不同钾效率水稻品种苗期的根系形态与生理指标  

Root morphological and physiological characteristics in rice varieties with different potassium utilization efficiencies

作　　者：张宁[1] 郭荣发[1] 

机构地区：[1]广东海洋大学农学院,湛江524088

出　　处：《江苏农业学报》2014年第4期716-720,共5页Jiangsu Journal of 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：选用2个钾高效型和2个钾低效型水稻品种为试验材料,通过水培试验,研究了5 mg/L和40 mg/L两个钾水平下,水稻苗期根系形态与生理指标的差异及其与钾素利用率的相关性。分析表明,其根系干质量、根系体积、总吸收面积、α-NA氧化量,在相同的供钾水平下,钾高效水稻品种均大于钾低效型;在40 mg/L供钾水平下,不管是钾高效型还是钾低效型水稻品种,根系干质量、根系体积、总吸收面积、α-NA氧化量均大于5 mg/L供钾水平下的。相关性分析结果表明,水稻相对钾素利用效率与其相对根系干质量、相对活跃吸收面积比、相对比表面积相关性不显著,而与相对根冠比之间呈显著正相关,与相对根体积、相对α-NA氧化量、相对活跃吸收面积、相对总吸收面积呈极显著或显著的负相关关系。说明,良好的根系形态和根系活力是钾高效水稻品种的一种特征,相对根冠比、相对根体积、相对α-NA氧化量、相对活跃吸收面积、相对总吸收面积可以作为苗期钾高效水稻基因型的筛选指标。Two potassium efficient（ KE） and inefficient （ KIE） rice varieties were chosen as experimental materials to study the difference in root morphological and physiological indexs and their relationships with postassium utilization effi-ciency at seedling under two potassium levels（5 mg/L and 40 mg/L） by hydroponic culture. Results showed that the indexs of root morphology and physiology including the root dry weight, root volume, total absorbing surface area of root, active ab-sorbing surface area of root, root oxidation ability of α-NA in KE rice were all higher than those in KIE rice type. All the indexs of both rice types at 40 mg/L potassium application level are greater than those at 5 mg/L potassium level. The rela-tive potassium utilization efficiency has no significant correlation with relative root dry weight（ RRDW） , relative ratio of ac-tive absorbing surface area to total absorbing surface area（ RRAT） , relative ratio of total absorbing surface area to volume （ RRTV） , was positively correlated with relative ratio of root/shoot（ RRRS） and was negatively correlated with relative root volume（RRV）, relative root oxidation ability of α-NA, relative root active absorbing surface area （RRAA）and total ab-sorbing surface area（TASA）. Potassium-efficient rice is characterized by good root morphology and root activity. There-fore, RRRS, RRV, RRAA and TASA could serve as indexes for selecting potassium-efficient rice germplasm.

关 键 词：钾高效 钾低效 根系形态 生理指标 

分 类 号：S511.01[农业科学—作物学]