Adaptation to environment of low-phytic acid soybean, and development of techniques for effective utilization of phosphorus resource

植酸（myo-inositol hexakis dihydrogen phosphate; IP 6; Phytate）是谷物中磷的主要贮存形式，是家畜饲料中磷的主要来源。然而，非反刍动物如猪和家禽不能获得P型IP 6，因为它们缺乏有效的内源酶来水解IP 6。由于磷的生物利用度差，非反刍动物排泄出它们消耗的种子磷的主要部分，并且由此产生的动物废物磷可以导致水污染。为了弥补磷的不足，人们在饲料中添加了来源于磷矿石储量的无机磷。为了解决植酸带来的问题，本研究选育了低植酸大豆基因型，以降低植酸含量，提高籽粒中有效磷的含量。研究了低植酸大豆对非反刍动物磷排泄的影响，旨在建立一种节约磷资源的技术。

Phytic acid (myo-inositol hexakis dihydrogen phosphate; IP6; Phytate) is the main storage form of phosphorus (P) in cereals, which used for feedstuffs to livestock. However, P form IP6 is not available to non-ruminant animals such as pigs and poultries as they lack effective endogenous enzymes for the hydrolysis of IP6. As a result of the poor bioavailability of P, non-ruminant animals excrete a major fraction of seed P they consume and the resulting animal waste P can contribute to water pollution. And, to make up for the deficiency of P, inorganic-P derived from finite phosphate rock reserves is added to feedstuffs. In order to solve the problems associated with phytate, in this study, low-phytate soybean genotypes which reduced the amount of phytate and increase available P in the seed was breeding. The low-phytate soybean was investigated whether effective to reduce P excretion by non-ruminant animals for establishing a technique of leading to savings of phosphate resources.