Effect of Nitrogen and Potassium Stress and Cultivar Differences on Potassium Ions and Nitrate Uptake in Sugarcane

Subasinghe, Ranjith

doi:10.1080/01904160600649146

Cited by 16 publications

(15 citation statements)

References 46 publications

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“…This is in contrast with studies showing a luxury consumption of other nutrients when the N supply rate is low (Jupp and Newman, 1987), but it is in agreement with studies showing that a weak P deficiency may develop in plants subjected to deficient N availability (Ashraf et al, 2001;Gutierrez-Boem and Thomas, 2001). Decline in foliar K concentration in N-deprived seedlings may reflect a reduced demand for K resulting from the decrease in growth rate (Jarvis et al, 1990;Subasinghe, 2006). The increase in root K concentration resulting from a reduction in growth rate may N ¼ 10 plants).…”

Section: Discussionsupporting

confidence: 46%

Short-term nitrogen deprivation increases field performance in nursery seedlings of Mediterranean woody species

Trubat

Cortina

Vilagrosa

2008

Journal of Arid Environments

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Section: Discussionsupporting

confidence: 46%

Short-term nitrogen deprivation increases field performance in nursery seedlings of Mediterranean woody species

Trubat

Cortina

Vilagrosa

2008

Journal of Arid Environments

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“…Long term K stress for a 3 1/2-month reduced the root capacity to absorb NO 3 − of sugarcane as shown by lower initial NO 3 − uptake rates and lower Vmax and increased Km for NO 3 − uptake at 0.02 and 0.2 mM K (Subasinghe 2006). Long term N stress reduced the initial K + uptake rates and decreased the affinity of roots for K + , as indicated by increasing Km and decreasing Vmax for K + uptake with decreasing N availability.…”

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

confidence: 97%

“…Furthermore, there were genetic differenecs in the response of K + uptake to N stress (Subasinghe 2006). A drought and salinity resistant cultivar showed greater adaptability to a low-nutrient environment due to its higher root allocation and affinity for NO 3 − and K + under N and K stress, suggesting that the resistance of sugarcane to multiple stresses may involve a general stress-response system (Subasinghe 2006). Potassium deprivation in general induces changes in the relative growth of roots, nodules, and shoots rather than changes in N and/or carbon uptake rates per unit mass or area of these organs (Hogh-Jensen 2003).…”

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

confidence: 98%

“…Long term N stress reduced the initial K + uptake rates and decreased the affinity of roots for K + , as indicated by increasing Km and decreasing Vmax for K + uptake with decreasing N availability. Furthermore, there were genetic differenecs in the response of K + uptake to N stress (Subasinghe 2006). A drought and salinity resistant cultivar showed greater adaptability to a low-nutrient environment due to its higher root allocation and affinity for NO 3 − and K + under N and K stress, suggesting that the resistance of sugarcane to multiple stresses may involve a general stress-response system (Subasinghe 2006).…”

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

confidence: 99%

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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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“…2004, Romero‐Aranda et al. 2006, Subasinghe 2006). Potassium contents in plant tissues progressively decrease with increasing salinity.…”

Section: Introductionmentioning

confidence: 99%

Potassium and Silicon Improve Yield and Juice Quality in Sugarcane (Saccharum officinarum L.) under Salt Stress

Ashraf¹,

Rahmatullah²,

Ahmad³

et al. 2009

J Agronomy Crop Science

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Soil salinity is a major abiotic stress which adversely affects the yield and juice quality in sugarcane. However, the mineral nutrient status of plant plays a crucial role in increasing plant tolerance to salinity. We investigated the effects of K and/or Si on plant growth, yield and juice quality in two sugarcane genotypes differing in salinity tolerance. Addition of K and Si significantly (P ≤ 0.05) increased K and Si concentrations and decreased the accumulation of Na+ in plants under salt stress. Cane yield and yield attributes were significantly (P ≤ 0.05) higher where K and Si were added. Juice quality characteristics like Brix (% soluble solids in juice), Pol (% sucrose in juice), commercial cane sugar (CCS) and sugar recovery in both sugarcane genotypes were also significantly (P ≤ 0.05) improved with the supplementation of K and Si. For most of the growth parameters, it was found that K either alone or in combination with Si was more effective to alleviate salt stress in both sugarcane genotypes than Si alone. Moreover, the beneficial effects of K and Si were more pronounced in salt sensitive genotype than in salt tolerant genotype. The results suggested that K and Si counteracted the deleterious effects of high salinity/sodicity in sugarcane by lowering the accumulation of Na+ and increase in K+ concentration with a resultant improvement in K+/Na+ ratio which is a good indicator to assess plant tolerance to salinity.

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Effect of Nitrogen and Potassium Stress and Cultivar Differences on Potassium Ions and Nitrate Uptake in Sugarcane

Cited by 16 publications

References 46 publications

Short-term nitrogen deprivation increases field performance in nursery seedlings of Mediterranean woody species

Short-term nitrogen deprivation increases field performance in nursery seedlings of Mediterranean woody species

Potassium nutrition of crops under varied regimes of nitrogen supply

Potassium and Silicon Improve Yield and Juice Quality in Sugarcane (Saccharum officinarum L.) under Salt Stress

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