气候变化领域集成服务门户(CCPortal): Genetic Gains of Grain Yield among the Maize Cultivars Released over a Century from the National Breeding Program of Zimbabwe

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DOI	10.3390/agronomy14020246
	Genetic Gains of Grain Yield among the Maize Cultivars Released over a Century from the National Breeding Program of Zimbabwe
	Mazibuko, Purity; Mutengwa, Charles; Magorokosho, Cosmos; Kutywayo, Dumisani; Kamutando, Casper Nyaradzai
发表日期	2024
EISSN	2073-4395
起始页码	14
结束页码	2
卷号	14 期号:2
英文摘要	Monitoring genetic gain is required in crop improvement programs in order to assess the effectiveness of breeding initiatives. The periodic measurement of genetic gain will quantify the efficiency of new technologies incorporated into the program. Here, a total of 24 cultivars (20 released from Zimbabwe's National Breeding program (ZNBP) plus 4 released by the largest and oldest private seed company in Zimbabwe, Seed Co) over the period of 1900-2016, were evaluated across 10 locations in Zimbabwe. The testing locations represented agro-ecologies where maize is optimally grown and where maize production is under threat from climate change-induced abiotic stresses, particularly drought and heat stress, in Zimbabwe. The 24 cultivars were laid out across all the locations using the alpha (0.1) lattice design replicated two times with six incomplete blocks nested in each of the replicates. The genetic gains were estimated at 61 kg ha-1 yr-1, 25 kg ha-1 yr-1, 6 kg ha-1 yr-1, and 2 kg ha-1 yr-1 under optimal, random drought stress, heat stress, and managed drought stress conditions, respectively. The results were comparable with those from other studies where newly released cultivars yielded more than old cultivars. Overall, the results demonstrated that over a century, the ZNBP has been making significant progress in yield increments in its maize genotypes.
英文关键词	drought stress; heat stress; genetic gains; yield gains; maize breeding
语种	英语
WOS研究方向	Agriculture ; Plant Sciences
WOS类目	Agronomy ; Plant Sciences
WOS记录号	WOS:001168250400001
来源期刊	AGRONOMY-BASEL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297553
作者单位	University of Fort Hare; University of Zimbabwe
推荐引用方式 GB/T 7714	Mazibuko, Purity,Mutengwa, Charles,Magorokosho, Cosmos,et al. Genetic Gains of Grain Yield among the Maize Cultivars Released over a Century from the National Breeding Program of Zimbabwe[J],2024,14(2).
APA	Mazibuko, Purity,Mutengwa, Charles,Magorokosho, Cosmos,Kutywayo, Dumisani,&Kamutando, Casper Nyaradzai.(2024).Genetic Gains of Grain Yield among the Maize Cultivars Released over a Century from the National Breeding Program of Zimbabwe.AGRONOMY-BASEL,14(2).
MLA	Mazibuko, Purity,et al."Genetic Gains of Grain Yield among the Maize Cultivars Released over a Century from the National Breeding Program of Zimbabwe".AGRONOMY-BASEL 14.2(2024).