求翻译：多聚半乳糖醛酸酶（Polygalacturonase，PG）是水解果胶物质的主要酶，在细胞壁结构的改变中起重要作用，并且一度被认为是控制果实软化的关键酶。本试验采用PCR技术克隆了桃PG基因，并用半定量RT-PCR的方法研究了PG基因在川中岛及其硬肉芽变-双久红桃果实不同发育时期的表达。试验结果表明，我们克隆到了桃内源PG基因，半定量表达结果显示，PG基因在两品种桃果实不同发育期的表达规律不同，揭示该基因可能对桃果实的质地变化起到至关重要的作用。是什么意思？

Poly-galacturonic acid enzymes (polygalacturonase, pg) is the main enzyme hydrolysis of pectin substances play an important role in the changes in the structure of cell walls, and was once considered a key enzyme in control of fruit softening. This test pcr technology to clone the gene of peach pg p

Multi-galacto-phenolic acid enzyme (Polygalacturonase PG) is hydrolysis, fruit enzymes, the main material in the cell wall changes in the structure of play an important role in, and is considered to be a softening in key control fruit enzyme. This experiment with cloning technology PCR PG gene, a co

Gathers the galacturonic acid enzyme (Polygalacturonase, PG) is the hydrolisis pectin substance essential en

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