低温胁迫下解放钟枇杷幼果细胞超微结构的变化

以解放钟枇杷幼果为试验材料，采用人工降温方法，研究低温胁迫下枇杷幼果超微结构的变化。结果表明：6℃、3℃低温胁迫时，解放钟果肉细胞质膜、液泡膜清晰，叶绿体、线粒体结构没有明显的变化；0℃低温处理条件下的原生质膜结构完整，少数叶绿体出现部分解体，双层膜有部分破裂现象，线粒体结构仍清晰可见；-3℃低温胁迫下，原生质膜、液胞膜均破裂，原生质体浓缩，叶绿体扭曲变形、相互融合，线粒体膜结构受损，脊消失。

Ultrastructural Changes of Jiefangzhong Loquat Young Fruits under Low Temperature Stress

Under controlled temperature conditions, the ultrastructural changes of young fruit Jiefangzhong loquat were studied. The main results are as follows： Under 6 ℃, 3 ℃ stress, plasma membrane and tunoplast could be clearly observed and chloroplasts and mituchondria did not show any significant changes. Under 0℃ stress, plasma membrane and mituchondrion structures were still in its integrity; a few chloroplasts was decomposed and their membrane structure was destroyed. Under-3 ℃ stress, both plasma membrane and tunoplast were broken; protoplasts were condonsed greatly; grana lamellace were twisted and disordered and even fused; membrane system of mituchondria was destroyed and cristae disappeared.