Ethephon Improved Stalk Strength of Maize (Zea Mays L.) Mainly through Altering Internode Morphological Traits to Modulate Mechanical Properties under Field Conditions
| Autor: | Zhaohu Li, Yushi Zhang, Yubin Wang, Wei Wang, Delian Ye, Liusheng Duan, Xinming Qiu, Mingcai Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
stalk strength mechanical properties 01 natural sciences lcsh:Agriculture chemistry.chemical_compound Mechanical strength Dry matter ethephon internode chemical traits internode morphological traits Chemistry lcsh:S 04 agricultural and veterinary sciences Zea mays Horticulture Stalk 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Grain yield structural dry matter Agronomy and Crop Science 010606 plant biology & botany Ethephon Field conditions maize (Zea mays L.) |
| Zdroj: | Agronomy, Vol 9, Iss 4, p 186 (2019) Agronomy Volume 9 Issue 4 |
| ISSN: | 2073-4395 |
| Popis: | Stalk strength is critical for reducing maize stalk lodging and maintaining grain yield. Ethephon has been widely applied to molding compact plant-type to reduce the lodging risk in maize production. However, there is little information on how ethephon regulates internode mechanical properties to improve maize stalk strength. Multiyear field experiments (2013&ndash 2017) were conducted to determine the effects of foliar-applied ethephon on summer maize internode morphological, chemical and mechanical characteristics. The hypothetical structural equation model was used to analyze the contribution of ethephon-induced changes of internode morphological and chemical traits to stalk mechanical strength. Ethephon significantly reduced the basal internode length, while increasing internode diameters and breaking resistance. Meanwhile, ethephon significantly increased the ratio of structural dry matter to total dry matter and the amount of structural dry matter per unit length and volume. Mechanical assays suggested that ethephon significantly altered geometric properties and increased the maximum bending moment, maximum failure force, while depressing the material properties. Furthermore, correlation and path analyses revealed strong correlations and significant contribution of internode morphological properties to stalk mechanical strength, respectively. These results support the conclusion that ethephon-induced morphology alteration played a major role in improving maize internode strength. |
| Databáze: | OpenAIRE |
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