Pear is a popular and commercially important fresh fruit, and its texture is related to the presence of sclereid formatted by parenchyma cell with lignification in vascular plants. Previous studies have demonstrated t...Pear is a popular and commercially important fresh fruit, and its texture is related to the presence of sclereid formatted by parenchyma cell with lignification in vascular plants. Previous studies have demonstrated that content of lignin may be regulated by cinnamoyl CoA reductase(CCR) in various plants. However, the function of CCR in pears remains very limited. In the present study, we isolated a cDNA encoding CCR(PpCCR, GenBank accession No. KF999958) and its promoter(proPpCCR) from Whangkeumbae pear to investigate the function of CCR in lignin biosynthesis. PpCCR-GFP expressed in rice mesophyll protoplast demonstrated that PpCCR-GFP was localized in the cytoplasm, indicating that CCR may function in cytoplasm without localization signals. In transgenic plants carrying PpCCR, we observed higher lignin content compared with that in wild type plants, further suggesting that PpCCR can affect the lignin contents through regulating lignin biosynthesis in Arabidopsis thaliana. More studies in other plants are needed to confirm our conclusion.展开更多
‘Shinseiki’ pear, a superior cultivars of Pyrus pyrifolia, was bred from a cross of ‘Nijisseiki’× ‘Chojuro’ in Japan. In China, many excellent pear cultivars have been released using ‘Shinseiki’ as a pare...‘Shinseiki’ pear, a superior cultivars of Pyrus pyrifolia, was bred from a cross of ‘Nijisseiki’× ‘Chojuro’ in Japan. In China, many excellent pear cultivars have been released using ‘Shinseiki’ as a parent. In this study, the S-genotypes of 13 progenies of ‘Shinseiki’ were identified by PCR-RFLP analysis, DNA sequencing and bioinformatic method. As a control, ‘Shinseiki’ was also included. PCR amplification showed that a common fragment of about 370 bp was generated in all the 13 cultivars. Restriction digestion analysis showed that PCR product amplified from ten cultivars ‘Huangguan’, ‘Yaqing’, ‘Bishanerhao’, ‘Xinya’, ‘Cuilv’, ‘Xizilv’, ‘Zhonglierhao’, ‘Zhongliyihao’, ‘Qingxiang’ and ‘Qinghua’ could be cut by S4-allele-specific endonuclease, and that from ‘Xinhang’, ‘Cuiguan’ and ‘Zaomeisu’ could be cut by S3-allele-specific endonuclease. DNA sequencing and bioinformatic analysis revealed that the undigested PCR fragment of ‘Huangguan’, ‘Cuiguan’, ‘Zaomeisu’, ‘Yaqing’, ‘Bishanerhao’, ‘Xinhang’, ‘Cuilv’, ‘Xizilv’, ‘Zhonglierhao’, ‘Zhongliyihao’, ‘Qingxiang’, ‘Xinya’ and ‘Qinghua’ was identical to S 16 , S5, S 35 , S 17 , S 16 , S1, S3, S1, S 31 , S 35 , S7, S 17 and S1, respectively. Consequently, the S-genotypes of 13 cultivars were as follows: ‘Huangguan’ （S4S 16 ）, ‘Yaqing’ （S4S 17 ）, ‘Xinhang’ （S1S3）, ‘Bishanerhao’ （S4S 16 ）, ‘Xinya’ （S4S 17 ）, ‘Cuilv’ （S3S4）, ‘Xizilv’ （S1S4）, ‘Zhonglierhao’ （S4S 31 ）, ‘Zhongliyihao’ （S4S 35 ）, ‘Zaomeisu’ （S3S 35 ）, ‘Cuiguan’ （S3S5）, ‘Qingxiang’ （S4S7） and ‘Qinghua’ （S1S4）.展开更多
基金Supported by the Earmarked Fund for China Agriculture Research System(CARS-2917)Hubei Innovation Center of Agricultural Science and Technology(2011-620-005003)
文摘Pear is a popular and commercially important fresh fruit, and its texture is related to the presence of sclereid formatted by parenchyma cell with lignification in vascular plants. Previous studies have demonstrated that content of lignin may be regulated by cinnamoyl CoA reductase(CCR) in various plants. However, the function of CCR in pears remains very limited. In the present study, we isolated a cDNA encoding CCR(PpCCR, GenBank accession No. KF999958) and its promoter(proPpCCR) from Whangkeumbae pear to investigate the function of CCR in lignin biosynthesis. PpCCR-GFP expressed in rice mesophyll protoplast demonstrated that PpCCR-GFP was localized in the cytoplasm, indicating that CCR may function in cytoplasm without localization signals. In transgenic plants carrying PpCCR, we observed higher lignin content compared with that in wild type plants, further suggesting that PpCCR can affect the lignin contents through regulating lignin biosynthesis in Arabidopsis thaliana. More studies in other plants are needed to confirm our conclusion.
文摘‘Shinseiki’ pear, a superior cultivars of Pyrus pyrifolia, was bred from a cross of ‘Nijisseiki’× ‘Chojuro’ in Japan. In China, many excellent pear cultivars have been released using ‘Shinseiki’ as a parent. In this study, the S-genotypes of 13 progenies of ‘Shinseiki’ were identified by PCR-RFLP analysis, DNA sequencing and bioinformatic method. As a control, ‘Shinseiki’ was also included. PCR amplification showed that a common fragment of about 370 bp was generated in all the 13 cultivars. Restriction digestion analysis showed that PCR product amplified from ten cultivars ‘Huangguan’, ‘Yaqing’, ‘Bishanerhao’, ‘Xinya’, ‘Cuilv’, ‘Xizilv’, ‘Zhonglierhao’, ‘Zhongliyihao’, ‘Qingxiang’ and ‘Qinghua’ could be cut by S4-allele-specific endonuclease, and that from ‘Xinhang’, ‘Cuiguan’ and ‘Zaomeisu’ could be cut by S3-allele-specific endonuclease. DNA sequencing and bioinformatic analysis revealed that the undigested PCR fragment of ‘Huangguan’, ‘Cuiguan’, ‘Zaomeisu’, ‘Yaqing’, ‘Bishanerhao’, ‘Xinhang’, ‘Cuilv’, ‘Xizilv’, ‘Zhonglierhao’, ‘Zhongliyihao’, ‘Qingxiang’, ‘Xinya’ and ‘Qinghua’ was identical to S 16 , S5, S 35 , S 17 , S 16 , S1, S3, S1, S 31 , S 35 , S7, S 17 and S1, respectively. Consequently, the S-genotypes of 13 cultivars were as follows: ‘Huangguan’ （S4S 16 ）, ‘Yaqing’ （S4S 17 ）, ‘Xinhang’ （S1S3）, ‘Bishanerhao’ （S4S 16 ）, ‘Xinya’ （S4S 17 ）, ‘Cuilv’ （S3S4）, ‘Xizilv’ （S1S4）, ‘Zhonglierhao’ （S4S 31 ）, ‘Zhongliyihao’ （S4S 35 ）, ‘Zaomeisu’ （S3S 35 ）, ‘Cuiguan’ （S3S5）, ‘Qingxiang’ （S4S7） and ‘Qinghua’ （S1S4）.
