Avoiding lodging in irrigated spring wheat. II. Genetic variation of stem and root structural properties
Avoiding lodging in irrigated spring wheat. II. Genetic variation of stem and root structural properties
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DOI：
10.1016/j.fcr.2016.06.007
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发表时间：
2016-09
影响因子：
5.8
通讯作者：
F. Piñera-Chávez;P. Berry;M. J. Foulkes;G. Molero;M. Reynolds
中科院分区：
文献类型：
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作者：
F. Piñera-Chávez;P. Berry;M. J. Foulkes;G. Molero;M. Reynolds
在2010-2013年的三个季节里，通过CIMMYT核心春小麦种质资源小组（CIMCOG）对墨西哥西北部Yaqui山谷的倒伏相关性状进行了评价。在跨年分析中，所有倒伏相关性状的遗传变异均显著，但由于等级变化或品种间绝对差异的变化，发现了显著的G × E互作。不同季节品种表现的不一致性尤其降低了抗倒伏关键性状（锚固强度）的遗传力。茎秆抗倒伏相关目标性状（茎秆强度）的遗传力值在0.70以上。茎强与茎粗呈正相关，根板铺展与根强呈正相关。选择较大的茎粗和壁宽、较大的根板铺展和较短的株高可以分别通过提高茎强、根强和降低植株杠杆来提高抗倒伏能力。实现抗倒伏作物将取决于寻找更广泛的根板分布和实施新的管理策略。倒伏性状之间的遗传联系不会限制关键倒伏性状维度的组合，以实现一个防倒伏的理想型。然而，茎秆强度和茎壁宽度之间的强烈相关性会增加抗倒伏所需的总生物量成本。
Lodging-related traits were evaluated on the CIMMYT Core spring wheat Germplasm Panel (CIMCOG) in the Yaqui Valley of North-West Mexico during three seasons (2010–2013). Genetic variation was significant for all the lodging-related traits in the cross-year analysis, however, significant G × E interaction due to rank changes or changes in the absolute differences between cultivars were identified. The inconsistences on cultivar performances across seasons particularly reduced the heritability of key characters related to root lodging resistance (anchorage strength). Target characters related to stem lodging resistance (stem strength) showed good heritability values equal or above 0.70. Positive correlations between stem strength and stem diameter and between root plate spread and root strength were found. Selecting for greater stem diameter and wall width, greater root plate spread and shorter plant height could enable breeders to increase lodging resistance by increasing stem strength, root strength and decreasing plant leverage, respectively. Achieving a lodging-proof crop will depend on finding a wider root plate spread and implementing new management strategies. Genetic linkages between lodging traits will not constrain the combination of the key lodging-trait dimensions to achieve a lodging-proof ideotype. However, strong association between stem strength and stem wall width will increase the total biomass cost needed for lodging resistance.