Genotypic variation in nitrogen use efficiency trait in 35 cucumber inbred lines

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Ali Mirhosseyni, Moazzam Hassanpour Asil, Jamal-Ali Olfati, Mohammad Bagher Farhangi
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Abstract

Nitrogen is an essential nutrient for plant growth and yield, however excess nitrogen fertilizer application can lead to detrimental environmental impacts. Identifying cucumber genotypes with high nitrogen use efficiency (NUE) could facilitate sustainable crop production through optimized nitrogen management. This study was conducted in March 2021 at the research greenhouse of Department of Horticultural Sciences, University of Guilan, Iran. The objective of this study was to assess growth, yield components, nitrogen accumulation, NUE, and nitrate reductase activity in 60 cucumber genotypes under sufficient (NS) and deficient (ND) nitrogen conditions. Nitrogen deficiency caused reductions in growth and yield across all genotypes, although the severity varied. Nitrogen content was higher in all plant organs under NS compared to ND. NUE and its components nitrogen uptake efficiency (NUpE) and nitrogen utilization efficiency (NUtE) were significantly higher under ND versus NS. Line 57 exhibited the best NUE and yield under both NS and ND, and could be considered a nitrogen-efficient genotype. Based on NUE performance, lines were categorized as efficient, semi-efficient, low-efficient, and inefficient. Nitrate reductase activity was higher in leaves versus roots, and positively correlated with NUE, suggesting a relationship between enzyme activity and nitrogen uptake efficiency in roots. This study demonstrates genotype-specific responses to nitrogen availability in cucumber. The identification of genotypes efficient in NUE, such as line 57, can inform breeding efforts to improve nitrogen responsiveness. Characterizing nitrogen responsiveness across genotypes also allows for optimized, genotype-specific nitrogen management recommendations to be made, facilitating sustainable crop production.

Abstract Image

35 个黄瓜近交系氮利用效率性状的基因型变异
氮是植物生长和产量所必需的养分,但过量施用氮肥会对环境造成不利影响。确定氮利用效率(NUE)高的黄瓜基因型可通过优化氮管理促进作物的可持续生产。本研究于 2021 年 3 月在伊朗吉兰大学园艺科学系的研究温室进行。本研究的目的是评估 60 个黄瓜基因型在氮充足(NS)和氮缺乏(ND)条件下的生长、产量成分、氮积累、氮利用效率和硝酸还原酶活性。缺氮导致所有基因型的生长和产量下降,但严重程度各不相同。与缺氮相比,缺氮条件下所有植物器官中的氮含量都更高。在 ND 条件下,NUE 及其组成部分氮吸收效率(NUpE)和氮利用效率(NUtE)明显高于 NS 条件下。57 号品系在 NS 和 ND 条件下的氮利用效率和产量都最好,可视为氮效率高的基因型。根据氮利用效率的表现,品系被分为高效、半高效、低效和低效。叶片的硝酸还原酶活性高于根系,且与氮效率呈正相关,表明酶活性与根系的氮吸收效率之间存在关系。这项研究证明了黄瓜基因型对氮供应的特异性反应。确定氮吸收效率高的基因型(如品系 57)可为育种工作提供信息,以提高氮响应性。对不同基因型的氮响应特性进行鉴定,还可以提出优化的、针对特定基因型的氮管理建议,促进作物的可持续生产。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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