Effects of different water conditions on the biomass, root morphology and aerenchyma formation in bermudagrass (Cynodon dactylon (L.) Pers).
Effects of different water conditions on the biomass, root morphology and aerenchyma formation in bermudagrass (Cynodon dactylon (L.) Pers).
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DOI：
10.1186/s12870-022-03653-2
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发表时间：
2022-05-30
影响因子：
5.3
通讯作者：
Li, Changxiao
中科院分区：
文献类型：
--
作者：
Yuan, Zhongxun;Ni, Xilu;Chen, Chunhua;Zhang, Songlin;Chen, Xuemei;Yang, Zhihua;Li, Changxiao
狗牙根（Cynodon dactylon（L.）在不同淹水条件下，香梨根系的形态和解剖特征有不同的反应，在非淹水条件下，香梨根系发育通气组织。为了了解这些机制，狗牙根插条被用作实验材料，研究其生物量，根系形态，通气组织的形成在三个不同的水分处理，包括控制（CK），浅淹（SS），深淹（DS）。 狗牙根的总根长、根体积、根表面积和生物量均以CK最大，SS次之，DS最小。但DS和SS的平均根径均大于CK。对照根系通气组织形成，淹水促进了通气组织的形成和根腔率的增加。此外，我们的研究还发现，通气组织的形成过程始于细胞体积的增大和细胞分离形成一个狭窄的空间，这些细胞逐渐死亡形成成熟的通气组织腔，属于溶生型通气组织。同时，还观察到程序性细胞死亡的典型生物标志物。结果表明，淹水抑制了生物量的积累和根系的生长，但通过增加根系直径促进了通气组织的形成。
The bermudagrass (Cynodon dactylon (L.) Pers) roots responded differently in terms of morphological and anatomical characteristics under diverse submergence conditions, and they developed aerenchyma under non-flooding condition. In order to understand these mechanisms, bermudagrass cuttings were used as experimental material to examine their biomass, root morphology, and aerenchyma formation under three different water treatments, including control (CK), shallow submergence (SS), and deep submergence (DS). The total root length, root volume, root surface area, and biomass of bermudagrass were largest in CK, followed by SS and DS. However, the average root diameter was greater in each of DS and SS than that in CK. Root aerenchyma formation was observed in CK, and submergence boosted the aerenchyma formation and the root cavity rate. Furthermore, our study found that the process of aerenchyma formation began with the increase of cell volume and cell separation to form a narrow space, and these cells gradually died to form matured aerenchyma cavity, which belongs to schizo-lysigenous aerenchyma. Meanwhile, typical biomarkers of programmed cell death were also observed. Overall, these results suggested that submergence inhibited the accumulation of biomass and root growth, but facilitated aerenchyma formation by increasing root diameter.
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