Genotype and fungicide effects on late-season root growth of winter wheat
Genotype and fungicide effects on late-season root growth of winter wheat
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DOI：
10.1007/s11104-006-0028-x
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发表时间：
2006-06-01
期刊：
影响因子：
4.9
通讯作者：
Pepler, S.
中科院分区：
文献类型：
--
作者：
Ford, K. E.;Gregory, P. J.;Pepler, S.
本研究的目的是研究现代英国冬小麦品种花后根系生长和分布的基因型差异，以及杀菌剂应用的影响。对6个冬小麦品种花后根系生长进行了研究，无论是一个或三个应用程序的杀菌剂，在两个季节的田间试验进行了研究。根总质量在GS 63（开花期）和GS 85之间没有变化，但根长在一个季节内显著增加，从14.7增加到31.4 km m（2）。总体而言，没有证据表明在灌浆过程中根质量或长度下降。在GS 85，根质量占总植株质量的比例约为0.05。品种间根长和根质量差异显著，尤其是30 cm以下的根长和根质量差异显著。马六甲的根长最小，萨凡纳最大，三叶草在两个季节都有一个显着较大的根系低于40厘米。穗期施用杀菌剂对两个季节的根质量均无显著影响，但在病害多发季节可显著增加根长（P < 0.01）。通过维持绿色冠层更长时间，在旗叶出现时施用的杀真菌剂可能导致根系延迟衰老，并有助于开花后根质量和长度的维持。
The aim of this work was to investigate differences among genotypes in post-anthesis root growth and distribution of modern UK winter wheat cultivars, and the effects of fungicide applications. Post-anthesis root growth of up to six cultivars of winter wheat (Triticum aestivum L.), given either one or three applications of fungicide, was studied in field experiments during two seasons. Total root mass remained unchanged between GS63 (anthesis) and GS85, but root length increased significantly from 14.7 to 31.4 km m(2) in one season. Overall, there was no evidence for a decline in either root mass or length during grain filling. Root mass as a proportion of total plant mass was about 0.05 at GS85. There were significant differences among cultivars in root length and mass especially below 30 cm. Malacca had the smallest root length and Savannah the largest, and Shamrock had a significantly larger root system below 40 cm in both seasons. Fungicide applied at ear emergence had no significant effect on root mass in either season but increased root length (P < 0.01) in the more disease-prone season. By maintaining a green canopy for longer, fungicide applied at flag leaf emergence may have resulted in delayed senescence of the root system and contributed to the post-anthesis maintenance of root mass and length.