Grain chalkiness characters of the compact panicle type rice (CPR) was improved using the loose panicle type rice line (EG23) with larger length-width ratio of brown rice.

• 摘要采用籽粒长宽比较大、穗部着粒密的散穗型材料(EG23)改良粳稻密穗型品种的籽粒垩白性状。