Piñero M C, Porras Manuel E, López-Marín Josefa, Sánchez-Guerrero Mari C, Medrano Evangelina, Lorenzo Pilar, Del Amor Francisco M
Department of Crop Production and Agri-Tecnology, Murcia Institute of Agri-Food Research and Development, Murcia, Spain.
Agricultural Research and Development Centre of Almería (IFAPA), Almería, Spain.
Front Plant Sci. 2019 Apr 2;10:301. doi: 10.3389/fpls.2019.00301. eCollection 2019.
The horticultural industry demands high-quality resources to achieve excellence in yield and optimal revenues. Nitrogen is a pivotal nutrient to accomplish these goals for plant growth and product quality. However, competition for water in semi-arid regions can force the use of brackish waters, which can impair N uptake. The lower N uptake can be due to several reasons, such as an antagonism between ions, an absence of ATP, and/or alteration of N metabolism. The effect of supplying N as alone or in combination with , coupled with low or high salinity (8 or 20 mM NaCl), has been studied in sweet pepper fruits ( L. cv. Melchor). The application of at high salinity affected chromatic parameters (a, b, and C), while chlorophyll a and b levels declined and β-carotene increased. The concentrations of P, K, Ca, Mg, and Cu were reduced in the fruits of plants irrigated with . The concentration of Na was only reduced when was supplied. Likewise, the concentration of total phenolics was also reduced at high salinity. However, total protein was unaffected. The amino acid profile was altered by the supply of , which reduced the concentrations of histidine and phenylalanine. Moreover, the concentrations of putrescine and cadaverine were increased by at high salinity, whereas that of cadaverine was reduced by at low salinity. The observed changes in fruit quality triggered by salinity, under the conditions of this study, should be borne in mind for this crop with regard to the envisaged palliative effect of the supply of N- .
园艺产业需要高质量的资源来实现产量卓越和收益优化。氮是实现植物生长和产品质量这些目标的关键养分。然而，半干旱地区对水的竞争可能迫使使用微咸水，这会损害氮的吸收。氮吸收降低可能有多种原因，例如离子间的拮抗作用、ATP的缺乏和/或氮代谢的改变。已经在甜椒果实（L. cv. Melchor）中研究了单独供应氮或与 结合供应氮，再加上低盐度或高盐度（8或20 mM NaCl）的影响。在高盐度下施用 会影响色度参数（a、b和C），而叶绿素a和b水平下降，β - 胡萝卜素增加。用 灌溉的植物果实中P、K、Ca、Mg和Cu的浓度降低。只有在供应 时Na的浓度才会降低。同样，在高盐度下总酚类物质的浓度也会降低。然而，总蛋白不受影响。氨基酸谱因 的供应而改变，这降低了组氨酸和苯丙氨酸的浓度。此外，在高盐度下 会增加腐胺和尸胺的浓度，而在低盐度下 会降低尸胺的浓度。在本研究条件下，对于这种作物，考虑到供应氮 - 所设想的缓解作用时，应牢记盐度引发的果实品质变化。
