75:25, as 75-25NA; 50:50, as 50-50NA) under homogeneous supply. In split-root experiments, three treatments were compared: a sole NO 3 − supply (N|N), a spatially separated supply of NO 3 − and NH 4 + (N|A), and a spatially separated supply of NO 3 − and a mixture of NO 3 − and NH 4 + nutrition at a ratio of 75:25 (N|AN). All concentrations of total N were set at 5 mM. The results showed that (1) homogeneous 75% NO 3 − plus 25% NH 4 + supply to the whole root zone led to maximum shoot and root dry matter (DM), root surface area (RS) and root volume (RV). The spatially separated supply of NO 3 − and NH 4 + (N|A) resulted in a contrasting effect on root morphology: in comparison to N|N, root DM in the NO 3 − -containing pot was increased by 50% whereas it was depressed by 50% in the NH 4 + -containing pot. The 75% NO 3 − plus 25%NH 4 + supply in the split-root experiment led to no significant effects either on shoot DM and root DM, or on RS and RV when compared to N|N. (2) The presence of NH 4 + in the external medium led to a significantly reduced total xylem-CTK concentration, and a close negative correlation was found between xylem NH 4 + and total CTK concentration irrespective of culture mode. A relatively high level of zeatin riboside (ZR) was maintained both in 75-25NA and N|A treatments. It was concluded that, in addition to the percentage of NH 4 + to NO 3 − in the nutrient solution, whether NH 4 + was supplied to the whole root system or to only part of the root system was also an important factor affecting plant growth. The fact that the 75-25NA and N|A treatments resulted in optimal growth of tomato seedlings might be attributed to the higher ZR concentration in xylem.

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Increased photosynthetic capacity in response to nitrate is correlated with enhanced cytokinin levels in rice cultivar with high responsiveness to nitrogen nutrients

Song

Sun

et al. 2013

Plant Soil

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Potassium and Nitrogen Distribution Pattern and Growth of Flue-Cured Tobacco Seedlings Influenced by Nitrogen Form and Calcium Carbonate in Hydroponic Culture

Cited by 19 publications

References 22 publications

Potassium nutrition of crops under varied regimes of nitrogen supply

Potassium nutrition of crops under varied regimes of nitrogen supply

Effects of different nitrogen forms on the growth and cytokinin content in xylem sap of tomato (Lycopersicon esculentum Mill.) seedlings

Increased photosynthetic capacity in response to nitrate is correlated with enhanced cytokinin levels in rice cultivar with high responsiveness to nitrogen nutrients

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