Production of Two Elite Glutinous Rice Varieties by Editing Wx Gene

doi:10.1016/j.rsci.2018.04.007

摘要/Abstract

关键词: amylose, CRISPR, Cas9, rice, starch, Wx

. [J]. Rice Science, 2019, 26(2): 118-124.

图/表 6

Table 1 Primers used in this study

Primer	Sequence (5′-3′)	Purpose
T1-F	GGCACACGTCCCAGCTCGCCACCT	Vector construction
T1-R	AAACAGGTGGCGAGCTGGGACGTG	Vector construction
T2-F	GCCGTCCGTCGTCGTGTACGCCAC	Vector construction
T2-R	AAACGTGGCGTACACGACGACGGA	Vector construction
Wx-F	TAGCCACCCAAGAAACT	Amplification of the fragments across sgRNAs
Wx-R	CTACCTCAGCCACAACG	Amplification of the fragments across sgRNAs
hyg283-F	TCCGGAAGTGCTTGACATT	Vector deletion (HPTII)
hyg283-R	GTCGTCCATCACAGTTTGC	Vector deletion (HPTII)
Cas9-F	TTCGACCAGTCCAAGAACGG	Vector deletion (Cas9) (Wang et al, 2016)
Cas9-R	CTTGACCTTGGTGAGCTCGT	Vector deletion (Cas9) (Wang et al, 2016)

Fig. 1 Schematic diagrams of the Wx and CRISPR/Cas9 vector.A, Overview of the Wx gene structure and target sites for sgRNAs (T1 and T2). Exons and introns in Wx gene are depicted by orange rectangles and white rectangles, respectively. The target sequences of sgRNAs are shown at the top of the gene structure in red. B, The structure of the Wx gene editing system. T1 and T2 are driven by U3 and U6a promoters, respectively. RB, Right border; LB, Left border; Cas9, CRISPR associated protein 9 gene; HPTII, Hygromycin-resistance gene.

Fig. 2 CRISPR/Cas9-induced mutations in the Wx gene.A, PCR analysis of HPTII in T0 lines (part of the picture). M, DNA marker; 1, wx-SK118-1; 2, wx-SK118-2; 3, wx-SK118-3; 4, wx-HD5-1; 5, wx-HD5-2; 6, wx-HD5-3; 7, Positive control of pYLCRISPR/Cas9-MH-Wx; 8, Negative control of SK118; 9, Negative control of HD5; 10, Negative control of ddH2O. B, Polymerase chain reaction assays of Wx in T0 lines. M, DNA marker; 1, wx-SK118-1; 2, wx-SK118-2; 3, wx-SK118-3; 4, wx-HD5-1; 5, wx-HD5-2; 6, wx-HD5-3; 7, Control of SK118; 8, Control of HD5. C, Sequencing results of T0 mutant lines. sgRNA is shown in red letter; Insertion sequence is shown in green letter; Deletion sequence is shown by dashed line.

Table 2 Segregation of transgene-free rice in T1 generation.

Line	No. of examined plants	No. of transgene-free plants
wx-SK118-1	10	3
wx-SK118-2	23	5
wx-SK118-3	85	10
wx-HD5-1	53	6
wx-HD5-2	135	17
wx-HD5-3	47	13

Fig. 3 Phenotype of the Wx mutants.A, Intact polished rice. B, Grains stained with iodine solution. C, Amylose content of Wx mutants. Data represent Mean ± SD (n = 3). **, Significant at the 0.01 level by the t-test.

Fig. 4 Cross-sections of endosperm in rice.

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