| 1 | Differential regulation of the anthocyanin profile in purple kiwifruit(Actinidia species)显示文摘Anthocyanins are a group of secondary metabolites that colour fruit and flowers orange,red,purple or blue depending on a number of factors,such as the basic structure,co-pigmentation,metal ion complexation and vacuolar pH.The biosynthesis of anthocyanin is regulated at the transcriptional level by a group of transcription factors,the MYB–bHLH–WD40(MBW)complex.In this study,the purple colouration in several kiwifruit(Actinidia)species was identified and characterised as red cyanidin-based and blue delphinidin-based anthocyanins.The differential pigmentation in the skin and flesh can be attributed to the differential ratio of cyanidin and delphinidin derivatives accumulated in the total anthocyanin profile.The expression of anthocyanin biosynthetic genes chalcone synthase(CHS),flavonoid 3-O-glucosyltransferase(F3GT),flavonoid 3′-hydroxylase(F3′H)and flavonoid 3′5′-hydroxylase(F3′5′H)is crucial for anthocyanin accumulation.However,the balance of expression of the F3′H and F3′5′H genes appears responsible for the ratio of cyanidin and delphinidin derivatives,while a lack of CHS,F3GT and MYB110 expression is responsible for a lack of total anthocyanins.The transcriptional regulation of the F3′H and F3′5′H promoters by the R2R3 MYB transcription factor MYB110 is markedly different in tobacco transient assays.When kiwifruit MYB10 or MYB110 are over-expressed in Actinidia chinensis both cyanidin-based and delphinidin-based anthocyanins are elevated,but F3′H and F3′5′H genes are not strongly correlated with MYB expression.These results suggest that the core kiwifruit anthocyanin pathway genes are dependent on characterised MYB transcription factors,while other regulatory proteins are more directly responsible for the expression of the F3′H and F3′5′H genes. | Yongyan Peng Kui Lin-Wang Janine M.Cooney Tianchi Wang Richard V.Espley Andrew C.Allan | 2019 | Horticulture Research2019，6，1： | 6 |
| 3 | 专家系统技术在林业上的应用显示文摘1月份的软件专栏,讨论了决策支持系统(DSS),它是用来帮助决策者作出决定的一种软件。由于信息库和模型系统相结合,DSS 能预测特殊管理活动的效果。用逻辑判断方法处理决策过程,决策者可获得一个特殊问题的更换方案。方案的选择取决于决策者的专业知识——个人知识库。但是,任何学科总的知识库是不断增加的。在很多情况下,由于某一学科知识的迅速增长,决策者甚至能跟得上形势的专家要作出最精确的决策是困难的,而且很多林业决策的信息至少有部份是来自一个人的专业知识范围之外。通过借助计算机的功能,增强对信息的组织、存储、检索和分析,决策者能扩大他们的分析能力,包括他们的知识深度以及超出他们专业之外的思考信息。在人工智能的研究中,一种新的应用技术出现,它使计算机帮助决策成为可能。 | H.Michacl Rauscher Timothy M.cooney 张蕙 | 1989 | 广东林业科技1989，0，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员