Utility of anthesis–silking interval information to predict grain yield under water and nitrogen limited conditions

[摘要] Delayed silking relative to pollen shed, measured as the anthesis–silking interval(ASI, the period between pollen shed and silking), is a good indicator of response toabiotic stresses in maize (Zea mays L.). This research was conducted to investigatehow ASI is affected by nitrogen (N) and water availability and to assess the utility ofASI to indirectly predict grain yield (GY) under contrasting water and N treatments.Two experiments were conducted in Hancock, WI, in 2018 and 2019. One experiment (Diverse hybrids) included 302 hybrids resulting from the cross of diverseinbred lines by a single tester evaluated at four different treatment levels resultingfrom combining nonlimited and low N with nonlimited and low water treatments.The second experiment (NSS FAC) included a set of 408 hybrids derived from thecross of biparental doubled-haploid lines from 13 factorial populations and evaluatedunder nonlimited and low N treatments. Anthesis and silk time in growing degreedays, and GY (Mg ha−1) were measured. Genomic prediction was assessed using agenomic best linear unbiased prediction model, and predictive ability was calculatedas the correlation between genomic predictions and adjusted means in the differenttreatments. Predictive ability ranged from .15 to .49 for NSS FAC and from .06 to.51 for Diverse hybrids across traits and treatments. The ASI was a good indicatorof stress and showed higher heritability than GY in the limited treatments for bothexperiments; however, it did not improve yield predictability.

[学科分类] 农业科学（综合）