不同基因型红花种质耐低磷筛选指标的鉴定及评价

[目的]获得耐低磷红花种质的形态鉴定指标,并选择磷高效红花种质。[方法]利用水培营养形成的低磷素水平和正常磷素水平对17份红花种质进行耐低磷筛选指标的鉴定及其综合评价。[结果]低磷胁迫下,除根冠比外,苗高、叶长、叶宽、主根长、侧根数、根鲜重、地上部鲜重和根体积这8个指标的生长发育迟缓,但不同品种不同指标间受低磷胁迫后的变异幅度不同。不同基因型红花种质耐低磷能力差异显著,耐低磷能力较强的3份红花种质分别是"原阳红花-3""封丘红花-1"和"永城红花";相对根体积、相对根鲜重和相对地上部鲜重可以作为红花耐低磷种质的筛选指标,可利用红花苗期耐低磷能力的回归模型对红花进行耐低磷能力预测。[结论]筛选出耐低磷能力较强的红花种质,将为培育耐低磷红花新品种和克隆相关磷高效基因提供基础材料。

Identifying and Evaluation of Different Genotypes Safflower with Low-phosphorus Tolerance

[Objective] The research aimed to obtain the morphological indexes of low-phosphorus safflower germplasm, and select the phos-phorus-efficient safflower germplasm.[ Method] Identifying and evaluating 17 differences genotypes safflower under low-phosphorus and nor-mal-phosphorus level through water culture experiment.[ Result] Under the low phosphorus stress,in addition to root-shoot ratio,the growth and development of the eight indicators were slow,such as seedling height, leaf length, leaf width, main root length, lateral root number, root fresh weight, aboveground fresh weight and root volume.But the variation range of different indexes of different varieties was different after low phosphorus stress.The ability of low-phosphorus tolerance of different genotypes safflower germplasm was significantly different,and the three safflower germplasm with low-phosphorus tolerance were"Yuanyang safflower-3","Fengqiu safflower-1" and"Yongcheng safflower".The rela-tive root volume, relative root fresh weight and relative fresh weight could be used as the screening index of safflower germplasm with low-phos-phorus tolerance.The regression model of the ability of low-phosphorus tolerance in safflower seedling could be used to predict the ability of low-phosphorus tolerance.[ Conclusion] Identifying and evaluating safflowers with low-phosphorus tolerance provide basic-materials for breeding new sesame varieties and cloning potassium high-efficient utilizing genes in the future.