期刊
FUNCTIONAL PLANT BIOLOGY
卷 48, 期 4, 页码 411-421出版社
CSIRO PUBLISHING
DOI: 10.1071/FP20200
关键词
abiotic stress; lignin; radial oxygen loss; root anatomy; root angle; root internal aeration; root length modelling; root respiration; suberin; tropical grasses; Urochloa spp; waterlogging
资金
- COLCIENCIAS (Colombian government)
- University of Western Australia
- Australian Society of Plant Scientists
- R.N. Robertson Travelling Fellowship
This study identified root traits related to waterlogging tolerance in C4 perennial Urochloa grasses, including increased aerenchyma formation, steeper root angles and greater root lengths in tolerant genotypes. Tolerant genotypes showed deeper roots, steeper root angle, larger root biomass, and greater shoot biomass under stagnant conditions. Total root length had the strongest positive influence on shoot dry mass, suggesting it can be used as a proxy for selecting waterlogging tolerant Urochloa genotypes.
C4 perennial Urochloa spp. grasses are widely planted in extensive areas in the tropics. These areas are continuously facing waterlogging events, which limits plant growth and production. However, no commercial cultivar combining excellent waterlogging tolerance with superior biomass production and nutritional quality is available. The objective of this study was to identify root traits that can be used for selecting waterlogging tolerant species of Urochloa. Root respiration, root morphological, architectural and anatomical traits were evaluated in eight contrasting Urochloa spp. genotypes grown under aerated or deoxygenated stagnant solutions. Moreover, modelling of internal aeration was used to relate differences in root traits and root growth in waterlogged soils. Increased aerenchyma formation in roots, reduced stele area and development of a fully suberised exodermis are characteristics improving internal aeration of roots and therefore determining waterlogging tolerance in these C4 forage grasses. Waterlogging-tolerant genotypes had steeper root angles and greater root lengths than the waterlogging-sensitive genotypes. In stagnant conditions, waterlogging-tolerant genotypes had a greater proportion of aerenchyma and reduced stele area in root cross-sections, had deeper roots, steeper root angle and larger root biomass, which in turn, allowed for greater shoot biomass. Total root length had the strongest positive influence on shoot dry mass and can therefore be used as proxy for selecting waterlogging tolerant Urochloa genotypes.
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