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Half-sib mating for inheritance analysis of post-drought recovery and productivity related traits in tall fescue
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-04-10 , DOI: 10.1002/agj2.20668
Fatemeh Pirnajmedin 1 , Mohammad Mahdi Majidi 2 , Mohammad Hadi Taleb 2 , Sayed Ali Mohammad Mirmohammady Maibody 2
Affiliation  

Climate change has exacerbated the need for grass varieties that are able to not only tolerate prolonged drought stress, but also to recover well post-drought. The genetic basis of post-drought recovery related traits and their association with drought tolerance has not yet been thoroughly investigated in tall fescue (Festuca arundinacea Schreb. syn. Lolium arundinaceum). Polycross-derived half-sib families (HF) were assessed for agro-morphological traits in the field under three irrigation levels (normal, mild drought, and intense drought stresses) during 2017 and 2018. In the 3rd year (2019), irrigation was withheld for all treatments for 2 mo; after 6 wk re-watering, the families were assessed for post-drought recovery. Considerable genetic variation was observed among HF for measured traits. The results show that increased intensity of water stress had adverse effects on post-drought recovery potential and production. Moderately high values of narrow-sense heritability for yield components and recovery related traits suggest the influence of additive gene action in the expression of these traits. Significant correlation of yield productivity and recovery forage yield with morphological traits and stress tolerance index indicate that forage production and recovery potential can be predicted via developing an index. The results also indicated that the recovery rate measured in the 3rd year was positively correlated with number of stems per plant and crown diameter of previous years. Based on the general combining ability (GCA) and application of multivariate analysis, families were identified that may be useful for high-yield production and post-drought recovery potential as well as turf application.

中文翻译:

高羊茅干旱后恢复和生产力相关性状遗传分析的半同胞交配

气候变化加剧了对不仅能够承受长期干旱压力而且能够在干旱后恢复良好的草种的需求。尚未在高羊茅(Festuca arundinacea Schreb. syn. Lolium arundinaceum )中彻底研究干旱后恢复相关性状的遗传基础及其与耐旱性的关联)。在 2017 年和 2018 年期间,在三个灌溉水平(正常、轻度干旱和严重干旱胁迫)下评估了多杂交衍生的半同胞家族(HF)的农业形态特征。在第三年(2019 年),灌溉是2 个月内不给所有治疗;重新浇水 6 周后,评估这些家庭的干旱后恢复情况。在测量性状的 HF 中观察到相当大的遗传变异。结果表明,水分胁迫强度的增加对干旱后恢复潜力和产量产生不利影响。产量成分和恢复相关性状的狭义遗传力的中等偏高值表明加性基因作用对这些性状表达的影响。产量生产力和恢复性牧草产量与形态性状和抗逆性指数的显着相关性表明,可以通过制定指数来预测牧草生产和恢复潜力。结果还表明,第3年测得的恢复率与前几年的单株茎数和冠径呈正相关。基于一般配合力 (GCA) 和多变量分析的应用,确定了可能对高产生产和干旱后恢复潜力以及草坪应用有用的家庭。结果还表明,第3年测得的恢复率与前几年的单株茎数和冠径呈正相关。基于一般配合力 (GCA) 和多变量分析的应用,确定了可能对高产生产和干旱后恢复潜力以及草坪应用有用的家庭。结果还表明,第3年测得的恢复率与前几年的单株茎数和冠径呈正相关。基于一般配合力 (GCA) 和多变量分析的应用,确定了可能对高产生产和干旱后恢复潜力以及草坪应用有用的家庭。
更新日期:2021-04-10
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