Translocation of Labelled Assimilate in Potassium‐deficient Plants

Thrower, Stella L.; Thrower, L. B.

doi:10.1111/j.1469-8137.1976.tb04644.x

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Indeed, there is evidence from several plant species including tomato (Mengel and Viro 1974), potato (Haeder et al 1973), bean (Cakmak et al 1994a,b), cotton (Ashley and Goodson 1972) and sugarcane (Hartt 1969) that K deficiency inhibits sugar translocation. However, an analysis of nine crop species (Thrower and Thrower 1976) found no indication for decreased translocation of photosynthates from the source leaf into stem, root and apex in K‐deficient plants, or even increased translocation in the case of maize and millet. K nutrition might also impact on the concentrations of nitrogen assimilates in the phloem.…”

Section: The Effect Of K Nutrition On Primary Metabolismmentioning

confidence: 99%

The effect of potassium nutrition on pest and disease resistance in plants

Amtmann

Troufflard

Armengaud

2008

Physiologia Plantarum

413

246

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Providing a fast growing world population with sufficient food while preserving ecological and energy resources of our planet is one of the biggest challenges in this century. Optimized management of chemical fertilizers and pesticides will be essential for achieving sustainability of intensive farming and requires both empirical data from field trials and advanced fundamental understanding of the molecular processes controlling plant growth. Genes involved in plant responses to nutrient deficiency and pathogen/herbivore attack have been identified, but we are lacking information about the cross-talk between signalling pathways when plants are exposed to a combination of abiotic and biotic stress factors. The focus of this review is on the relationship between the potassium status of plants and their susceptibility to pathogens and herbivorous insects. We combine field evidence on potassium-disease interaction with existing knowledge on metabolic and physiological factors that could explain such interaction, and present new data on metabolite profiles and hormonal pathways from the model plant Arabidopsis thaliana. The latter provides evidence that facilitated entry and development of pathogens or insects in(to) potassium-deficient plants as a result of physical and metabolic changes is counteracted by an increased defence. A genetic approach should now be applied to establish a causal relationship between disease susceptibility on the one hand and individual enzymatic and signal components on the other. Once identified, these can be used to design agricultural strategies that support the nutritional status of the crops while exploiting their inherent potential for defence.

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Section: The Effect Of K Nutrition On Primary Metabolismmentioning

confidence: 99%

The effect of potassium nutrition on pest and disease resistance in plants

Amtmann

Troufflard

Armengaud

2008

Physiologia Plantarum

413

246

View full text Add to dashboard Cite

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“…K deficiency could result in the accumulation of carbohydrates, especially of soluble sugars, in leaves (Amtmann et al 2008). However, a study on nine crop species showed that K deficiency does not limit the translocation of photosynthates from the source leaves into stems and roots (Thrower and Thrower 1976). Previous studies have indicated that K + is a major osmoticum that contributes on average between 35 and 50% of a cell's osmotic potential (Shabala and Pottosin 2014).…”

Section: Different Responses Of P Cathayana Females and Males To K Dmentioning

confidence: 99%

Male poplars have a stronger ability to balance growth and carbohydrate accumulation than do females in response to a short‐term potassium deficiency

Yang

Jiang

Wang

et al. 2015

Physiologia Plantarum

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Potassium (K) deficiency influences plant performance, such as ion uptake and carbohydrate transport. However, little is known about differences between males and females in response to K deficiency. In this study, dry matter accumulation, photosynthetic capacity, allocation patterns of K + , Na + and carbohydrates, and ultrastructural changes in males and females of Populus cathayana exposed to K deficiency were investigated. The results indicated that males maintained a significantly higher K + content and K + /Na + ratio in leaves and stems than did females under K deficiency. Moreover, K deficiency significantly increased the sucrose content of females, whereas no significant effect on males was detected. In addition, a comparative analysis showed that males allocated more resources to roots, while females allocated more to leaves, which resulted in sexually different root/shoot (R/S) ratios. Transmission electron microscopic (TEM) observations showed that males suffered fewer injuries than did females. These results suggested that males have a better ability to cope with K deficiency. In addition, the combined effects of salinity and K deficiency on poplars were studied. The results indicated that salt stress aggravates the negative effects caused by K deficiency. Taken together, our study provided evidence for gender-specific strategies in ion and carbohydrate allocation in poplars exposed to a short-term K deficiency. In leaves and stems, the lower K + accumulation inhibited sucrose translocation and resulted in a decreased R/S ratio, which may contribute to males having a stronger ability to balance growth and carbohydrate accumulation when compared with females.

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Potassium in Plants

Amtmann

Rubio

2012

Encyclopedia of Life Sciences

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Potassium (K) is an essential macronutrient for plants involved in many physiological processes. It is important for crop yield as well as for the quality of edible parts of crops, as it is also required in human nutrition. Although K is not assimilated into organic matter, K deficiency has a strong impact on plant metabolism. Plant responses to low K involve changes in the concentrations of many metabolites as well as alteration in the transcriptional levels of many genes and in the activity of many enzymes. Today, these changes can be studied with high throughput technologies that allow a quantitative description of metabolic responses to K deprivation at multiple levels. To ensure K nutrition, plant roots are endowed with high‐ and low‐affinity uptake systems, some of which have been identified and characterised over the last decades of research. Key Concepts: K is an essential macronutrient required for plant growth and development. K deficiency affects many essential physiological and metabolic processes. The K status determines the profile and distribution of primary metabolites in plant tissues. K nutrition is closely related to sugar allocation, nitrogen assimilation and amino acid levels. High‐throughput technologies allow researchers to determine simultaneously a large number of metabolites, transcript levels and enzyme activities in response to K supply. K deficiency leads to build‐up of sugars, down‐regulation of nitrate uptake and synthesis of nitrogen‐rich amino acids. Roots are endowed with high‐ and low‐affinity K uptake systems that ensure K nutrition in a wide range of external concentrations. hak5 transporters mediate high‐affinity K uptake and akt1 channels mediate low‐affinity K uptake. Under certain conditions akt1 channels can also mediate K uptake from very low concentrations. Additional unidentified systems may also promote root K uptake.

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Translocation of Labelled Assimilate in Potassium‐deficient Plants

Cited by 3 publications

References 6 publications

The effect of potassium nutrition on pest and disease resistance in plants

The effect of potassium nutrition on pest and disease resistance in plants

Male poplars have a stronger ability to balance growth and carbohydrate accumulation than do females in response to a short‐term potassium deficiency

Potassium in Plants

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