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Multi environmental evaluation of persistence and drought tolerance in smooth bromegrass (Bromus inermis): genetic analysis for stability in combining ability
Crop & Pasture Science ( IF 1.9 ) Pub Date : 2021-07-22 , DOI: 10.1071/cp21018
F. Saeidnia , M. M. Majidi , M. R. Dehghani , A. Mirlohi , B. Araghi

Information on the nature and amount of genotype × environment (GE) interaction for economic traits and persistence is extremely rare in smooth bromegrass (Bromus inermis Leyss.), especially under drought stress. In this study, 25 half-sib (HS) families of smooth bromegrass were evaluated in the field during five consecutive years under normal and water deficit conditions. The effect of water deficit on dry forage yield was increased from the first year to the fifth, and manifested as a decline in persistence of HS families. Based on narrow-sense heritability estimates, additive gene action was found to be an effective factor in the control of yield components, whereas forage yield is controlled by both additive and non-additive gene actions. Considering the three parameters of stability of combining ability, mean performance and drought tolerance simultaneously, it was inferred that four parental genotypes were superior and stable with high values of general combining ability. This indicates that when developing synthetic varieties from these genotypes, both stability and plant productivity are transmitted to their progenies.



中文翻译:

雀麦(Bromus inermis) 持久性和耐旱性的多环境评价:配合力稳定性的遗传分析

关于经济性状和持久性的基因型×环境(GE)相互作用的性质和数量的信息在光面雀Bromus inermis )中极为罕见Leyss。),尤其是在干旱胁迫下。在这项研究中,在正常和缺水条件下连续五年在田间评估了 25 个半同胞 (HS) 凤梨科植物。水分亏缺对干牧草产量的影响从第1年到第5年增加,表现为HS科的持久性下降。根据狭义遗传力估计,加性基因作用被发现是控制产量成分的有效因素,而牧草产量受加性和非加性基因作用控制。同时考虑配合力稳定性、平均性能和耐旱性三个参数,推断4个亲本基因型优良且稳定,具有较高的一般配合力值。

更新日期:2021-07-25
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