Abstract
Background: Sorghum, the C4 dry-land cereal, important for food, fodder, feed and fuel, is a model crop for abiotic stress tolerance with smaller genome size, genetic diversity, and bioenergy traits. The heat shock proteins/chaperonin 60s (HSP60/Cpn60s) assist the plastid proteins, and participate in the folding and aggregation of proteins. However, the functions of HSP60s in abiotic stress tolerance in Sorghum remain unclear.
Methods: Genome-wide screening and in silico characterization of SbHSP60s were carried out along with tissue and stress-specific expression analysis.
Results: A total of 36 HSP60 genes were identified in Sorghum bicolor. They were subdivided into 2 groups, the HSP60 and HSP10 co-chaperonins encoded by 30 and 6 genes, respectively. The genes are distributed on all the chromosomes, chromosome 1 being the hot spot with 9 genes. All the HSP60s were found hydrophilic and highly unstable. The HSP60 genes showed a large number of introns, the majority of them with more than 10. Among the 12 paralogs, only 1 was tandem and the remaining 11 segmental, indicating their role in the expansion of SbHSP60s. Majority of the SbHSP60 genes expressed uniformly in leaf while a moderate expression was observed in the root tissues, with the highest expression displayed by SbHSP60-1. From expression analysis, SbHSP60- 3 for drought, SbHSP60-9 for salt, SbHSP60-9 and 24 for heat and SbHSP60-3, 9 and SbHSP10- 2 have been found implicated for cold stress tolerance and appeared as the key regulatory genes.
Conclusion: This work paves the way for the utilization of chaperonin family genes for achieving abiotic stress tolerance in plants.
Keywords: HSP60, HSP10, abiotic stress-responsive, phylogenetic tree, gene expressions, chaperonin.
Graphical Abstract
[http://dx.doi.org/10.1201/9781351071796]
[http://dx.doi.org/10.1007/s11101-017-9508-2]
[http://dx.doi.org/10.1007/978-1-4614-0634-1_1]
[http://dx.doi.org/10.1016/j.envexpbot.2007.05.011]
[http://dx.doi.org/10.1016/j.fcr.2005.08.018]
[http://dx.doi.org/10.1093/aob/mcl037] [PMID: 16497700]
[http://dx.doi.org/10.1016/j.plantsci.2005.09.005]
[http://dx.doi.org/10.1007/978-90-481-3112-9]
[http://dx.doi.org/10.1146/annurev.pp.42.060191.003051]
[http://dx.doi.org/10.3389/fpls.2016.00114] [PMID: 26904076]
[http://dx.doi.org/10.1038/381571a0] [PMID: 8637592]
[http://dx.doi.org/10.1016/j.tplants.2004.03.006] [PMID: 15130550]
[http://dx.doi.org/10.1016/j.lfs.2009.12.015] [PMID: 20060844]
[PMID: 2577724]
[http://dx.doi.org/10.1038/nature10317] [PMID: 21776078]
[http://dx.doi.org/10.1126/science.aac4354] [PMID: 27365453]
[http://dx.doi.org/10.1016/S0092-8674(00)80928-9] [PMID: 9476895]
[http://dx.doi.org/10.1016/S0092-8674(00)81152-6] [PMID: 9546398]
[http://dx.doi.org/10.1146/annurev.biochem.67.1.581] [PMID: 9759498]
[http://dx.doi.org/10.1038/nrm3658] [PMID: 24026055]
[http://dx.doi.org/10.1379/1466-1268(2001)006<0190:ATTIAI>2.0.CO;2] [PMID: 11599560]
[http://dx.doi.org/10.1038/371578a0] [PMID: 7935790]
[http://dx.doi.org/10.1371/journal.pbio.1001040] [PMID: 21483722]
[http://dx.doi.org/10.1016/0378-1119(90)90385-5] [PMID: 1979547]
[http://dx.doi.org/10.1006/bbrc.1999.1868] [PMID: 10600546]
[http://dx.doi.org/10.1186/1471-2229-9-38] [PMID: 19344532]
[http://dx.doi.org/10.1104/pp.105.1.233] [PMID: 7913238]
[http://dx.doi.org/10.1016/S0959-440X(00)00074-9] [PMID: 10753820]
[http://dx.doi.org/10.1146/annurev.cellbio.23.090506.123555] [PMID: 17489689]
[http://dx.doi.org/10.1007/s11120-004-2216-y] [PMID: 16143837]
[http://dx.doi.org/10.1016/j.bbabio.2015.01.002] [PMID: 25596449]
[http://dx.doi.org/10.1038/333330a0] [PMID: 2897629]
[http://dx.doi.org/10.1021/acs.biochem.8b00132] [PMID: 29589905]
[http://dx.doi.org/10.1093/emboj/17.12.3471] [PMID: 9628882]
[http://dx.doi.org/10.1093/pcp/pcy199] [PMID: 30289547]
[http://dx.doi.org/10.1007/s11103-008-9432-3] [PMID: 19031045]
[http://dx.doi.org/10.1007/BF00019202] [PMID: 1349837]
[http://dx.doi.org/10.1007/s12192-012-0334-6] [PMID: 22434146]
[http://dx.doi.org/10.1007/s00425-019-03290-4] [PMID: 31606756]
[http://dx.doi.org/10.1007/s12374-012-0271-z]
[http://dx.doi.org/10.1016/0014-5793(92)80883-I] [PMID: 1352261]
[http://dx.doi.org/10.1074/jbc.270.30.18158] [PMID: 7629128]
[http://dx.doi.org/10.1007/s11033-016-4012-0] [PMID: 27206926]
[http://dx.doi.org/10.1016/S0176-1617(11)82103-6]
[http://dx.doi.org/10.2135/cropsci2000.4041026x]
[http://dx.doi.org/10.1007/s11120-013-9862-x] [PMID: 23771643]
[http://dx.doi.org/10.1111/nph.12869] [PMID: 24898064]
[http://dx.doi.org/10.1016/0378-3774(83)90084-7]
[http://dx.doi.org/10.1371/journal.pone.0209980] [PMID: 30650107]
[http://dx.doi.org/10.1093/bioinformatics/bts520] [PMID: 22923302]
[http://dx.doi.org/10.1093/nar/gkt1110] [PMID: 24217918]
[http://dx.doi.org/10.1093/nar/gkh088] [PMID: 14681379]
[http://dx.doi.org/10.1385/1-59259-890-0:571]
[http://dx.doi.org/10.1360/yc-007-1023] [PMID: 17681935]
[PMID: 17517783]
[http://dx.doi.org/10.1093/bioinformatics/17.7.646] [PMID: 11448883]
[http://dx.doi.org/10.1002/pmic.200300771] [PMID: 15174133]
[http://dx.doi.org/10.1093/nar/gkl198] [PMID: 16845028]
[http://dx.doi.org/10.1093/nar/27.1.297] [PMID: 9847208]
[http://dx.doi.org/10.1093/nar/30.1.325] [PMID: 11752327]
[http://dx.doi.org/10.1093/molbev/mst197] [PMID: 24132122]
[http://dx.doi.org/10.1093/nar/gkl315] [PMID: 16845082]
[http://dx.doi.org/10.1093/nar/gkr319] [PMID: 21622958]
[http://dx.doi.org/10.1093/database/baw099] [PMID: 27352859]
[http://dx.doi.org/10.1104/pp.104.900198] [PMID: 16896229]
[http://dx.doi.org/10.1371/journal.pone.0208409] [PMID: 30540790]
[http://dx.doi.org/10.1186/1471-2105-13-134] [PMID: 22708584]
[http://dx.doi.org/10.3389/fpls.2016.00529] [PMID: 27200008]
[http://dx.doi.org/10.1093/nar/30.9.e36] [PMID: 11972351]
[http://dx.doi.org/10.3389/fpls.2015.00806] [PMID: 26483820]
[http://dx.doi.org/10.1379/1466-1268(2001)006<0225:TEFOAT>2.0.CO;2] [PMID: 11599564]
[http://dx.doi.org/10.1111/j.1365-313X.2006.02940.x] [PMID: 17144892]
[http://dx.doi.org/10.1016/j.plantsci.2009.01.016] [PMID: 26493149]
[http://dx.doi.org/10.1038/srep32641] [PMID: 27586959]
[http://dx.doi.org/10.1016/j.gene.2018.08.049] [PMID: 30110648]
[http://dx.doi.org/10.1186/s12864-015-1398-3] [PMID: 25887520]
[http://dx.doi.org/10.1021/ac701690d] [PMID: 18085750]
[http://dx.doi.org/10.1186/1471-2229-4-10] [PMID: 15171794]
[http://dx.doi.org/10.1093/molbev/msm003] [PMID: 17218642]
[http://dx.doi.org/10.1021/pr400628j] [PMID: 24083463]
[http://dx.doi.org/10.1046/j.1365-313X.1998.00227.x] [PMID: 9753781]
[http://dx.doi.org/10.1073/pnas.0706547105] [PMID: 18077346]
[http://dx.doi.org/10.1104/pp.109.136630] [PMID: 19279195]
[http://dx.doi.org/10.1111/pce.12130] [PMID: 23651319]
[http://dx.doi.org/10.1111/pbi.12296] [PMID: 25572837]
[http://dx.doi.org/10.1261/rna.895308] [PMID: 18356539]
[http://dx.doi.org/10.1016/j.bbrc.2007.01.022] [PMID: 17254555]
[http://dx.doi.org/10.1021/jf300724t] [PMID: 22712679]
[http://dx.doi.org/10.1093/jxb/erv450] [PMID: 26466661]
[http://dx.doi.org/10.1023/A:1006095023050] [PMID: 9678581]
[http://dx.doi.org/10.1105/tpc.010410] [PMID: 11910004]
[http://dx.doi.org/10.1074/jbc.M409674200] [PMID: 15509567]
[http://dx.doi.org/10.2135/cropsci2010.03.0152]
[http://dx.doi.org/10.1016/0014-5793(95)01534-5] [PMID: 8603711]
[http://dx.doi.org/10.1007/s10059-013-2337-2] [PMID: 23620301]
[http://dx.doi.org/10.1186/1471-2164-8-125] [PMID: 17519032]
[http://dx.doi.org/10.1105/tpc.110.076018] [PMID: 21307284]
[http://dx.doi.org/10.1016/j.jbiotec.2016.05.115]
[http://dx.doi.org/10.4161/psb.5.11.13020] [PMID: 20980831]