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Saccharina japonica is a common macroalga in sublittoral communities of cold seawater environments,and consequently may have highly effi cient ribulose-1,5-bisphosphate carboxylase/oxygenase(Rubisco)activity for carbon assimilation.In our study,we cloned the full-length Rubisco gene from S.japonica(SJ-rbc).It contained an open reading frame for a large subunit gene(SJ-rbcL)of 1 467 bp,a small subunit gene(SJ-rbcS)of 420 bp,and a SJ-rbcL /S intergenic spacer of 269 bp.The deduced peptides of SJ-rbcL and SJ-rbcS were 488 and 139 amino acids with theoretical molecular weights and isoelectric points of 53.97 kDa,5.81 and 15.84 kDa,4.71,respectively.After induction with 1 mmol/L isopropyl-β-Dthiogalactopyranoside for 5 h and purifi cation by Ni 2+ affi nity chromatography,electrophoresis and western blot detection demonstrated successful expression of the 55 kDa SJ-rbcL protein.Real-time quantitative PCR showed that the mRNA levels of SJ-rbcL in gametophytes increased when transferred into normal growth conditions and exhibited diurnal variations: increased expression during the day but suppressed expression at night.This observation implied that Rubisco played a role in normal gametophytic growth and development.In juvenile sporophytes,mRNA levels of SJ-rbcL,carbonic anhydrase,Calvin-BensonBassham cycle-related enzyme,and chloroplast light-harvesting protein were remarkably increased under continuous light irradiance.Similarly,expression of these genes was up-regulated under blue light irradiance at 350 μmol/(m 2·s).Our results indicate that long-term white light and short-term blue light irradiance enhances juvenile sporophytic growth by synergistic effects of various photosynthetic elements. 相似文献
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对海带(Saccharina japonica)转录组测序数据进行分析,从70 497条Unigenes中共检测到9 237个简单序列重复(SSR)位点,并对包含SSR序列的Unigenes进行功能注释。海带转录组中SSR的类型十分丰富,其中单核苷酸和三核苷酸重复SSR的数量最多,分别占SSR总数的40.9%和39.4%,其次为四核苷酸、二核苷酸、五核苷酸和六核苷酸重复,分别占SSR总数的9.8%,6.1%,3.1%和0.7%。SSR重复单元类型共有147种,其重复次数的范围为5~70次。功能注释发现约50%含有SSR的Unigenes获得了注释信息,并且大多数与已知蛋白有同源性。COG、GO功能分类结果均表明,大量含有SSR序列的基因与多种生物功能有关,其中与碳水化合物代谢及参与细胞组成相关的基因数量最多。本研究结果为深入开发功能性SSR标记奠定基础,也为开展海带分子标记辅助选育提供支持。 相似文献
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