Compensatory growth of lateral roots responding to excision of seminal root tip in rice
Compensatory growth of lateral roots responding to excision of seminal root tip in rice
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DOI：
10.3117/plantroot.11.48
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发表时间：
2017-01-01
期刊：
影响因子：
0.6
通讯作者：
Inukai, Yoshiaki
中科院分区：
文献类型：
--
作者：
Kawai, Tsubasa;Nosaka-Takahashi, Misuzu;Inukai, Yoshiaki
当亲本根伸长受到抑制时，促进侧根的发育。促进LR生长补偿亲本根的生长，从而有助于维持总根长。然而，LRs补偿性增长背后的发展过程仍然不清楚。在这项研究中，我们通过手术切除亲本(种子)根尖来诱导水稻的LR代偿生长，并分析了LRs的形态和解剖学变化。我们的分析表明，精液根尖切除通过增加底层组织层数和中柱直径增加了一级LRs的直径，并促进了伸长，在其余的近端出现了更高级别的LRs。我们还发现，在早期发育阶段，LR原基直径明显增大，然后明显地产生更高阶的LRs，以响应精根切断。此外，LR形态的变化程度因离切割部位的距离不同而不同，距离切割部位越远，形态的变化越弱。综上所述，亲本根尖切除引起的LRs的形态和解剖学变化是连续变化的，并与断根部位LR原基的发育阶段和离断根部位的距离有关。
Development of lateral roots (LRs) is promoted when parental root elongation is suppressed. Promotion of LR growth compensates for parental root growth, which contributes to the maintenance of total root length. However, the developmental processes underlying the compensatory growth of LRs are still unclear. In this study, we induced LR compensatory growth in rice by surgical excision of a parent (seminal) root tip, and analyzed the morphological and anatomical changes in LRs. Our analysis revealed that seminal root-tip excision increased the diameter of first-order LRs by increasing in the number of ground-tissue layers and the stele diameter and also promoted elongation, with higher order LRs emerging in the remaining proximal portions. We also found that LR primordia in early developmental stages increased in diameter markedly and then produced higher order LRs pronouncedly in response to seminal-root cutting. Furthermore, the degree of change in LR morphology differed depending on the distance from the cut site, with changes in morphologies weakening further from the cut site. Taken together, the morphological and anatomical changes of LRs that are induced by the root-tip excision of the parent vary continuously, and are dependent on both the developmental stage of LR primordia at the site of root-cutting and the distance from the cut site.