Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy bega...Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy began, and then increased to the highest value before bud sprouting. The lowest value of GA 1/3 , 358 7 ng·g -1 FW, was observed 21 days after leaf falling, whereas ABA was the highest, 201 5 ng g -1 FW. Thereafter, ABA decreased and GA 1/3 increased with the advent of bud sprouting. Ratios of GA/iPA and iPA/ABA decreased first and then increased from dormancy to sprouting with minor change range compared with GA 1/3 , iPA and ABA. This demonstrated that dormancy break was closely related to hormone change, concurrent with starch degradation and increase in soluble sugars.展开更多
采用气相色谱-离子迁移谱(gas chromatography-ion mobility spectrometry,GC-IMS)技术研究8个产区香椿挥发性成分差异。共鉴定出56种化合物,醇类和醛类的相对含量较高。基于化学计量学主成分分析和偏最小二乘判别分析(partial least sq...采用气相色谱-离子迁移谱(gas chromatography-ion mobility spectrometry,GC-IMS)技术研究8个产区香椿挥发性成分差异。共鉴定出56种化合物,醇类和醛类的相对含量较高。基于化学计量学主成分分析和偏最小二乘判别分析(partial least squares-discriminant analysis,PLS-DA)可以很好区分8个产区香椿样品。基于PLS-DA模型的变量投影重要性(variable importance in projection,VIP)得分对8个产区香椿挥发性有机化合物进行判别分析,筛选出12种(VIP>1)标志挥发性化合物,其中(E)-2-己烯醛-D、乙酸乙酯-D、苯酚、糠醛、苯乙醇是主要的差异代谢物。不同产区香椿挥发性化合物存在较大差异。GC-IMS可以实现对不同产区香椿挥发性化合物的差异化快速分析,为香椿挥发性香气差异研究提供有益依据。展开更多
文摘Contents of carbohydrates and endogenous hormones from dormancy to sprouting of Toona sinensis buds were measured. Dynamic changes of GA 1/3 , iPA and ABA were detected. GA 1/3 and iPA decreased when the dormancy began, and then increased to the highest value before bud sprouting. The lowest value of GA 1/3 , 358 7 ng·g -1 FW, was observed 21 days after leaf falling, whereas ABA was the highest, 201 5 ng g -1 FW. Thereafter, ABA decreased and GA 1/3 increased with the advent of bud sprouting. Ratios of GA/iPA and iPA/ABA decreased first and then increased from dormancy to sprouting with minor change range compared with GA 1/3 , iPA and ABA. This demonstrated that dormancy break was closely related to hormone change, concurrent with starch degradation and increase in soluble sugars.
文摘采用气相色谱-离子迁移谱(gas chromatography-ion mobility spectrometry,GC-IMS)技术研究8个产区香椿挥发性成分差异。共鉴定出56种化合物,醇类和醛类的相对含量较高。基于化学计量学主成分分析和偏最小二乘判别分析(partial least squares-discriminant analysis,PLS-DA)可以很好区分8个产区香椿样品。基于PLS-DA模型的变量投影重要性(variable importance in projection,VIP)得分对8个产区香椿挥发性有机化合物进行判别分析,筛选出12种(VIP>1)标志挥发性化合物,其中(E)-2-己烯醛-D、乙酸乙酯-D、苯酚、糠醛、苯乙醇是主要的差异代谢物。不同产区香椿挥发性化合物存在较大差异。GC-IMS可以实现对不同产区香椿挥发性化合物的差异化快速分析,为香椿挥发性香气差异研究提供有益依据。
