水稻苗期钾高效种质资源的筛选与评价  

Screening and evaluation of rice germplasm resources with high potassium efficiency at seedling stage

作　　者：张宁[1] 郭荣发[1] 

机构地区：[1]广东海洋大学农学院,广东湛江524088

出　　处：《广东农业科学》2014年第9期1-4,共4页Guangdong Agricultural Sciences

基　　金：广东省现代农业产业技术体系岗位专家项目(B11192)

摘　　要：通过设置低钾(5 mg/L)胁迫和正常供钾(40 mg/L)2个处理水平的苗期水培试验,采用相对耐低钾指数为评价指标、方差分析及主成分分析的方法,对18个不同水稻品种进行钾高效种质资源的筛选与评价。方差分析表明:16个钾效率的相关性状在18个水稻基因型间的差异均达到显著或极显著水平。主成分分析表明,前5个主成分累计贡献率达到90.972%,已包含了大部分的信息,能够基本反映整体状况。其中相对植株干重、相对茎叶干重、相对根部干重、相对根冠比、相对茎叶吸钾量、相对植株吸钾量在5个主成分中的比重较大,可以作为水稻苗期钾高效种质资源筛选的指标。综合评价结果表明:湛优2009得分最高、为2.2753分,特优524次之、为2.2545分,均为最耐低钾水稻品种;黄丰占、黄华占、博优晚三、Ⅱ优3550等6个品种为中等耐低钾水稻品种;博优043得分最低、为-1.8583分,为低钾敏感型水稻品种。Tighteen different rice varieties were screened and evaluated for low potassium stress（5 mg/L） and normal（40 mg/L） in hydroponic culture at seedling stage by adopting relatively low potassium tolerance index and variance and principal component analysis method. Variance analysis showed that there was significant or very significant differences in16 potassium efficiency related traits among 18 rice genotypes. Principal component analysis showed that the accumulation contribution rate for first five principal components reached 90.972%, which implied that they contained most of the information to reflect the all trait resource. The proportions of relative plant dry weight, shoot dry weight, root dry weight,root/shoot ratio, shoot potassium uptake and plant potassium uptake in the five principal components were higher, so they could be used as screening index of rice potassium efficiency germplasm resources screening at seedling stage. The comprehensive evaluation results showed that the highest score（2.2753） was ＂Zhanyou 2009＂ and the second was ＂Teyou524＂（2.2545）, both were the best potassium tolerance rice varieties; Huangfengzhan, Huanghuazhan, Boyouwan3, Ⅱyou3550 etc. were medium potassium tolerance varieties; the least score（-1.8583） was ＂Boyou043＂, it was low potassium sensitive varieties.

关 键 词：水稻 耐低钾 种质资源 苗期 水培 

分 类 号：S511.032[农业科学—作物学]