早籼稻垩白形成中胚乳淀粉粒发育的电镜观察

对不同垩白度早籼品种中优早3号（少垩白）和泸红早1号（多垩白）的不同温度处理下的胚乳淀粉粒进行了扫描电镜观察，结果显示胚乳腹部淀粉粒形成的发育过程明显受温度条件的影响。在灌浆初始，高温促使淀粉粒发育进程提前，淀粉粒形状呈圆球形，边缘光滑，从而造成成熟时淀粉粒间的空隙明显，结构疏松，垩白率高。这在少垩白品种中优早3号中表现得尤为显著。

Observation on the Starch Grain Development in Endosperm of Early Indica Rice During Chalkiness Formation with Scanning Electronic Microscope

The morphological traits of starch grain development of endosperm belly in indica rice varieties Zhongyouzao 3(less chalky) and Luhongzao 1(much chalky) were observed with scanning electronic microscope. The results showed that temperature had much influence on development of starch grains of endosperm belly. At initial grain filling, high temperature caused development of starch grains advanced. The starch grains were of elliptic or ball shape and smooth edge, so that the starch grains were more porous and less arrangement at ripening stage. More chalkiness were resulted. This effect could be clearly showed in less chalky rice variety Zhongyouzao 3.