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首页> 外文期刊>Plant and Soil >The growth and phosphorus utilisation of plants in sterile media when supplied with inositol hexaphosphate, glucose 1-phosphate or inorganic phosphate.
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The growth and phosphorus utilisation of plants in sterile media when supplied with inositol hexaphosphate, glucose 1-phosphate or inorganic phosphate.

机译：当供给六磷酸肌醇，1-磷酸葡萄糖或无机磷酸时，在无菌培养基中植物的生长和磷的利用。

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摘要

Seedlings of Trifolium subterraneum, T. repens, Medicago polymorpha, Phalaris aquatica, Lolium rigidum and Danthonia richardsonii, were grown for 19-24 days in sterile agar or sand-vermiculite media, in the presence of inorganic phosphate (Pi), glucose 1-phosphate (G1P) or inositol hexaphosphate (IHP). Agar (pH 5.0) had a low IHP-sorbing capacity while IHP was almost completely sorbed in sand-vermiculite. Pi and G1P were relatively available in both media. Growth of each species was measured in relation to phosphorus (P) supply and levels of Pi supply at which shoot yields reached 90% of maximum yield (Pcrit) were determined. Pcrit values were generally higher for the legume species than for the grasses, and were sixfold higher for T. subterraneumseedlings when grown in sand-vermiculite relative to agar. When supplied with G1P, seedlings of the six species grew as well as plants supplied with Pi. By contrast, IHP was a poor source of P for plant growth, even when supplied in agar at levels up to40-fold greater than Pcrit. Using the growth of T. subterraneum in the presence of IHP, it was calculated that roots released～0.09 nkat phytase g-1 root dry wt. per day, over 20 days of growth. By supplementing agar containing IHP with phytase from Aspergillus niger (E.C. 3.1.3.8; 0.012 nkat plant-1, or～1.3 nkat g-1 root dry wt.), sufficient P became available to enable T. subterraneum seedlings to grow as well as Pi-supplied plants. These results indicate that while pasture plants can quite effectively use P from some organic P sources (e.g. G1P), the acquisition of phytate-P is limited both by availability of substrate and the capacity of plant roots to hydrolyse available IHP.
机译：在无机磷酸盐（Pi），葡萄糖1-磷酸（G1P）或肌醇六磷酸（IHP）。琼脂（pH 5.0）的IHP吸附能力低，而IHP几乎完全吸附在sand石中。 Pi和G1P在两种媒体中相对可用。测量与磷（P）供给有关的每种物种的生长，并确定Pi的供应水平，在该水平下苗芽产量达到最大产量（Pcrit）的90％。在沙gar石中生长的豆类相对于琼脂而言，豆科植物的Pcrit值通常比草高，而地下T.seedseumseds的Pcrit值高六倍。当供应G1P时，六个物种的幼苗和供应Pi的植物都生长。相比之下，即使在琼脂中供应的IHP含量比Pcrit高40倍，IHP也不是植物生长的P来源。在IHP存在下，利用T.subterraneum的生长，计算出根释放量为〜0.09 nkat植酸酶g-1根干重。每天超过20天的增长。通过用黑曲霉（EC 3.1.3.8; 0.012 nkat plant-1或〜1.3 nkat g-1根干重）的植酸酶补充含IHP的琼脂，可获得足够的P以使T.subranneum幼苗生长以及Pi提供的植物。这些结果表明，虽然牧场植物可以相当有效地利用某些有机磷源（例如G1P）中的磷，但植酸磷的获取受到底物可用性和植物根部水解可用的IHP能力的限制。

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