Subjects: Biology >> Botany >> Applied botany submitted time 2024-04-17 Cooperative journals: 《广西植物》
Abstract： To investigate and clarify the aroma components and contents of different varieties of Guizhou rabbit-eye blueberries, this study used headspace solid phase microextraction and gas chromatography-mass spectrometry (HS-SPME/GC-MS) methods to analyze the aroma component content of the main rabbit-eye blueberry grown in Guizhou, such as ‘Coastal’, ‘Britewell’, ‘Climax’, ‘Tifblue’ and ‘Powderblue’. The results were as follows: (1) A total of 46 aroma components in 7 categories were detected in the 5 varieties, including 8 types of alcohols, 13 types of terpens, 9 types of benzenes, 3 types of aldehydes, 5 types of esters, 4 types of alkanes, and 4 types of others. (2) ‘Climax’ has the most aroma components with 33, while ‘Powderblue’ has the least with only 24; among the aroma components of each variety, aldehydes account for the largest proportion, followed by benzenes, with ‘Britewell’ having the highest content of aldehydes (59.32%) and ‘Powderblue’ the highest content of benzenes (42.58%). (3) Among the five varieties, ‘Coastal’ has the highest total content of aroma components, at 172 872.20 ng‧g-1, followed by ‘Britewell’ at 162 200.87 ng‧g-1; ‘Coastal’ and ‘Powderblue’ have lower total aroma component contents, at 91 284.45 ng‧g-1 and 97 511.10 ng‧g-1, respectively. The significant differences in aroma components and contents among these five rabbit-eye blueberry varieties provide an important basis for the selection of blueberry varieties and the choice of raw materials.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-18 Cooperative journals: 《广西植物》
Abstract： Camellia kweichowensis is a rare 5-locular capsule-bearing representative species of the section Camellia with biological importance and economic value. This study explored the reasons for its endangered status and effective ways to conserve and utilize resources. In this study, by combining the sample investigation and actual measurement methods, the analysis of population age structure and survivability, we studied the quantitative characteristics of population structure dynamics and future development trend. The results were as follows: (1) The primary vegetation of C. kweichowensis had typical characteristics of subtropical humid evergreen broad-leaved forests. While the mixed evergreen and deciduous broad-leaved forest accounted for the main stand, the coniferous broad-leaved mixed forest of Pinus armandii + Betula luminifera + Liquidambar formosana + Nyssa sinensis + Camellia sp. + Eurya sp. + Schima sp. was common. (2) The growth population of C. kweichowensis dominated the growth structure. The points were mainly concentrated in the small and medium tree stages, and the sum of the proportion constituted 73.02% of the overall population. Deevey-Ⅱ type characteristic of the population survival curve was obvious, the life expectancy of C. kweichowensis was the maximum at the seedling stage. The change trend of mortality and the vanishing curves of the same plot were approximately the same. The quantitative dynamic analysis indicated that the three plots had abundant seedling pools, but were sensitive to the disturbance outside the habitat. The probability of surviving to Ⅶ age-class dropped significantly to 36.17%. On the whole, the population structure showed the characteristics of “growth in the early stage and decline in the late stage of Ⅳ age-class”. (3) The time-series forecast analysis indicated that after the growth period of 2-, 4-, 6-, 8-, and 10-diameter scales, the C. kweichowensis population dynamics tilted toward the succession of middle trees (Ⅴ-Ⅶ age-class), big trees (Ⅷ-Ⅹ age-class), and aged trees (Ⅺ-ⅩⅢ age-class). In conclusion, due to the limited habitat resources and space, intraspecific and interspecific competition intensifies, which reduces the survival rate of population seedlings and the number of young, and increased the mortality of adult plants caused by human predatory logging. As a result, the population renewal and diffusion are hindered, the distribution area is narrow, and the species tend to be endangered.
Hits
Hits
Downloads
Comment