174:
91:. Nitrate is taken up by several nitrate transporters that use a proton gradient to power the transport. Nitrogen is transported from the root to the shoot via the xylem in the form of nitrate, dissolved ammonia and amino acids. Usually (but not always) most of the nitrate reduction is carried out in the shoots while the roots reduce only a small fraction of the absorbed nitrate to ammonia. Ammonia (both absorbed and synthesized) is incorporated into amino acids via the
99:(GS-GOGAT) pathway. While nearly all the ammonia in the root is usually incorporated into amino acids at the root itself, plants may transport significant amounts of ammonium ions in the xylem to be fixed in the shoots. This may help avoid the transport of organic compounds down to the roots just to carry the nitrogen back as amino acids.
80:. Plant roots themselves can affect the abundance of various forms of nitrogen by changing the pH and secreting organic compounds or oxygen. This influences microbial activities like the inter-conversion of various nitrogen species, the release of ammonia from organic matter in the soil and the fixation of nitrogen by
210:
Plants that reduce nitrates in the shoots and excrete alkali from their roots need to transport the alkali in an inert form from the shoots to the roots. To achieve this they synthesize malic acid in the leaves from neutral precursors like carbohydrates. The potassium ions brought to the leaves along
177:
Different plants use different pathways to different levels. Tomatoes take in a lot of K and accumulate salts in their vacuoles, castor reduces nitrate in the roots to a large extent and excretes the resulting alkali. Soy bean plants moves a large amount of malate to the roots where they convert it
182:
Every nitrate ion reduced to ammonia produces one OH ion. To maintain a pH balance, the plant must either excrete it into the surrounding medium or neutralize it with organic acids. This results in the medium around the plants roots becoming alkaline when they take up nitrate.
218:
Plants like castor reduce a lot of nitrate in the root itself, and excrete the resulting base. Some of the base produced in the shoots is transported to the roots as salts of organic acids while a small amount of the carboxylates are just stored in the shoot itself.
190:
taken into the root must be accompanied by either the uptake of a cation or the excretion of an anion. Plants like tomatoes take up metal ions like K, Na, Ca and Mg to exactly match every nitrate taken up and store these as the salts of organic acids like
211:
with the nitrate in the xylem are then sent along with the malate to the roots via the phloem. In the roots, the malate is consumed. When malate is converted back to malic acid prior to use, an OH is released and excreted. (RCOO + H
657:
Kiyomiya, S.; Nakanishi, H.; Uchida, H.; Tsuji, A.; Nishiyama, S.; Futatsubashi, M.; Tsukada, H.; Ishioka, N. S.; Watanabe, S.; Ito, T.; Mizuniwa, C.; Osa, A.; Matsuhashi, S.; Hashimoto, S.; Sekine, T.; Mori, S. (2001).
230:(NUE) is the proportion of nitrogen present that a plant absorbs and uses. Improving nitrogen use efficiency and thus fertilizer efficiency is important to make agriculture more sustainable, by reducing pollution (
1143:
Sharma, Narendra; Sinha, Vimlendu
Bhushan; Prem Kumar, N. Arun; Subrahmanyam, Desiraju; Neeraja, C. N.; Kuchi, Surekha; Jha, Ashwani; Parsad, Rajender; Sitaramam, Vetury; Raghuram, Nandula (20 January 2021).
75:
can occur, nitrate is usually the predominant form of available nitrogen that is absorbed. However this is not always the case as ammonia can predominate in grasslands and in flooded, anaerobic soils like
241:
Nitrogen use efficiency can be measured at various levels: the crop plant, the soil, by fertilizer input, by ecosystem productivity, etc. At the level of photosynthesis in leaves, it is termed
130:
while in the root it uses a form of ferredoxin (Fd3) that has a less negative midpoint potential and can be reduced easily by NADPH. In non photosynthesizing tissues, NADPH is generated by
215:
O -> RCOOH +OH) The potassium ions are then recirculated up the xylem with fresh nitrate. Thus the plants avoid having to absorb and store excess salts and also transport the OH.
165:(GDH) does not play a direct role in the assimilation, it protects the mitochondrial functions during periods of high nitrogen metabolism and takes part in nitrogen remobilization.
1036:
Allen, Susan; J. A. Raven (1987-04-01). "Intracellular pH Regulation in
Ricinus communis Grown with Ammonium or Nitrate as N Source: The Role of Long Distance Transport".
234:) and production cost and increasing yield. Worldwide, crops generally have less than 50% NUE. Better fertilizers, improved crop management, selective breeding, and
608:
Masclaux-Daubresse, C.; Reisdorf-Cren, M.; Pageau, K.; Lelandais, M.; Grandjean, O.; Kronenberger, J.; Valadier, M. H.; Feraud, M.; Jouglet, T.; Suzuki, A. (2006).
157:) transfer the amide group onto a 2-oxoglutarate molecule producing two glutamates. Further transaminations are carried out make other amino acids (most commonly
348:
Jackson, L. E.; Schimel, J. P.; Firestone, M. K. (1989). "Short-term partitioning of ammonium and nitrate between plants and microbes in an annual grassland".
867:"Influence of the Level of Nitrate Nutrition on Ion Uptake and Assimilation, Organic Acid Accumulation, and Cation-Anion Balance in Whole Tomato Plants"
305:
Nadelhoffer, KnuteJ.; JohnD. Aber; JerryM. Melillo (1984-10-01). "Seasonal patterns of ammonium and nitrate uptake in ten temperate forest ecosystems".
1074:
610:"Glutamine Synthetase-Glutamate Synthase Pathway and Glutamate Dehydrogenase Play Distinct Roles in the Sink-Source Nitrogen Cycle in Tobacco"
660:"Real time visualization of 13N-translocation in rice under different environmental conditions using positron emitting Ttacer imaging system"
1403:
1197:"Strategies for engineering improved nitrogen use efficiency in crop plants via redistribution and recycling of organic nitrogen"
96:
1342:
Funk, Jennifer L. (2008-10-15). "Differences in plasticity between invasive and native plants from a low resource environment".
799:"How stable isotopes may help to elucidate primary nitrogen metabolism and its interaction with (photo)respiration in C3 leaves"
1457:
1252:
Congreves, Kate A.; Otchere, Olivia; Ferland, Daphnée; Farzadfar, Soudeh; Williams, Shanay; Arcand, Melissa M. (4 June 2021).
1437:
1146:"Nitrogen Use Efficiency Phenotype and Associated Genes: Roles of Germination, Flowering, Root/Shoot Length and Biomass"
1432:
1127:
1477:
1442:
123:
577:"Localization of Nitrate Reduction in Ferns and Its Relationship to Environment and Physiological Characteristics"
1513:
150:
536:"The contribution of roots and shoots to whole plant nitrate reduction in fast- and slow-growing grass species"
1472:
1396:
1082:
1452:
1424:
1677:
154:
135:
55:
for their needs. Other organisms, like animals, depend entirely on organic nitrogen from their food.
1636:
1482:
1389:
1447:
1662:
838:
Lea, P. J.; Miflin, B. J. (2003). "Glutamate synthase and the synthesis of glutamate in plants".
459:"Nitrate uptake along the maize primary root: An integrated physiological and molecular approach"
162:
418:"The relationship between rhizosphere nitrification and nitrogen-use efficiency in rice plants"
1467:
1351:
92:
275:
141:
In the chloroplasts, glutamine synthetase incorporates this ammonia as the amide group of
126:. In photosynthesizing tissues, it uses an isoform of ferredoxin (Fd1) that is reduced by
8:
1672:
1579:
1518:
1462:
1106:
Fageria, N.K.; Baligar, V.C. (2005). "Enhancing
Nitrogen Use Efficiency in Crop Plants".
262:
Xu, G.; Fan, X.; Miller, A. J. (2012). "Plant
Nitrogen Assimilation and Use Efficiency".
235:
88:
1355:
575:
Stewart, G. R.; Popp, M.; Holzapfel, I.; Stewart, J. A.; Dickie-Eskew, A. N. N. (1986).
457:
Sorgonà, A.; Lupini, A.; Mercati, F.; Di Dio, L.; Sunseri, F.; Abenavoli, M. R. (2011).
1610:
1584:
1574:
1367:
1324:
1280:
1253:
1234:
1172:
1145:
1013:
981:"Effect of Phloem-Translocated Malate on NO3− Uptake by Roots of Intact Soybean Plants"
980:
956:
923:
634:
609:
593:
576:
330:
287:
1119:
899:
866:
851:
774:
749:
377:"Nitrogen cycling in rice paddy environments: Past achievements and future challenges"
1667:
1589:
1564:
1559:
1363:
1285:
1238:
1226:
1196:
1177:
1123:
1053:
1018:
1000:
961:
943:
904:
886:
820:
779:
730:
689:
684:
659:
639:
557:
519:
502:
480:
475:
458:
439:
434:
417:
398:
361:
322:
279:
231:
111:
40:
1371:
1328:
334:
291:
1528:
1359:
1316:
1275:
1265:
1216:
1208:
1167:
1157:
1115:
1045:
1008:
992:
951:
935:
924:"Charge Balance in NO3−-Fed Soybean Estimation of K+ and Carboxylate Recirculation"
894:
878:
847:
810:
769:
761:
720:
679:
671:
629:
621:
588:
547:
514:
470:
429:
388:
357:
314:
271:
1549:
1492:
1412:
1212:
725:
708:
1605:
1381:
173:
1320:
607:
27:
from inorganic nitrogen compounds present in the environment. Organisms like
1656:
1523:
1270:
1162:
1057:
1004:
947:
890:
326:
127:
114:
using NADH or NADPH. Nitrite is then reduced to ammonia in the chloroplasts (
72:
1641:
1569:
1554:
1289:
1230:
1181:
1049:
1022:
965:
908:
824:
783:
734:
693:
643:
561:
484:
443:
402:
283:
102:
Nitrate reduction is carried out in two steps. Nitrate is first reduced to
765:
675:
625:
393:
376:
1620:
1544:
1307:
in a Mesic Native
Grassland Promotes Rapid Carbon and Nitrogen Accrual".
1303:
McKinley, Duncan C.; Blair, John M. (2008). "Woody Plant
Encroachment by
996:
815:
798:
552:
535:
77:
1221:
939:
882:
1416:
318:
158:
131:
119:
81:
24:
1487:
978:
304:
146:
142:
1195:
Melino, Vanessa J; Tester, Mark A; Okamoto, Mamoru (February 2022).
921:
168:
36:
20:
1615:
1142:
196:
115:
103:
52:
48:
1251:
748:
Hanke, G. T.; Kimata-Ariga, Y.; Taniguchi, I.; Hase, T. (2004).
979:
Touraine, Bruno; Bertrand Muller; Claude
Grignon (1992-07-01).
707:
Schjoerring, J. K.; Husted, S.; Mäck, G.; Mattsson, M. (2002).
192:
63:
Plants absorb nitrogen from the soil in the form of nitrate (NO
28:
922:
Touraine, Bruno; Nicole
Grignon; Claude Grignon (1988-11-01).
747:
534:
Scheurwater, I.; Koren, M.; Lambers, H.; Atkin, O. K. (2002).
706:
32:
750:"A Post Genomic Characterization of Arabidopsis Ferredoxins"
656:
533:
1254:"Nitrogen Use Efficiency Definitions of Today and Tomorrow"
574:
456:
503:"Nitrate uptake and reduction in higher and lower plants"
374:
864:
375:
Ishii, S.; Ikeda, S.; Minamisawa, K.; Senoo, K. (2011).
199:. Other plants like the soybean balance most of their NO
347:
601:
865:
Kirkby, Ernest A.; Alistair H. Knight (1977-09-01).
709:"The regulation of ammonium translocation in plants"
1194:
58:
169:pH and Ionic balance during nitrogen assimilation
1654:
1411:
1035:
700:
1105:
796:
527:
416:Li, Y. L. N.; Fan, X. R.; Shen, Q. R. (2007).
298:
178:to alkali while the potassium is recirculated.
1397:
1302:
650:
87:Ammonium ions are absorbed by the plant via
261:
1404:
1390:
1101:
1099:
568:
496:
494:
450:
341:
222:
1279:
1269:
1220:
1171:
1161:
1012:
955:
898:
837:
814:
773:
741:
724:
683:
633:
592:
551:
518:
474:
433:
415:
392:
1296:
790:
500:
172:
1096:
831:
491:
368:
1655:
1069:
1067:
243:photosynthetic nitrogen use efficiency
203:intake with the excretion of OH or HCO
47:) depend on the ability to assimilate
1385:
409:
276:10.1146/annurev-arplant-042811-105532
255:
1341:
1335:
149:as a substrate. Glutamate synthase (
1064:
186:To maintain ionic balance, every NO
161:) from glutamine. While the enzyme
13:
594:10.1111/j.1469-8137.1986.tb02905.x
14:
1689:
840:Plant Physiology and Biochemistry
797:Tcherkez, G.; Hodges, M. (2007).
1364:10.1111/j.1365-2745.2008.01435.x
1201:Current Opinion in Biotechnology
520:10.1046/j.1365-3040.2000.00595.x
476:10.1111/j.1365-3040.2011.02311.x
435:10.1111/j.1365-3040.2007.01737.x
1245:
1188:
1136:
1029:
972:
915:
858:
59:Nitrogen assimilation in plants
1038:Journal of Experimental Botany
803:Journal of Experimental Botany
713:Journal of Experimental Botany
540:Journal of Experimental Botany
264:Annual Review of Plant Biology
1:
1120:10.1016/S0065-2113(05)88004-6
852:10.1016/S0981-9428(03)00060-3
463:Plant, Cell & Environment
422:Plant, Cell & Environment
350:Soil Biology and Biochemistry
248:
1213:10.1016/j.copbio.2021.09.003
362:10.1016/0038-0717(89)90152-1
19:is the formation of organic
7:
1448:Magnesium deficiency#Plants
507:Plant, Cell and Environment
82:non-nodule-forming bacteria
10:
1694:
1258:Frontiers in Plant Science
1150:Frontiers in Plant Science
1081:. UC Davis. Archived from
71:). In aerobic soils where
1629:
1598:
1537:
1501:
1423:
1321:10.1007/s10021-008-9133-4
1079:Seed Biotechnology Center
1075:"Nitrogen Use Efficiency"
726:10.1093/jexbot/53.370.883
381:Microbes and Environments
136:pentose phosphate pathway
1637:Algal nutrient solutions
1483:Micronutrient deficiency
1271:10.3389/fpls.2021.637108
1163:10.3389/fpls.2020.587464
1514:Phosphorus assimilation
228:Nitrogen use efficiency
223:Nitrogen use efficiency
163:glutamate dehydrogenase
179:
1509:Nitrogen assimilation
1468:Phosphorus deficiency
1458:Molybdenum deficiency
766:10.1104/pp.103.032755
676:10.1104/pp.125.4.1743
626:10.1104/pp.105.071910
501:Tischner, R. (2000).
394:10.1264/jsme2.me11293
176:
17:Nitrogen assimilation
1524:Microbial assistance
1473:Potassium deficiency
1453:Manganese deficiency
1305:Juniperus virginiana
1108:Advances in Agronomy
1050:10.1093/jxb/38.4.580
997:10.1104/pp.99.3.1118
110:) in the cytosol by
93:glutamine synthetase
89:ammonia transporters
1580:Nutrient management
1519:Sulfur assimilation
1463:Nitrogen deficiency
1356:2008JEcol..96.1162F
940:10.1104/pp.88.3.605
883:10.1104/pp.60.3.349
236:genetic engineering
1611:Nutrient pollution
1585:Organic fertilizer
1575:Nutrient budgeting
1438:Calcium deficiency
1344:Journal of Ecology
816:10.1093/jxb/erm115
553:10.1093/jxb/erf008
546:(374): 1635–1642.
319:10.1007/BF02140039
238:can increase NUE.
180:
97:glutamate synthase
67:) and ammonium (NH
1650:
1649:
1590:Plant tissue test
1565:Hydroponic dosers
1560:Hoagland solution
513:(10): 1005–1024.
232:fertilizer runoff
124:nitrite reductase
112:nitrate reductase
1685:
1678:Plant physiology
1630:Related concepts
1529:Photorespiration
1433:Boron deficiency
1406:
1399:
1392:
1383:
1382:
1376:
1375:
1350:(6): 1162–1173.
1339:
1333:
1332:
1300:
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1293:
1283:
1273:
1249:
1243:
1242:
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1103:
1094:
1093:
1091:
1090:
1071:
1062:
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1033:
1027:
1026:
1016:
991:(3): 1118–1123.
985:Plant Physiology
976:
970:
969:
959:
928:Plant Physiology
919:
913:
912:
902:
871:Plant Physiology
862:
856:
855:
846:(6–7): 555–564.
835:
829:
828:
818:
809:(7): 1685–1693.
794:
788:
787:
777:
754:Plant Physiology
745:
739:
738:
728:
719:(370): 883–890.
704:
698:
697:
687:
670:(4): 1743–1753.
664:Plant Physiology
654:
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614:Plant Physiology
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469:(7): 1127–1140.
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1646:
1625:
1594:
1550:Fertilizer tree
1533:
1497:
1493:Fertilizer burn
1478:Zinc deficiency
1443:Iron deficiency
1419:
1413:Plant nutrition
1410:
1380:
1379:
1340:
1336:
1301:
1297:
1250:
1246:
1193:
1189:
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1137:
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581:New Phytologist
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118:in roots) by a
109:
70:
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61:
46:
43:nitrogen gas (N
23:compounds like
12:
11:
5:
1691:
1681:
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1663:Nitrogen cycle
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1606:Soil fertility
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1334:
1315:(3): 454–468.
1295:
1244:
1187:
1135:
1128:
1095:
1063:
1044:(4): 580–596.
1028:
971:
934:(3): 605–612.
914:
877:(3): 349–353.
857:
830:
789:
760:(1): 255–264.
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620:(2): 444–456.
600:
587:(3): 373–384.
567:
526:
490:
449:
408:
387:(4): 282–292.
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356:(3): 409–415.
340:
313:(3): 321–335.
307:Plant and Soil
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1599:Miscellaneous
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1085:on 2021-05-16
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1642:Biostimulant
1570:Living mulch
1555:Green manure
1508:
1502:Assimilation
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1222:10754/672009
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1087:. Retrieved
1083:the original
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78:rice paddies
62:
35:and certain
16:
15:
1621:Agrobiology
1545:Fertigation
1207:: 263–269.
270:: 153–182.
25:amino acids
1673:Metabolism
1657:Categories
1425:Imbalances
1417:Fertilizer
1309:Ecosystems
1264:: 637108.
1156:: 587464.
1114:: 97–185.
1089:2019-11-23
249:References
159:asparagine
155:NADH-GOGAT
132:glycolysis
122:dependent
120:ferredoxin
1488:Chlorosis
1239:237626832
1058:0022-0957
1005:0032-0889
948:0032-0889
891:0032-0889
327:0032-079X
147:glutamate
143:glutamine
39:that can
1668:Nitrogen
1372:84336174
1329:23911766
1290:34177975
1231:34560475
1182:33552094
1023:16668978
966:16666356
909:16660091
825:17646207
784:14684843
735:11912231
694:11299355
644:16407450
562:12096102
485:21410710
444:17944815
403:22008507
335:40749543
292:20690850
284:22224450
245:(PNUE).
151:Fd-GOGAT
134:and the
116:plastids
37:bacteria
21:nitrogen
1616:Soil pH
1538:Methods
1352:Bibcode
1281:8220819
1173:7855041
1014:1080591
957:1055632
635:1361315
197:oxalate
104:nitrite
53:ammonia
49:nitrate
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1327:
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193:malate
145:using
29:plants
1368:S2CID
1325:S2CID
1235:S2CID
685:88831
331:S2CID
288:S2CID
33:fungi
1286:PMID
1227:PMID
1178:PMID
1124:ISBN
1054:ISSN
1019:PMID
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821:PMID
780:PMID
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323:ISSN
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195:and
153:and
1360:doi
1317:doi
1276:PMC
1266:doi
1217:hdl
1209:doi
1168:PMC
1158:doi
1116:doi
1046:doi
1009:PMC
993:doi
952:PMC
936:doi
895:PMC
879:doi
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811:doi
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680:PMC
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