A Larger Root System Is Coupled With Contrasting Expression Patterns of Phosphate and Nitrate Transporters in Foxtail Millet [Setaria italica (L.) Beauv.] Under Phosphate Limitation.
A Larger Root System Is Coupled With Contrasting Expression Patterns of Phosphate and Nitrate Transporters in Foxtail Millet [Setaria italica (L.) Beauv.] Under Phosphate Limitation.
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磷酸盐限制下，谷子 [Setaria italica (L.) Beauv.] 中较大的根系与磷酸盐和硝酸盐转运蛋白的对比表达模式相结合
DOI：
10.3389/fpls.2018.01367
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发表时间：
2018
影响因子：
5.6
通讯作者：
Li X
中科院分区：
文献类型：
--
作者：
Ahmad Z;Nadeem F;Wang R;Diao X;Han Y;Wang X;Li X
谷子[Setaria italica（L.）Beauv.]，广泛种植的粮食和饲料作物，发展出较小的根系，但在氮限制下扩大根直径，促进养分运输。谷子如何应对磷酸盐限制（LP）仍然没有解决。测序品种豫谷1号的LP幼苗地上部和根系中的P浓度均显著降低，叶片中的花青素积累水平较高，表明其在水培条件下受到了P限制。LP植物的一个明显的适应表型是较大的根系，主要是由于刺激侧根增殖的结果，在数量，密度和长度方面。LP下根系生物量的优先积累确保了根系扩展的碳供应，并导致总根长和比根长的显着增加，这大大扩展了生长介质中P的吸收表面。生长素和赤霉素浓度的升高可能作为一个内部的助推器支撑根结构下LP重新图案。不仅是形态上的适应，根中SiPHT 1;1和SiPHT 1;4的表达上调以及根和地上部中SiPHT 1;2的表达上调预处理LP下适应性增强的P吸收和转运。有趣的是，内部氮盈余发生的LP芽和根中的游离氨基酸和更高浓度的氮在根中的显着增加所示。这样的氮过剩“信号”倾向于下调硝酸盐转运蛋白SiNRT2.1和SiNAR2.1在根中的表达以及SiNRT1.11和SiNRT1.12在地上部中的表达，以减少硝酸盐向地上部或地上部内的移动。总之，我们的工作为关键谷类作物对LP的适应及其与氮营养的内在联系提供了新的见解。
Foxtail millet [Setaria italica (L.) Beauv.], a widely cultivated food and fodder crop, develops a smaller root system while enlarges the root diameter facilitating nutrient transport under nitrogen limitation. How foxtail millet responds to phosphate limitation (LP) remains unaddressed. LP seedlings of the sequenced variety Yugu1 had significantly lower P concentrations in both shoots and roots and displayed higher levels of anthocyanin accumulation in leaves, indicating that the seedlings suffered from P limitation under hydroponic culture. One obvious and adaptive phenotype of LP plants was the larger root system mostly as the result of stimulation of lateral root proliferation in terms of the number, density, and length. Preferential biomass accumulation in the root under LP ensured carbon provision for root expansion and resulted in significant increases in the total and specific root length, which substantially extended the absorptive surface of P in the growth medium. Elevation of auxin and gibberellin concentrations might serve as an internal boost underpinning root architectural re-patterning under LP. Not just morphological adaptation, up-regulation of expression of SiPHT1;1 and SiPHT1;4 in roots and that of SiPHT1;2 in roots and shoots preconditioned adaptive enhancement of P uptake and translocation under LP. Interestingly, internal nitrogen surpluses occurred as indicated by dramatic increases in free amino acids in LP shoots and roots and higher concentrations of nitrogen in roots. Such nitrogen surplus ‘signals’ tended to switch down expression of nitrate transporters SiNRT2.1 and SiNAR2.1 in the root and that of SiNRT1.11 and SiNRT1.12 in the shoot to reduce nitrate mobilization toward or within the shoot. Together, our work provided new insights into adaption of a critical cereal crop to LP and its innate connection with nitrogen nutrition.
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影响因子：
46.9
作者：
Bennetzen, Jeffrey L.;Schmutz, Jeremy;Devos, Katrien M.
通讯作者：
Devos, Katrien M.
DOI：
10.1051/forest:19960401
发表时间：
1996-01-01
期刊：
ANNALES DES SCIENCES FORESTIERES
影响因子：
--
作者：
BenBrahim, M;Loustau, D;Saur, E
通讯作者：
Saur, E
影响因子：
6.9
作者：
Hammond, John P.;Broadley, Martin R.;Greenwood, Duncan J.
通讯作者：
Greenwood, Duncan J.
影响因子：
7.4
作者：
Hsu, Po-Kai;Tsay, Yi-Fang
通讯作者：
Tsay, Yi-Fang
影响因子：
3.6
作者：
Daverdin, Guillaume;Bahri, Bochra A.;Devos, Katrien M.
通讯作者：
Devos, Katrien M.