Genotype-by-environment interaction analysis of rice (Oryza spp.) yield in a floodplain ecosystem in West Africa
Genotype-by-environment interaction analysis of rice (Oryza spp.) yield in a floodplain ecosystem in West Africa
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DOI：
10.1016/j.eja.2015.11.014
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发表时间：
2016-02-01
影响因子：
5.2
通讯作者：
Sakagami, Jun-Ichi
中科院分区：
文献类型：
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作者：
Katsura, Keisuke;Tsujimoto, Yasuhiro;Sakagami, Jun-Ichi
西非有大面积的河漫滩，其中大部分目前没有用于农田。水稻（Oryza spp.）由于其对广泛的水环境具有高度的适应性，是一种很有前途的洪泛区农业作物。另一方面，即使在洪泛区的一个小区域内，土壤肥力和水的可用性也有很大的差异。因此，我们评估了27个水稻基因型在四个领域在加纳的北方地区的洪泛平原三年调查基因型×环境（G × E）的相互作用，水稻产量和确定稳定，高产的基因型。这些基因型包括一个sativa、O. glaberrima和非洲新稻（NERICA），其中许多是因为据报道它们的耐淹性而被选中的，因为预计在洪泛区会受到淹浸损害。产量的变异范围为0.14 ~ 5.35t/ha（-1），主要受滩区地理位置、基因型和年份的影响，且存在显著的基因型、环境和G × E互作效应，分别占总变异的24.8%、20.2%和28.2%。结果表明，选择土壤肥力高、淹水风险低的适宜地点是实现滩地高产的必要条件。此外，早播将是有效的高产作物管理，可减少刚播种后遭受水淹损害的风险，并确保有足够的生长期以实现高产。IR 42基因型在各环境中平均产量最高，但产量稳定性较差。另一方面，包括Amankwatia（一种适应灌溉和低地环境的当地芳香品种）和IRBL 9-W[RL]（一种含有Sub1耐淹基因的抗稻瘟病品种）在内的几种基因型表现出高产、稳产。为了将这些结果在西非其他洪泛区实际应用，应进一步研究导致G × E互作对水稻产量的生理机制。(C)2015 Elsevier B. V.版权所有。
West Africa has large areas of river floodplains, most of which are not currently used for farmland. Rice (Oryza spp.) is a promising crop for farming in floodplains because of its high adaptability to a wide range of water environments. On the other hand, there is great variation in soil fertility and water availability even in a small area within a floodplain. Hence, we evaluated 27 rice genotypes in four fields in three years in a floodplain of the Northern Region of Ghana to investigate genotype x environment (G x E) interactions for rice yield and to identify stable, high-yielding genotypes. The genotypes consisted of a sativa, O. glaberrima and New Rice for Africa (NERICA), and many were selected for their reported submergence resistance because of the anticipated submergence damage in the floodplain. There were large variations in yield, which ranged from 0.14 to 5.35 t ha(-1) depending on the location within a floodplain, genotype and year, and there were significant genotype, environment and G x E interaction effects on yield, accounting for 24.8%, 20.2%, and 28.2%, respectively, of the total variation. The results suggested that selection of suitable location with high soil fertility and low risk of submergence is necessary to achieve high yield in a floodplain. In addition, early sowing would be effective high-yielding crop management, which reduced the risk of submergence-induced damage just after sowing and secured sufficient growth duration to achieve high yield. Genotype IR42 showed the highest average yield among environments, but its yield stability was low. On the other hand, several genotypes including Amankwatia, a local aromatic cultivar adapted to irrigated and lowland environments, and IRBL9-W[RL], a blast-tolerant variety containing the Sub1 gene for submergence tolerance, showed high, stable yield. To put these results to practical use in other floodplain areas in West Africa, physiological mechanisms causing G x E interaction for rice yield should be further studied. (C) 2015 Elsevier B.V. All rights reserved.