香稻种质稻米淀粉RVA谱特征分析

采用粘度速测仪分析了42份来自不同国家的香稻种质资源的稻米淀粉粘滞性谱(RVA谱)和特征值间的相关性。结果表明,香稻种质稻米淀粉RVA谱特征值差异显著,谱线分化明显,各个特征值与稻米直链淀粉含量的高低也具有较好的相关性。因此,在测定直链淀粉含量的基础上辅以RVA谱特征,可以用来评价稻米的蒸煮与食用品质和筛选优质水稻品种。

香稻种质资源与骨干亲本材料的农艺性状相关及通径分析

为摸清香稻种质资源与骨干亲本材料各农艺性状对其产量的影响,为香型杂交水稻育种提供优质资源材料,采用田间试验,对40份具有一定代表性的香稻种质资源、26份恢复系材料和22份保持系材料的农艺性状进行了相关和通径分析。结果表明:1)相关分析中,香稻种质资源的单株有效穗与单株产量呈极显著正相关(r=0.987 2**),恢复系材料的单株有效穗、穗实粒数和千粒重与单株产量呈极显著正相关(r=0.532 5**,0.509 1**,0.707 3**),保持系材料的生育期、剑叶宽、穗总粒数和穗实粒数与单株产量呈极显著正相关(r=0.611 6**,0.711 7**,0.563 2**,0.684 2**)。2)偏相关分析中,香稻资源的单株有效穗和千粒重与单株产量呈极显著偏相关(r=0.998 9**,0.639 5**),恢复系的单株有效穗、穗总粒数和千粒重与单株产量呈极显著正偏相关(r=0.810 0**,0.520 2**,0.7292**),保持系的单株有效穗和千粒重与单株产量呈极显著正偏相关(r=0.863 8**,0.594 5**)。3)通径分析中,香稻资源和恢复系材料农艺性状中的单株有效穗对单株产量的直接作用最大,而保持系材料的单株产量受穗实粒数的直接作用最大。

Comparison of Genetic Diversity Between Local Cultivated Aromatic and Non-aromatic Rice in Yunnan Province

[ Objective] The genetic diversity of the local cultivated aromatic rice and non-aromatic rice in Yunnan Province were compared to provide further genetic resources for breeding practice. [Method] Genetic diversity of 10 aromatic rice and 45 non-aromatic rice were analyzed by 64 SSR primers covered on 12 rice chromosomes. [ Result] Per locus 5.44 and 7.98 alleles in average were detected, ranging from 2 to 12 and from 2 to 17 in aromatic and non-aromatic rice, respectively. Average genetic multiplicity index（Hs） was 0.46 and 0.67 respectively. The average polymorphism information content （PIC） was 0.43 and 0.58 in aromatic and non-aromatic rice respectively. [ Conclusion] The results indicated that genetic diversity was higher in non-aromatic rice than in aromatic rice.