玉米自交系耐低磷特性鉴定

采用温室内盆栽法鉴定63 份玉米自交系的耐低磷特性。以相对值表示性状的耐低磷特性，以综合指数表示自交系的整体耐低磷能力，用群体逐级分类法划分耐性级别。结果表明，低磷胁迫严重影响玉米苗期长势，低磷胁迫下自交系的相对存活叶、相对株高、相对茎粗、相对根干重与相对茎叶干重极显著正相关，可以作为评价玉米苗期耐低磷特性的相关指标；耐性分级发现，3(11629-2)、6(11583-1)、8(11527-3)、26(11542-2)、34(11511-1)、35(178)、41(537)、51(18599 白)、52(CML94)和53(18599 红) 10 份自交系高耐(HT)低磷，15(11492-1)、21(11455-1)、22(11578-4)、23(11571-1)、24(11546-1)、29(11523-2)、36(48-2)、43(CML206)、57(chang7-2)和61(ES40) 10 份自交系对低磷胁迫高度敏感(HS)，其余材料表现为耐(T)、敏感(S)或中度敏感(MS)。

Identification of corn inbred lines withlow-phosphorus tolerance

Low -phosphorus tolerance of 63 corn inbred lines were identified through pot culture in greenhouse.Relative value was used to represent traits tolerance to low-phosphorus stress, corn total tolerance to low-phosphorus stresswas represented by comprehensive index, the tolerance degree was divided by population gradually classification method.The results showed that, low-phosphorus stress influenced corn seedling growth severely, the living leave number, plantheight, stem diameter, root dry weight significantly positively correlated with relative stems and leave dry weight, so thesetraits were reliable to evaluate maize tolerance to low-phosphorus stress. 10 lines including 3 (11629-2), 6 (11583-1), 8(11527-3) were highly tolerant (HT) to low-phosphorus stress, 10 lines including 15(11492-1), 21(11455-1), 22(11578-4)were highly sensitive (HS) to low-phosphorus stress, and the other lines were tolerant (T), sensitive(S) or middle sensitive(MS) to low-phosphorus stress.