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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (5): 1119-1128.doi: 10.3724/SP.J.1006.2022.12022

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS • Previous Articles     Next Articles

Functional studies of rice blast resistance related gene OsSAMS1

YANG De-Wei1,2(), WANG Xun1(), ZHENG Xing-Xing1, XIANG Xin-Quan1, CUI Hai-Tao1, LI Sheng-Ping1,*(), TANG Ding-Zhong1,*()   

  1. 1College of Agriculture, Fujian Provincial Key Laboratory of Crop Breeding by Design, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
    2Institute of Rice, Fujian Academy of Agricultural Sciences, Fuzhou 350018, Fujian, China
  • Received:2021-04-02 Accepted:2021-09-09 Online:2022-05-12 Published:2021-10-18
  • Contact: LI Sheng-Ping,TANG Ding-Zhong E-mail:dewei-y@163.com;1448293617@qq.com;lishun1981@126.com;dztang@fafu.edu.cn
  • About author:First author contact:**Contributed equally to this work
  • Supported by:
    Special Fund for Agro-scientific Research in the Public Interest of Fujian Province(2020R11010016-3);Natural Science Foundation of Fujian Province(2019J01424);Major Science and Technology Projects of Fujian Province(2020NZ08016)

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Abstract:

Rice blast is one of the most devastating diseases in rice, which causes great economic losses to agricultural production. It has been reported that S-Adenosyl-l-Mmethionine Synthetase 1 (OsSAMS1) is involved in the process of senescence in rice. Transcriptome sequencing analysis showed that the relative expression level of OsSAMS1 was significantly increased after inoculation with Magnaporthe oryzae (M. oryzae). However, it remains unclear whether OsSAMS1 is involved in rice immunity. To verify this, we constructed the knock-out mutants of OsSAMS1 in the wild type variety ZH11. The results showed that OsSAMS1 was mainly expressed in rice leaves, and its expression was significantly induced by M. oryzae inoculation. Subcellular localization revealed that OsSAMS1 was distributed in the plasma membrane, cytoplasm, and nucleus. Compared to the wild type, the two knockout mutants, ossams1-1 and ossams1-2, displayed enhanced susceptibility upon M. oryzae infection, and the expression of pathogenesis-related (PR) genes was significantly inhibited. In addition, ethylene synthesis-related genes were also dramatically decreased in both two mutants. These results suggested that OsSAMS1 was involved in rice immune response and positively regulated rice blast resistance, which lays a foundation for further revealing the molecular mechanism of OsSAMS1 in plant immunity and provides genetic resources for rice breeding of blast resistance.

Key words: rice, rice blast disease, OsSAMS1, ethylene, function research

Table 1

Primers of OsSAMS1 used in the study"

引物名称
Primer name		 前引物
Forward sequence (5′-3′)		 后引物
Reverse sequence (5′-3′)
PR1a CGTGTCGGCGTGGGTGT GGCGAGTAGTTGCAGGTGATG
PR5 CAACAGCAACTACCAAGTCGTCTT CAAGGTGTCGTTTTATTCATCAACTTT
PR6 CAACAGCAACTACCAAGTCGTCTT CAAGGTGTCGTTTTATTCATCAACTTT
PR10 CCCTGCCGAATACGCCTAA CTCAAACGCCACGAGAATTTG
OsACS1 ACCAAGATGTCCAGCTTCGG GAGGAGGTACTGCGTCTGGG
OsACS2 GGAATAAAGCTGCTGCCGAT TGAGCCTGAAGTCGTTGAAGC
OsACS4 GATGTTGCGCTGGAGAGGATA TTCCCAATTGTTGCTTTGCA
OsACS6 ACAATCAGGCAAAGAAGCGAG TTGGATATGAGAACCCCACGA
SAMS1-GFP ATTTGGAGAGGACAGGGTACCATGGCCGCACTTGATACCTTC AGTGTCGACTCTAGAGGATCCGGCAGAAGGCTTCTCCCACT
SAMS1-qRT-PCR TTCTCTGGCAAGGACCCAAC GGACACCGATGGCGTATGAT
Ubiquitin AACCAGCTGAGGCCCAAGA ACGATTGATTTAACCAGTCCATGA
gRNAs-sams1-1 GTGAGACCTGCACCAAGACA GAGATGAGGACGGTGTGGAC
gRNAs-sams1-2 GTGAGACCTGCACCAAGACA GAGATGAGGACGGTGTGGAC

Fig. 1

Relative expression profiles of OsSAMS1 after M. oryzae infection A: transcriptome sequencing analysis of rice samples before and 12, 24, and 36 hours after M. oryzae infection showed that the relative expression level of OsSAMS1 was induced by M. oryzae infection; B: qRT-PCR analysis of the rice samples before and 12, 24, 48, and 72 hours after M. oryzae infection showed that the relative expression level of OsSAMS1 was increased and reached the highest level at 24 hours after infection compared to the control."

Fig. 2

Relative expression patterns of OsSAMS1 The relative expression levels of OsSAMS1 in roots, stems, and leaves of two-week old, four-week old and six-week old seedlings, spikelets of 0.5-1.0 cm, 1-3 cm, 3-5 cm, and 5-10 cm length, germinating and mature seeds and callus were analyzed by qRT-PCR. The error bar represents the standard deviation (SD) of the value from three independent biological samples."

Fig. 3

Determination of ossams1-1 (A) and ossams1-2 (B) knockout transgenic lines"

Fig. 4

Morphological phenotypes of ZH11, ossams1-1, and ossams1-2 The phenotypes of ZH11, ossams1-1, and ossams1-2 at filling stage were observed; bar: 10 cm."

Table 2

Comparison of the main agronomic traits between knockout lines and parents"

性状Trait ZH11 ossams1-1 ossams1-2
株高 Plant height (cm) 99.82 ± 1.86 85.94 ± 1.76** 86.12 ± 1.92**
穗长 Panicle length (cm) 23.15 ± 1.32 18.85 ± 1.41* 18.96 ± 1.31*
有效穗数 Number of effective panicle 9.20 ± 1.04 7.84 ± 1.02* 8.11 ± 1.01*
每穗颖花数 Spikelets per panicle 144.46 ± 4.26 122.26 ± 5.16* 120.16 ± 5.06*
结实率 Seed setting rate (%) 95.32 ± 1.16 96.12 ± 1.06 96.02 ± 1.32
千粒重 Thousand-grain weight (g) 26.62 ± 0.46 26.22 ± 0.52 26.82 ± 0.51
粒长 Grain length (mm) 7.92 ± 0.11 7.89 ± 0.12 7.88 ± 0.11
粒宽 Grain width (mm) 3.62 ± 0.08 3.68 ± 0.09 3.60 ± 0.06

Fig. 5

Compared with ZH11, ossams1-1 and ossams1-2 were more susceptible to M. oryzae A: the plants of ossams1-1 and ossams1-2 produced more diseased lesions compared to the ZH11 plants after inoculation with Guy11 using the spraying method; B: the analysis of the fungal biomass in the diseased leaves. *: P < 0.05, **: P < 0.01, Student’s t-test."

Fig. 6

Relative expression patterns of PR genes in ossams1-1, ossams1-2, and ZH11 A, B, C and D represent the expression changes of PR1a, PR5, PR6, and PR10 in ossams1-1, ossams1-2 and ZH11 after inoculation with Guy11. Asterisks represent significant differences relative to wild-type ZH11 plants (*: P < 0.05, **: P < 0.01, Student’s t-test)."

Fig. 7

Relative expression patterns of ethylene synthesis related genes in ossams1 mutants and the wild-type ZH11 after inoculation with M. oryzae A, B, C, and D represent the expression changes of OSACS1, OSACS2, OSACS4 and OSACS6, in ossams1 mutants and the wild-type ZH11 after inoculation with M. oryzae respectively (*: P < 0.05, **: P < 0.01, Student’s t-test)."

Fig. 8

Subcellular localization of OsSAMS1 The expression of OsSAMS1-GFP in N. benthamiana cells was observed by laser confocal microscopy. The results showed that OsSAMS1-GFP expressed in the nucleus, cytoplasm and cell membrane; bar: 20 μm."

Fig. 9

Phylogenetic analysis of OsSAMS1 in plants Blast analysis was used to search for the homologous proteins of OsSAMS1 in NCBI, RGAP, and TAIR protein database, and two homologous proteins encoded by LOC_Os01g18860 and LOC_ Os01g22010 in rice, two homologous proteins AtSAM1 and AtSAM2 in Arabidopsis, and the SAMS1 protein in maize, sorghum, panicum, and setaria were obtained. Then phylogenetic analysis was performed with MEGA7.0 software."

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