Siti Noorrohmah, Siti Noorrohmah, H. Takahashi, M. Nakazono, M. Nakazono
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引用次数: 3
Abstract
A barrier to restrict radial oxygen loss (ROL) promotes the adaptation of plants to waterlogged soil conditions. A ROL barrier is formed in the basal parts of roots and contributes to the enhancement of the longitudinal diffusion of oxygen (O2) via aerenchyma toward the root tips. The adventitious roots of rice (Oryza sativa) can form a ROL barrier in waterlogged soil; however, whether a ROL barrier can be formed in the lateral roots (LRs) of rice remains unclear. Rice possesses two types of LRs: Land S-type. L-type LRs are generally long, thick, and capable of branching, whereas S-type LRs are short, thin, and incapable of branching. In this study, we examined whether the Land S-type LRs of rice possess the ability to form ROL barriers. In L-type LRs, a ROL barrier was formed; the aerenchyma, which is constitutively formed under aerated conditions, was further developed under stagnant deoxygenated conditions, suggesting that these traits promote the supply of O2 to the root tips of LRs. However, neither a ROL barrier, nor aerenchyma was formed in Stype LRs, and thus ROL was observed mostly in the basal parts. Patterns of deposition of suberin, which is thought to be one of the components of the ROL barrier, were consistent with the patterns of ROL-barrier formation in L-type and S-type LRs. These results suggest that Land S-type LRs play distinct roles in the growth of rice plants in waterlogged soils and in oxygenating the rhizosphere.
限制径向氧损失(ROL)的屏障促进了植物对涝渍土壤条件的适应。在根系基部形成ROL屏障,促进氧(O2)通过通气组织向根尖的纵向扩散。水稻(Oryza sativa)不定根可以在渍水土壤中形成ROL屏障;然而,水稻侧根是否能形成ROL屏障尚不清楚。水稻有两种LRs: Land s型。l型LRs通常又长又厚,能够分支,而s型LRs则又短又薄,不能分支。在本研究中,我们考察了水稻的Land s型LRs是否具有形成ROL屏障的能力。l型LRs形成ROL屏障;通气条件下本构形成的通气组织在缺氧停滞条件下进一步发育,说明这些性状促进了LRs根尖的氧供应。然而,在型LRs中,既没有形成ROL屏障,也没有形成通气组织,因此ROL主要发生在基部。被认为是ROL屏障成分之一的亚木素的沉积模式与l型和s型lr中ROL屏障的形成模式一致。这些结果表明,陆地s型LRs对水稻在涝渍土壤中的生长和根际氧合具有明显的作用。
期刊介绍:
Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.