Effect of phosphate application on phytin‐phosphorus and other phosphate fractions in developing wheat grains

Michael, B.; Zink, F. W.; Lantzsch, H. J.

doi:10.1002/jpln.19801430402

Cited by 34 publications

(14 citation statements)

References 14 publications

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“…18), with accumulation mainly during the first one-third of development (10) The lack of significant accumulation of any myo-inositol polyphosphates others than phytate, observed here for developing soybean seeds, agrees with reports for rice (1,15). The work with rice resulted in a proposed biosynthetic model (1) (1,11). Hence, altered rates ofphytate accumulation in the face ofaltered P translocation appear to play an important role in P homeostasis of developing seeds as was proposed earlier for potato tubers (16).…”

Section: Discussionmentioning

confidence: 79%

The Timing and Rate of Phytic Acid Accumulation in Developing Soybean Seeds

Raboy¹,

Dickinson²

1987

Plant Physiol.

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The time-course of phosphorus (P) accumulation in the phytic acid fraction of developing soybean (Glycine max [L.] Merr. cv 'Williams 79') seeds as well as the relation of phytic acid P to total P content were determined. Phytic acid was detected early in embryogenesis in fieldgrown soybeans and accumulated in a linear fashion throughout most of seed development. Although the observed rates of accumulation ranged from 18.7 micrograms phytic acid P per seed per day in pods positioned low on the plant to 33.6 micrograms in pods positioned high on the plant, the final concentrations were the same in all cases. Nearly all of the P translocated to developing seeds was incorporated into phytic acid from the third week after flowering until physiological maturity, with the sum of nonphytic acid P compounds remaining constant. Phytic acid accumulation was also linear throughout development when soybean plants were grown in solutions having nutrient P levels that ranged from severely limiting (2.0 milligrams P per liter) to excess (50 milligrams P per liter). However, there was a pronounced effect on rate of accumulation, which ranged from 7.2 micrograms phytic acid per seed per day with limiting nutrient P to 44.7 micrograms with excess P. The change in level of phytic acid accounted for most of the alteration in total seed P that was caused by altering the P status of the plants. These results support the view that phytic acid synthesis is involved in P homeostasis of the developing soybean seed.Phytic acid is the storage form of phosphorus (P) in seeds (1,5) and is considered an antinutrient by animal nutritionists because it reduces the bioavailability of trace elements such as zinc when grains are eaten by humans and nonruminant animals (8). The nutritional problem is especially serious with legume crops such as soybeans, because the phytic acid remains tightly bound to reserve proteins during standard processing procedures (8). Seed from soybean plants grown in the field contained 1.4 to 2.3% phytic acid, depending on the cultivar, and this compound accounted for 67 to 78% of total P in the mature seed (13). Phytic acid content was reduced to approximately 0.5% when plants were grown in nutrient solution having a low level of P (12). Seeds having only 0.5% phytic acid germinated well, and early seedling growth in sand that lacked nutrients was nearly as vigorous as that of controls having 1.5% phytic acid

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Section: Discussionmentioning

confidence: 79%

The Timing and Rate of Phytic Acid Accumulation in Developing Soybean Seeds

Raboy¹,

Dickinson²

1987

Plant Physiol.

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“…Low accumulation of P in maize kernels would reduce the content of phytate (Michael et al, 1980) which is thought to be responsible for mineral deficiency (Ca, Cu, Zn) both in animals and in man (Maga, 1982). Furthermore (fig 1c, d) Although the differences between the high yielding cultivars KUH 2301, KUH 2602, Pi hybrid 6181 and the CP hybrid remained almost unaffected by the extremely different growing conditions during the 2 seasons, the correlations between the grain nutrient concentrations of the cropping seasons were not significant (r = + 0.51, + 0.39 and + 0.14 for GNC, GPC and GKC respectively).…”

Section: Introductionmentioning

confidence: 99%

Genotype variation in grain nutrient concentration in tropical maize grown during a rainy and a dry seaon

Feil

Thiraporn²,

Geisler³

et al. 1990

Agronomie

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“…It is likely that the phytic acid content of mature soybean seeds could be altered for experimental purposes by varying the nutrient P supplied to the plants, because nutrient P level is positively correlated with phytic acid accumulation in mature seeds of several other crop plants (1,18,19). Furthermore, a single gene which regulates the uptake of nutrient P has been identified in soybeans (3,12).…”

mentioning

confidence: 99%

“…The accumulation of phytic acid in P-tolerant and P-sensitive soybean isolines treated with varying levels ofnutrient P, including a toxic P level, was also studied. In addition to the frequently studied relationships between phytic acid P and other seed P fractions (13,17,18), leaf P was determined to assess the P status of the plants under study and to learn whether this parameter also has value for predicting the phytic acid level of mature seeds. Sampling and Analysis.…”

mentioning

confidence: 99%

Effect of Phosphorus and Zinc Nutrition on Soybean Seed Phytic Acid and Zinc

Raboy¹,

Dickinson²

1984

Plant Physiol.

100

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ABSTRACrThe relationships between nutrient P and Zn levels and the phytic acid, P, and Zn concentrations in soybean (Glycine max L. Meff. cv 'Williams 79') seed were studied. Phytic acid increased linearly from 4.2 to 19.2 milligrams per gram as nutrient P treatment was varied from 2.0 to 50 milligrams per liter and Zn was held constant at 0.05 milligrams per liter. Leaf P concentration durini seed development was found to be closely related to the concentrations of seed P and phytic acid. Leaf and seed Zn concentrations both responded positively to increasing nutrient Zn treatment. The effects of P treatment on plant and seed P and phytic acid were largely independent of the effects of Zn treatment on leaf and seed Zn. Phytic acid to Zn molar ratios ranging from 3.6 to 33.8 were observed.The effects of nutrient P treatments on the concentrations of phytic acid, seed P, and leaf P were also studied in the P-sensitive (gene Ap) cultivars 'Harosoy' and 'Cark' and their respective P-tolerant (gene Np) near-isogenic lines L66-704 and L63-1677. In general, the positive relationships observed among nutrient P, leaf P, seed P, and phytic acid concentrations were similar to those observed in the studies with Williams 79. When fertilized with low or moderate nutrient P (2.5 and 25.0 milligrams P per liter, respectively) no significant differences in any parameter were observed between Harosoy or Clark and their respective P-tolerant isolines. When fertilized with high nutrient P (100 milligrams P per liter), Harosoy seed had a significantly higher concentration of phytic acid (30 milligrams per gram) than did seed of its P-tolerant nearisogenic line L66-704 (24.2 millirams per gram phytic acid) whereas no significant difference was observed between Clark and its P-tolerant near-isogenic line L63-1677 (22.8 and 21.6 milligrams per gram, respectively). Variation in the phytic acid concentrations in the mature seed of the cultivars and isolines more closely paralleled leaf P concentrations observed during seed development (49 days after flowering), than those observed at the onset of seed development (14 days after flowering). Electrophoresis and ion-exchange chromatography revealed that partially phosphorylated intermediates do not appear when phytic acid accumulation is greatly reduced by limiting the nutrient P or when accumulation is greatly accelerated by excess P.Phytic acid accounts for 60 to 80% of the total P in soybean seeds (24) and is a source of Pi for the seedlings. However, fertilizer P is lost when phytic acid is removed from the field along with the seeds at harvest. The phytic acid content of

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Effect of phosphate application on phytin‐phosphorus and other phosphate fractions in developing wheat grains

Cited by 34 publications

References 14 publications

The Timing and Rate of Phytic Acid Accumulation in Developing Soybean Seeds

The Timing and Rate of Phytic Acid Accumulation in Developing Soybean Seeds

Genotype variation in grain nutrient concentration in tropical maize grown during a rainy and a dry seaon

Effect of Phosphorus and Zinc Nutrition on Soybean Seed Phytic Acid and Zinc

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