Interactive Effects of Salinity and Phosphorus Nutrition of the Concentrations of Phosphate and Phosphate Esters in Mature Photosynthesizing Corn Leaves

Nieman, R. H.; Clark, Robert A.

doi:10.1104/pp.57.2.157

Cited by 93 publications

(46 citation statements)

References 24 publications

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“…In fact, salinity likely enhances P absorption (Roberts et al, 1984;Marschner, 1995;Navarro et al, 2001). However, toxic leaf P concentration can also be reached faster in plants grown in saline environments (Nieman and Clark, 1976;Grattan and Maas, 1984;Grattan and Grieve, 1999). On the other hand, P accumulation in salt-stressed plants could be a consequence of reduced translocation associated with a decreased demand for growth.…”

Section: Values Of F Testmentioning

confidence: 99%

Morpho-physiological responses of cowpea leaves to salt stress

Lacerda¹,

Júnior²,

Filho³

et al. 2006

Braz. J. Plant Physiol.

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Respostas morfofisiológicas de folhas de feijão-de-corda ao estresse salino: Neste trabalho estudou-se a influência do estresse salino sobre as respostas morfológicas e fisiológicas de diferentes tipos de folhas de plantas de feijão-de-corda [Vigna unguiculata (L.) Walp.], buscando-se entender o processo de aclimatação da planta ao estresse salino. Sementes selecionadas foram semeadas em vermiculita e, após 7 d as plântulas foram transferidas para bandejas de plástico contendo solução nutritiva, e mantidas em casa de vegetação. Após a emergência do primeiro trifólio, as plantas foram transferidas para vasos contendo 3 L de solução nutritiva, deixando-se apenas uma planta por vaso. Utilizou-se um tratamento-controle (sem adição de NaCl) e um salino (75 mmol L -1 de NaCl), iniciando-se a adição parcelada do NaCl (25 mmol L -1 por dia) 5 d após o transplantio para os vasos. Durante o período experimental, foram realizadas, na folha primária e nas 1 a , 2 a e 3 a folhas trifolioladas a partir da base da planta, as seguintes avaliações: área foliar, grau de suculência, massa específica, teores de íons, teor de clorofila e a taxa fotossintética líquida. No final do período experimental foram feitas as análises de crescimento da planta inteira. A salinidade não afetou a taxa fotossintética líquida, porém reduziu a produção de matéria seca e o número de ramos laterais. Os teores de Na, Cl, K e P aumentaram nas folhas de plantas estressadas, porém essas repostas foram especialmente influenciadas pelo tempo e pela idade da folha. Os maiores teores de Na e Cl nas folhas mais velhas podem contribuir para reduzir o acúmulo desses íons nas partes em crescimento, porém a tendência de acúmulo de K e P em folhas de plantas estressadas pode ser conseqüência da redução na retranslocação, não contribuindo para a aclimatação da planta ao estresse. Por outro lado, a salinidade aumentou a relação fonte/dreno, a suculência, a massa específica e o teor de clorofila por unidade de área foliar, sugerindo que essas mudanças observadas podem constituir parte de um processo integrado de aclimatação da planta ao estresse. Palavras-chave: aclimatação, fotossíntese, partição de fotoassimilados, salinidade, teores de íons The effect of salt stress of known intensity and duration on morpho-physiological changes in leaves of different ages from cowpea [Vigna unguiculata (L.) Walp.] plants was studied, aiming for a better understanding of the acclimation process of the whole-plant. Seeds were sown in vermiculite and seedlings were transferred to plastic trays containing aerated nutrient solution, and kept in a greenhouse. When the first trifoliate leaf emerged the seedlings were transplanted into 3 L plastic pots containing aerated nutrient solution. Salt additions started 5 d later, and the salt-treated plants received 25 mmol L -1 per day until reaching a final concentration of 75 mmol L -1 . During the experimental period primary leaves and the 1 st , 2 nd , and 3 rd trifoliate leaves were used for measurements of net photosynthesis, leaf area,...

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Section: Values Of F Testmentioning

confidence: 99%

Morpho-physiological responses of cowpea leaves to salt stress

Lacerda¹,

Júnior²,

Filho³

et al. 2006

Braz. J. Plant Physiol.

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“…2 mM vs. 2 mM). Several studies conducted in solution cultures have shown that P concentrations that are optimal in non-saline solutions may adversely affect growth or be toxic to corn (Bernstein et al, 1974;Nieman and Clark, 1976) as well as other agronomic crops grown under saline conditions. In these cases salinity by some unknown mechanism causes the plant to lose control of phosphate uptake (Roberts et al, 1984) and transport to the shoot.…”

Section: Phosphorusmentioning

confidence: 99%

Salinity–mineral nutrient relations in horticultural crops

Grattan

Grieve

1998

Scientia Horticulturae

1,192

738

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“…However, much of the early research was conducted at rather high levels of [P] medium , leading to artefactual increases in P transport rates (see Nieman & Clark, 1976 ;Grattan & Maas, 1985). Contrarily, in some of the cases where only a moderate [PO % − ] medium was used, P transport was inhibited, especially in young shoot tissues.…”

Section: Anionic Nutrientsmentioning

confidence: 99%

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

Lazof

Bernstein

1999

New Phytologist

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Most recent reviews of plant salinity response have included the concept of a nutritional disturbance as one likely mechanism by which shoot growth might be inhibited. None the less, few studies of dicotyledonous plants have presented data on nutrient transport into the most intensively growing shoot tissues. In this paper net nutrient deposition was followed for 3 d in 8 sequential, growing leaves of Lactuca sativa, which were grown either in conditions of moderate salinization, or in a growth-stimulating concentration of NaCl. The nutrient deposition was studied from 0.7 to 3.7 d following completion of stepwise salinization. This deposition was followed in immature leaves, which had attained only 1-2 % of ultimate leaf mass by the completion of the study. In such young leaves development is still dominated by cell division. The transport of Ca# + specifically to the youngest leaves was reduced by more than twice as much as was K + transport. Transport of the other major divalent cationic nutrient, Mg# + , was not decreased for these leaves. The factors of increase for Na + and Cl − after 3.7 d after completion of salinization averaged 152 and 62 % over control levels for the three youngest leaves (for Na + and Cl − , respectively). Though significant, these increases were only 27 and 14 % as great as increases in three leaf sets of more developed growing leaves. Decreases in net K + deposition and leaf K + concentration were not greater for the youngest than they were for the oldest leaves. Net S deposition was reduced 44 % more in younger than older growing leaves, but for most leaves not beyond the level expected due to reduced sink strength. The reduction in net P deposition also seemed more related to reduced sink strength, but was reduced to approx. 50 % in both younger and more developed growing leaves. While Fe concentration was not reduced by salinization at any developmental stage, Zn# + net transport and Zn concentration were both reduced in the two youngest leaves (57 and 70 %, respectively). Given the moderate treatment imposed (Na : Ca ratio of 22) the results suggest that Ca# + transport to the youngest leaves is probably highly sensitive to salinization of the root medium and is perhaps a key physiological response in the inhibition of leaf growth.

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Interactive Effects of Salinity and Phosphorus Nutrition of the Concentrations of Phosphate and Phosphate Esters in Mature Photosynthesizing Corn Leaves

Cited by 93 publications

References 24 publications

Morpho-physiological responses of cowpea leaves to salt stress

Morpho-physiological responses of cowpea leaves to salt stress

Salinity–mineral nutrient relations in horticultural crops

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

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