糜子育成品种成株期抗旱性鉴定与评价

在年降雨量不足40 mm的甘肃省敦煌市,采用大田干旱胁迫法对我国不同地区育成的56份糜子品种成株期抗旱性进行了鉴定。结果表明,成株期干旱胁迫对糜子主茎节数、单株有效穗数、单株草重、主穗长、千粒重、比叶重影响不显著,而对株高、单株穗重、单株粒重、小区产量、旗叶面积、叶面积指数、生育期影响达到了极显著水平,干旱胁迫处理后株高降低了14.08 cm,单株穗重、单株粒重和小区产量分别下降2.65 g、2.19 g和86.18 g,旗叶面积和叶面积指数分别减少9.36 cm2和1.21,生育期延长了11.68 d;以抗旱指数和抗旱性综合评价值D的聚类结果为依据,筛选出成株期1级抗旱品种2份:陇糜2号、陇糜10号;经灰色关联度分析,旗叶面积、千粒重、单株有效穗数、小区产量均与抗旱指数、抗旱性综合评价值D的关联度较大,可作为成株期抗旱评价指标。

Evaluation and identification on the drought resistance of broomcorn millet bred cultivars at adult stage

In order to find out drought resistance of broomcorn millet cultivars under the different ecological environment, to excavate the drought of genetic resources, to provide drought resistance of materials, field direct identification method was used for drought resistance identification of 56 broomcorn millet cultivars at adult stage on the study in Dunhuang City, Gansu where annual rainfall is less than 40mm. By paired analysis, drought stress was no significant to nodes of main stem, panicles per plant, straw weight per plant, main panicle length, 1000-grain weight, specific leaf weight, on the contrary, plant height, spike weight per plant, grain weight per plant, yield per plot, Flag leaf area, leaf area index, period of duration reached a significant level. On the basis of system cluster result of drought resistance index and comprehensive evaluation value D, screened two cultivars named Longmi No.2, Longmi No.1o with better drought resistance; By gray correlation analysis, flag leaf area, 1000-grain weight, panicles per plant, yield per plot can be used as adult stage drought identification index.