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Cytokinin

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states that auxin from apical buds travels down shoots to inhibit axillary bud growth. This promotes shoot growth, and restricts lateral branching. Cytokinin moves from the roots into the shoots, eventually signaling lateral bud growth. Simple experiments support this theory. When the apical bud is removed, the axillary buds are uninhibited, lateral growth increases, and plants become bushier. Applying auxin to the cut stem again inhibits lateral dominance. Moreover, it has been shown that cytokinin alone has no effect on
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Cytokinins are involved in many plant processes, including cell division and shoot and root morphogenesis. They are known to regulate axillary bud growth and apical dominance. According to the "direct inhibition hypothesis", these effects result from the ratio of cytokinin to auxin. This theory
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and other actively dividing tissues also synthesize cytokinins. No phenylurea cytokinins have been found in plants. Cytokinins participate in local and long-distance signalling, with the same transport mechanism as purines and nucleosides. Typically, cytokinins are transported in the
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cells. When cultured with auxin but no cytokinin, they grow large but do not divide. When cytokinin and auxin are both added together, the cells expand and differentiate. When cytokinin and auxin are present in equal levels, the parenchyma cells form an undifferentiated
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because of its ability to promote cell division and was the first cytokinin to be named. Kinetin was later identified to be 6-furfuryl-amino purine. Later on, the generic name kinin was suggested to include kinetin and other substances having similar properties.
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of the receptor, with the phosphate then being transferred to a phosphotransfer protein. The phosphotransfer proteins can then phosphorylate the type-B response regulators (RR) which are a family of
145:, who, in 1892, proposed that initiation of cell division is evoked by endogenous factors, indeed a proper balance among endogenous factors. Somewhat later, the Austrian plant physiologist, 1550: 320: 874:"Plant Physiology: The Lore of Living Plants . By Johannes van Overbeek and Harry K. Wong. National Science Teachers Association, Washington, D.C., 1964. 160 pp. 50g" 1144:"Cytokinins mediate resistance against Pseudomonas syringae in tobacco through increased antimicrobial phytoalexin synthesis independent of salicylic acid signaling" 183:(1954) extended the work of Haberlandt and reported that a substance present in the vascular tissue was responsible for causing cell division in the pith cells. 1736: 1395:"Expression of cytokinin biosynthetic isopentenyltransferase genes in Arabidopsis: tissue specificity and regulation by auxin, cytokinin, and nitrate" 829:
VAN Overbeek J, Conklin ME, Blakeslee AF (October 1941). "Factors in Coconut Milk Essential for Growth and Development of Very Young Datura Embryos".
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The first naturally occurring cytokinin was isolated and crystallised simultaneously by Miller and D.S. Lethum (1963–65) from the milky endosperm of
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Cytokinins have recently been found to play a role in plant pathogenesis. For example, cytokinins have been described to induce resistance against
1436:"Auxin regulation of cytokinin biosynthesis in Arabidopsis thaliana: a factor of potential importance for auxin-cytokinin-regulated development" 456:, however they have yet to be widely adopted, probably due to the complex nature of their effects. One study found that applying cytokinin to 1571: 1037: 808: 551: 1103:"The cytokinin-activated transcription factor ARR2 promotes plant immunity via TGA3/NPR1-dependent salicylic acid signaling in Arabidopsis" 1248:
Decker EL, Frank W, Sarnighausen E, Reski R (May 2006). "Moss systems biology en route: phytohormones in Physcomitrella development".
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leaves remained mostly green. It was hypothesized that cytokinin may affect enzymes that regulate protein synthesis and degradation.
1193:"Cytokinin production by Pseudomonas fluorescens G20-18 determines biocontrol activity against Pseudomonas syringae in Arabidopsis" 301:, this class of plant hormones specifically induces the transition from apical growth to growth via a three-faced apical cell in 422:
and carrying an already-prenylated adenosine adjacent to the anticodon release on degradation the adenosine as a cytokinin. The
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The idea of specific substances required for cell division to occur in plants actually dates back to the German physiologist
973:"A New Classic of Cytokinin Research: Cytokinin-Deficient Arabidopsis Plants Provide New Insights into Cytokinin Biology" 247:
from nearby tissues. A study that regulated leaf senescence in tobacco leaves found that wild-type leaves yellowed while
1605: 384: 339:. The phosphorylated, and thus activated, type-B RRs regulate the transcription of numerous genes, including the type-A 427: 380: 176: 149:, reported in 1913 that an unknown substance diffuses from the phloem tissue which can induce cell division in the 376: 309: 79: 1191:
Großkinsky DK, Tafner R, Moreno MV, Stenglein SA, García de Salamone IE, Nelson LM, et al. (March 2016).
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in plants is mediated by a two-component phosphorelay. This pathway is initiated by cytokinin binding to a
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Grosskinsky DK, Naseem M, Abdelmohsen UR, Plickert N, Engelke T, Griebel T, et al. (October 2011).
494:"Thidiazuron-Induced Tissue Culture Regeneration from Quartered-Seed Explants of Arachis paraguariensis" 392: 368: 328: 225: 187:
and his co-workers (1954) isolated and purified the cell division substance in crystallised form from
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Koprna R, De Diego N, Dundálková L, Spíchal L (February 2016). "Use of cytokinins as agrochemicals".
1447: 1257: 1204: 838: 336: 262: 256: 1270: 1731: 1580: 745:"Auxins and cytokinins - the dynamic duo of growth-regulating phytohormones heading for new shores" 332: 150: 146: 106: 1670: 901: 676: 513: 133:, another plant growth hormone. The two are complementary, having generally opposite effects. 1567: 1510: 1475: 1416: 1332: 1283: 1230: 1173: 1124: 1083: 1033: 992: 953: 893: 854: 804: 766: 725: 668: 633: 598: 547: 268: 1434:
Nordström A, Tarkowski P, Tarkowska D, Norbaek R, Astot C, Dolezal K, Sandberg G (May 2004).
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led to a 5–10% increase in yield under drought conditions. Some cytokinins are utilized in
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of plant diseases cytokinins seem to have potential functions. Production of cytokinins by
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G20-18 has been identified as a key determinant to efficiently control the infection of
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Campbell NA, Reece JB, Urry LA, Cain ML, Wasserman SA, Minorsky PV, Jackson RB (2008).
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also had this factor, which stimulated cell division and differentiation in very young
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Proceedings of the National Academy of Sciences of the United States of America
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Sakakibara H (2006). "Cytokinins: activity, biosynthesis, and translocation".
248: 996: 897: 569:"Localization of cytokinin biosynthetic sites in pea plants and carrot roots" 1695: 1680: 1557: 1460: 546:(8th ed.). San Francisco: Pearson, Benjamin Cummings. pp. 827–30. 415: 312:
of a specific single cell, and thus is a very specific effect of cytokinin.
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There are two types of cytokinins: adenine-type cytokinins represented by
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Choi J, Huh SU, Kojima M, Sakakibara H, Paek KH, Hwang I (August 2010).
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Cytokinins have been shown to slow aging of plant organs by preventing
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and growth, they have been studied since the 1970s as potential
407: 302: 233: 117:(TDZ). Most adenine-type cytokinins are synthesized in roots. 1594: 616:
Mok DW, Mok MC (June 2001). "Cytokinin Metabolism and Action".
1530:"Plant Hormone Increases Cotton Yields in Drought Conditions" 618:
Annual Review of Plant Physiology and Plant Molecular Biology
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Regulation of Leaf Senescence by Cytokinin, Sugar, and Light
1561: 74:, in plant roots and shoots. They are involved primarily in 1393:
Miyawaki K, Matsumoto-Kitano M, Kakimoto T (January 2004).
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breakdown, activating protein synthesis, and assembling
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Chen CM (1998-02-01), "The Discovery of Cytokinins",
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Chen CM, Ertl JR, Leisner SM, Chang CC (July 1985).
343:s. The type-A RRs negatively regulate the pathway. 694:Schaller GE, Bishopp A, Kieber JJ (January 2015). 1558:"Ch. 21: Cytokinins: Regulators of Cell Division" 351:Adenosine phosphate-isopentenyltransferase (IPT) 228:. A higher ratio of cytokinin induces growth of 1024:, vol. 1, WORLD SCIENTIFIC, pp. 1–15, 1352: 1350: 1348: 1346: 917: 915: 795:, New York, NY: Springer US, pp. 147–180, 27:Class of plant hormones promoting cell division 467:of plants and can also be used to promote the 1606: 793:Biochemistry and Physiology of Plant Hormones 194:sperm DNA. This active compound was named as 8: 782: 780: 406:Cytokinins can also be produced by recycled 232:buds, while a higher ratio of auxin induces 743:Großkinsky DK, Petrášek J (February 2019). 1613: 1599: 1591: 537: 535: 533: 531: 529: 527: 308:. This bud induction can be pinpointed to 1469: 1459: 1410: 1374: 1326: 1269: 1224: 1167: 1118: 1077: 1004: 947: 760: 719: 592: 1497:. Recent Developments in Agrochemistry. 665:10.1146/annurev.arplant.57.032905.105231 1388: 1386: 1359:"Cytokinin biosynthesis and perception" 492:Aina O, Quesenberry K, Gallo M (2012). 484: 1301:Hutchison CE, Kieber JJ (2002-01-01). 109:, and phenylurea-type cytokinins like 7: 1495:Bioorganic & Medicinal Chemistry 1303:"Cytokinin signaling in Arabidopsis" 426:of these adenines is carried out by 1737:Aging-related substances in plants 1551:Agrares Fertilizer with cytokinins 401:methylerythritol phosphate pathway 385:hydroxymethylbutenyl pyrophosphate 45:is named after the genus of corn, 25: 787:Moore TC (1979), Moore TC (ed.), 448:Because cytokinins promote plant 1412:10.1046/j.1365-313x.2003.01945.x 1376:10.1111/j.1399-3054.2006.00665.x 630:10.1146/annurev.arplant.52.1.89 129:Cytokinins act in concert with 1357:Hwang I, Sakakibara H (2006). 890:10.1126/science.145.3633.698.c 653:Annual Review of Plant Biology 331:membrane. This results in the 1: 1556:Lincoln T, Zeiger E (2010). 1120:10.1016/j.devcel.2010.07.011 1022:Discoveries in Plant Biology 851:10.1126/science.94.2441.350 801:10.1007/978-1-4684-0079-3_4 510:10.2135/cropsci2011.07.0367 428:tRNA-isopentenyltransferase 381:dimethylallyl pyrophosphate 1753: 1581:Plant Physiology:Cytokinin 1030:10.1142/9789812817563_0001 355:the first reaction in the 293:While cytokinin action in 29: 1666: 1628: 1566:(5th ed.). Sinauer. 1507:10.1016/j.bmc.2015.12.022 1052:Thomas H (January 1978). 971:Eckardt NA (2003-11-01). 436:is known to regulate the 872:Collins S (1964-08-14). 30:Not to be confused with 1461:10.1073/pnas.0402504101 922:Amasino R (July 2005). 391:. This reaction is the 363:cytokinins. It may use 279:Pseudomonas fluorescens 1691:Plant peptide hormones 712:10.1105/tpc.114.133595 337:transcriptions factors 52: 1363:Physiologia Plantarum 1280:10.1055/s-2006-923952 1160:10.1104/pp.111.182931 940:10.1104/pp.104.900160 329:endoplasmic reticulum 272:. Also in context of 161:found that the milky 159:Johannes Van Overbeek 40: 1528:Yao S (March 2010). 1070:10.1104/pp.116.1.329 263:Arabidopsis thaliana 257:Pseudomonas syringae 1452:2004PNAS..101.8039N 1262:2006PlBio...8..397D 1209:2016NatSR...623310G 843:1941Sci....94..350V 749:The New Phytologist 585:10.1104/pp.78.3.510 333:autophosphorylation 321:Cytokinin signaling 107:6-benzylaminopurine 1671:24-Epibrassinolide 1319:10.1105/tpc.010444 1313:(Suppl): S47–S59. 1197:Scientific Reports 1107:Developmental Cell 989:10.1105/tpc.151110 418:that start with a 393:rate-limiting step 274:biological control 82:, but also affect 53: 1714: 1713: 1573:978-0-87893-866-7 1534:News & Events 1446:(21): 8039–8044. 1399:The Plant Journal 1217:10.1038/srep23310 1039:978-981-02-1313-8 983:(11): 2489–2492. 884:(3633): 698–699. 837:(2441): 350–351. 810:978-1-4684-0079-3 762:10.1111/nph.15556 553:978-0-555-03883-3 269:Nicotiana tabacum 90:growth, and leaf 62:) are a class of 16:(Redirected from 1744: 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Haberlandt 144: 136: 134: 132: 127: 125: 120: 116: 112: 108: 104: 100: 95: 93: 89: 85: 81: 77: 73: 69: 68:cell division 66:that promote 65: 61: 57: 50: 49: 44: 39: 33: 19: 1658:Gibberellins 1647: 1562: 1533: 1523: 1498: 1494: 1488: 1443: 1439: 1429: 1402: 1398: 1366: 1362: 1310: 1306: 1296: 1253: 1249: 1243: 1200: 1196: 1186: 1151: 1147: 1137: 1110: 1106: 1096: 1061: 1057: 1047: 1021: 1015: 980: 976: 966: 931: 927: 881: 877: 867: 834: 830: 824: 814:, retrieved 792: 789:"Cytokinins" 752: 748: 738: 706:(1): 44–63. 703: 699: 689: 656: 652: 646: 621: 617: 611: 576: 572: 562: 543: 501: 498:Crop Science 497: 487: 447: 438:biosynthesis 432: 405: 397:biosynthesis 379:and may use 357:biosynthesis 350: 347:Biosynthesis 340: 319: 292: 288:P. syringae. 287: 283: 277: 267: 261: 255: 253: 238: 217: 207: 201: 192:herring fish 175: 165:of immature 140: 128: 111:diphenylurea 96: 88:axillary bud 59: 55: 54: 46: 469:germination 424:prenylation 387:(HMBPP) as 383:(DMAPP) or 299:pleiotropic 284:A. thaliana 236:formation. 157:. In 1941, 115:thidiazuron 78:growth and 72:cytokinesis 1732:Cytokinins 1721:Categories 1681:Jasmonates 1648:Cytokinins 816:2022-06-17 504:(3): 555. 479:References 416:anticodons 377:substrates 249:transgenic 221:parenchyma 189:autoclaved 153:tissue of 143:J. Wiesner 92:senescence 56:Cytokinins 18:Cytokinins 1696:Polyamine 1686:Karrikins 1266:CiteSeerX 1203:: 23310. 997:1040-4651 906:239878163 898:0036-8075 461:seedlings 353:catalyses 306:protonema 245:nutrients 177:Jablonski 173:embryos. 163:endosperm 1676:Florigen 1653:Ethylene 1515:26719210 1480:15146070 1421:14675438 1337:12045269 1288:16807833 1235:26984671 1178:21813654 1129:20708590 1088:24408097 958:16009993 859:17729950 771:30644580 730:25604447 681:25584314 673:16669769 638:11337393 603:16664274 518:82510749 412:bacteria 361:isoprene 214:Function 208:Zea mays 32:Cytokine 1448:Bibcode 1258:Bibcode 1226:4794740 1205:Bibcode 1169:3192561 949:1176392 878:Science 839:Bibcode 831:Science 721:4330578 594:1064767 544:Biology 420:uridine 403:(MEP). 241:protein 196:Kinetin 167:coconut 137:History 119:Cambium 99:kinetin 1638:Auxins 1570:  1513:  1478:  1471:419553 1468:  1419:  1335:  1328:151247 1325:  1286:  1268:  1233:  1223:  1176:  1166:  1127:  1086:  1076:  1036:  1006:540265 1003:  995:  956:  946:  904:  896:  857:  807:  769:  728:  718:  679:  671:  636:  601:  591:  550:  516:  458:cotton 226:callus 185:Miller 171:Datura 105:, and 103:zeatin 43:zeatin 1079:35173 902:S2CID 677:S2CID 514:S2CID 473:seeds 434:Auxin 408:tRNAs 371:, or 286:with 230:shoot 181:Skoog 131:auxin 124:xylem 70:, or 1568:ISBN 1511:PMID 1476:PMID 1417:PMID 1333:PMID 1284:PMID 1231:PMID 1174:PMID 1125:PMID 1084:PMID 1034:ISBN 993:ISSN 954:PMID 894:ISSN 855:PMID 805:ISBN 767:PMID 726:PMID 669:PMID 634:PMID 599:PMID 548:ISBN 444:Uses 303:moss 266:and 234:root 204:corn 179:and 113:and 76:cell 1503:doi 1466:PMC 1456:doi 1444:101 1407:doi 1371:doi 1367:126 1323:PMC 1315:doi 1276:doi 1221:PMC 1213:doi 1164:PMC 1156:doi 1152:157 1115:doi 1074:PMC 1066:doi 1062:142 1026:doi 1001:PMC 985:doi 944:PMC 936:doi 932:138 886:doi 882:145 847:doi 797:doi 757:doi 753:221 716:PMC 708:doi 661:doi 626:doi 589:PMC 581:doi 506:doi 471:of 375:as 373:AMP 369:ADP 365:ATP 359:of 260:in 48:Zea 1723:: 1560:. 1532:. 1509:. 1499:24 1474:. 1464:. 1454:. 1442:. 1438:. 1415:. 1403:37 1401:. 1397:. 1385:^ 1365:. 1361:. 1345:^ 1331:. 1321:. 1311:14 1309:. 1305:. 1282:. 1274:. 1264:. 1252:. 1229:. 1219:. 1211:. 1199:. 1195:. 1172:. 1162:. 1150:. 1146:. 1123:. 1111:19 1109:. 1105:. 1082:. 1072:. 1060:. 1056:. 1032:, 999:. 991:. 981:15 979:. 975:. 952:. 942:. 930:. 926:. 914:^ 900:. 892:. 880:. 876:. 853:. 845:. 835:94 833:. 803:, 791:, 779:^ 765:. 751:. 747:. 724:. 714:. 704:27 702:. 698:. 675:. 667:. 657:57 655:. 632:. 622:52 620:. 597:. 587:. 577:78 575:. 571:. 526:^ 512:. 502:52 500:. 496:. 475:. 430:. 367:, 341:RR 290:. 126:. 101:, 94:. 86:, 60:CK 1614:e 1607:t 1600:v 1576:. 1517:. 1505:: 1482:. 1458:: 1450:: 1423:. 1409:: 1379:. 1373:: 1339:. 1317:: 1290:. 1278:: 1260:: 1254:8 1237:. 1215:: 1207:: 1201:6 1180:. 1158:: 1131:. 1117:: 1090:. 1068:: 1028:: 1009:. 987:: 960:. 938:: 908:. 888:: 861:. 849:: 841:: 799:: 773:. 759:: 732:. 710:: 683:. 663:: 640:. 628:: 605:. 583:: 556:. 520:. 508:: 206:( 58:( 51:. 20:)

Index

Cytokinins
Cytokine

zeatin
Zea
plant hormones
cell division
cytokinesis
cell
differentiation
apical dominance
axillary bud
senescence
kinetin
zeatin
6-benzylaminopurine
diphenylurea
thidiazuron
Cambium
xylem
auxin
J. Wiesner
G. Haberlandt
parenchymatic
potato tubers
Johannes Van Overbeek
endosperm
coconut
Datura
Jablonski

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