求翻译：桃果实质地变化过程是由一系列生理生化变化过程组成，这些变化受到很多因素的影响，诸如：外界环境条件、植物生长调节激素和基因等，前人已经研究多种基因和酶的作用，本文主要想通过对PG基因的克隆与表达分析来研究PG基因对桃果实软化的影响及作用，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。本实验采用川中岛和双久红两个品种，用半定量RT-PCR的方法来进行PG基因的克隆与表达分析。试验结果表明，PG基因对桃果实的质地变化起到至关重要的作用。是什么意思？

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peach fruit real change is the process by which a series of physiological, biochemical processes of change, and these changes have been affected by many factors, such as: external environmental conditions, plant growth regulator, such as hormones and genes, have been studying a variety of enzymes an

The peach fruit quality of material change process is composed by a series of physiological biochemistry change process, these changes receives very many factors the influence, such as: The external environment condition, the plant growth adjustment hormone and the gene and so on, the predecessor al

Peach fruit texture changes process is by series physiological biochemical changes process composition, these changes was many factors of effect, such as: outside environment conditions, and plant growth regulation hormone and gene,, predecessors has research multiple gene and enzyme of role, this m

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