Root hairs are the most important root trait for rhizosheath formation of barley (Hordeum vulgare), maize (Zea mays) and Lotus japonicus (Gifu).
Root hairs are the most important root trait for rhizosheath formation of barley (Hordeum vulgare), maize (Zea mays) and Lotus japonicus (Gifu).
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DOI：
10.1093/aob/mcab029
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发表时间：
2021-07-28
期刊：
影响因子：
4.2
通讯作者：
Dodd IC
中科院分区：
文献类型：
--
作者：
Burak E;Quinton JN;Dodd IC
根鞘被定义为根系从地面拔出后粘附在根系上的土壤。根毛和粘液（根分泌物）是参与根鞘形成的关键根性状，但为了更好地理解所涉及的机制，应区分它们的相对贡献。将三个物种 [大麦 (Hordeum vulgare)、玉米 (Zea mays) 和 Lotus japonicus (Gifu)] 在沙壤土中形成根鞘的能力与其根无毛突变体 [秃根大麦 (brb)、玉米根无毛 3 (rth3) 和根无毛 1 (Ljrhl1)] 进行比较。比较野生型（WT）大麦和玉米的根毛性状（长度和密度）以及大麦和玉米基因型的渗出物粘附性。此外，还比较了谷类物种内不同根类型（轴根与侧根）的根毛特征和渗出物粘附性。在WT植物中，每单位根长度，根鞘尺寸减小的顺序为大麦>日本益母草>玉米。根毛显着增加了所有物种的根鞘形成（大麦、日本 L. japonicus 和玉米分别为 3.9、3.2 和 1.8 倍），但对谷物中渗出物粘附性没有一致的基因型影响。虽然与各自的野生型相比，brb 渗出物较多，而 rth3 渗出物的粘附性较低，但玉米 rth3 比大麦 brb 结合更多的土壤。尽管两种玉米基因型都比大麦基因型产生显着更多的粘性渗出物，但WT大麦的根毛发育比WT玉米更广泛。因此，与野生型玉米相比，野生型大麦中较长根毛的密度更大，结合的土壤更多。根类型似乎并不影响根鞘的形成，除非这些类型的根长度不同。当存在根毛时，更大的根毛发育比根分泌物粘附更能促进根鞘形成。然而，当根毛不存在时，根分泌物的粘附性是更显着的特征。
Rhizosheaths are defined as the soil adhering to the root system after it is extracted from the ground. Root hairs and mucilage (root exudates) are key root traits involved in rhizosheath formation, but to better understand the mechanisms involved their relative contributions should be distinguished. The ability of three species [barley (Hordeum vulgare), maize (Zea mays) and Lotus japonicus (Gifu)] to form a rhizosheath in a sandy loam soil was compared with that of their root-hairless mutants [bald root barley (brb), maize root hairless 3 (rth3) and root hairless 1 (Ljrhl1)]. Root hair traits (length and density) of wild-type (WT) barley and maize were compared along with exudate adhesiveness of both barley and maize genotypes. Furthermore, root hair traits and exudate adhesiveness from different root types (axile versus lateral) were compared within the cereal species. Per unit root length, rhizosheath size diminished in the order of barley > L. japonicus > maize in WT plants. Root hairs significantly increased rhizosheath formation of all species (3.9-, 3.2- and 1.8-fold for barley, L. japonicus and maize, respectively) but there was no consistent genotypic effect on exudate adhesiveness in the cereals. While brb exudates were more and rth3 exudates were less adhesive than their respective WTs, maize rth3 bound more soil than barley brb. Although both maize genotypes produced significantly more adhesive exudate than the barley genotypes, root hair development of WT barley was more extensive than that of WT maize. Thus, the greater density of longer root hairs in WT barley bound more soil than WT maize. Root type did not seem to affect rhizosheath formation, unless these types differed in root length. When root hairs were present, greater root hair development better facilitated rhizosheath formation than root exudate adhesiveness. However, when root hairs were absent root exudate adhesiveness was a more dominant trait.
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DOI：
10.1111/nph.14897
发表时间：
2018-03
期刊：
The New phytologist
影响因子：
--
作者：
Galloway AF;Pedersen MJ;Merry B;Marcus SE;Blacker J;Benning LG;Field KJ;Knox JP
通讯作者：
Knox JP
影响因子：
4.9
作者：
Carminati, Andrea;Moradi, Ahmad B.;Oswald, Sascha E.
通讯作者：
Oswald, Sascha E.
影响因子：
4.2
作者：
Czarnes, S;Hallett, PD;Young, IM
通讯作者：
Young, IM
影响因子：
4.9
作者：
Czarnes, S;Dexter, AR;Bartoli, F
通讯作者：
Bartoli, F
影响因子：
9.4
作者：
FOSTER, RC
通讯作者：
FOSTER, RC