不同类型水稻品种品质性状间相互关系的分析

对211份不同类型水稻品种品质性状间的相关和偏相关分析表明：籼稻或粳稻加工品质间的偏相关系数均呈显著或极显著正相关。糙米率高的品种，其精米率和整精米率也高。籼稻的垩白率主要受粒长和长宽比的影响，粳稻则主经受长宽比的影响，但无论是籼稻或粳稻，垩白度与粒长和长宽比的偏相关均不显著。品质改良的重点是降低稻米的垩白率和垩白度，其关键是选择垩白性状较好。配合力较高的亲本。通过双交，复交，回交等方式增加优良亲本的比重，提高对垩白性状的选择压力等，稻米适口性的改良，应从早代开始，对所选材料进行感官品尝，并进行适口性的跟踪调查。结合其他品质性状进行综合选择。

Analysis on correlation and partial correlation of grain quality characteristics in different rice types

The analysis was conducted on correlation and partial correlation of gra in quality characteristics in 211di fferent rice types(indica and japonica varieties).The results were as follows:A positive significant partial correlatio n was found between milling quality characteristics in tested varietie s.The grain length and length /bread th are major factors to chalkness gra in in indica varieties,for japonica varieties ,length /breadt h is important.No partial correlati on was found between chalky area and g rain length or length /breadth in indica or japonica varieties.It is important to reduce chalkness grain and chalky area in quality b reeding.The key means to reduce chalkness grain and chalky area are as follows:Selecting high quality and high combining ability pare nts .Applying breeding ways such as double cross,multiple cross,back c ross and so on .Strengthening selection pressure for quality breeding to chalkness.The key means to improve paratability are as follows:Selecting and tasting rice quality from early generation ,continual reseachin g and synthetic selecting based on other quality characteristics.