20份饲草型燕麦品种的抗倒伏性研究

Study on lodging resistance of 20 forage oat(Avena sativa) varieties

摘要:

以20个饲草型燕麦品种为材料,在田间实际倒伏率及倒伏程度分级基础上探讨其茎秆形态特征、主要农艺性状的差异,用倒伏指数评价不同燕麦品种的田间抗倒伏能力。结果表明:供试的20个饲草燕麦品种在同一生态环境和栽培管理条件下,田间实际倒伏时期基本稳定在灌浆期至乳熟期,且倒伏程度分级年际间变化不大,不同饲草燕麦品种田间实际倒伏率幅度较大(0~96.7%),差异显著(P＜0.05)。不同饲草燕麦品种间株高、穗长、穗位高和主茎节数及茎秆基部第2节间形态特征均存在差异显著(P＜0.05),其中,第2节长度、茎粗和壁厚、重量、密度和充实度对饲草型燕麦品种抗倒伏能力影响较大。将20个饲草型燕麦品种依据倒伏指数和茎秆质量分别划分为抗倒伏型(优质)、中抗倒伏型(中间)、不抗倒伏型(劣质)3大类。

Abstract:

Totally 20 forage oat varieties were used to investigate morphological characteristics and main agronomic characters of the stems based on the actual lodging rate and the classification of lodging degree in field,and lodging index was used to evaluate the lodging resistance from 2017 to 2018 in Dingxi in order to provide reference for the breeding and cultivation.The results showed that under the same ecological environment and cultivation and management conditions,the actual lodging period was basically stable from grouting period to milk ripening period,and the annual change of lodging degree was not significant.The actual lodging rate of oat varieties showed a wide range (0~96.7%),and the difference was significant (P＜0.05).There were significant differences in plant height,spike length,spike height,number of main stem segments,and morphological characteristics of the second internode among varieties (P＜0.05),in which,the length of the second segment,stem thickness and wall thickness,weight,density and fullness had a great influence on lodging resistance.The tested varieties could be divided into 3 groups according to lodging index and stem quality,i.e.,lodging resistant type (high quality),moderate lodging resistant type (middle),and non-lodging resistant type (low quality).