小麦对赤霉病抗性鉴定指标的探讨

连续3年用单花注滴法接种,考察了穗轴发病时间、病小穗数和穗轴病节片数3个抗性指标。结果表明,病小穗数这一指标能较明确地划分出高抗、中抗、感病3种类型,且稳定性最好。以病小穗数作为主要的抗病性鉴定指标,再参考穗轴病节片数,对小麦品种抗病性的评价及育种材料抗病性的鉴定较为准确、实用。

RESEARCH ON CRITERIA OF RESISTANCE TO WHEAT SCAB (GIBBERELLA ZEAE)

Using the inoculation method of injecting wheat scab spores into a single floret in the middle of a wheat spike for three years in succession, three resistance criteria (the period from inoculation to the disease spreading to the rachis, the number of diseased spikelets, the number of diseased internodes on the rachis) were studied. The results indicated that high resistance, medium resistance and Susceptibility could be more clearly differentiated by the number of diseased spikelets, which proved to be the most consistent criterion. We could make a more accurate evaluation of the varietal resistance relying mainly on the number of diseased spikelets while taking the number of diseased internodes on the rachis as an auxiliary index.