关键词: 蓝莓, 叶片, 抗逆性, 果实品质, 海拔

Abstract: Four cultivars of blueberry, i.e. Vaccinium ashei ‘Britewell’, V. ashei ‘Gardenblue’, V. corymbosum ‘Bluerain’, and V. corymbosum ‘Legacy’, were grown in different altitude regions, i.e. low altitude (800 m), mediate altitude (1100 m) and high altitude (2000 m) in Guizhou. And their relevant physiological indicators of leaves and fruits were determined. The results suggested that, physiologically, the MDA content and CAT activity of the four varieties showed a significant downward trend with increasing altitude, while the leaves’ REL, POD, SOD, and TC increased significantly with increasing altitude. When given a same elevation, the REL and MDA content of ‘Britewell’ leaves were the lowest among the four species, while its SOD activity appeared to be the highest in the three elevation zones. In terms of the quality of blueberry fruit, the VC content of ‘Legacy’ grown in high-altitude area performed the best, while that of ‘Britewell’ in high-altitude area ranked the lowest. As for low and mid-altitude areas, ‘Gardenblue’ had the highest VC content, and ‘Bluerain’ the lowest. The rank of anthocyanin content was as such: ‘Gardenblue’> ‘Britewell’> ‘Legacy’>‘Bluerain’; as for the average weight of blueberry fruit, the order was ‘Legacy’> ‘Britewell’ > ‘Gardenblue’ > ‘Bluerain’, which showed certain regularity; in low and mid-altitude areas, ‘Gardenblue’ produced the highest sugar-acid ratio out of the four varieties. And in high-altitude region, sugar-acid ratio of ‘Britewell’ appeared to be the highest. The above studies presented the resistance indexes and chlorophyll changes of the four blueberry varieties in regions of different altitudes in Guizhou, indicating that they were all equipped with certain stress resistance, that was, the adaptability against harsh environment, wherein, ‘Britewell’ was believed to had the best adaptability, with larger fruit, highest sugar-acid ratio in high altitude region, and the content of OPC as well as VC only following that of ‘Gardenblue’; the adaptability of ‘Britewell’ and ‘Legacy’ beats that of ‘Gardenblue’, whose fruit was smaller, with sugar-acid ratio ranking the highest in low and mid-altitude, the best palatability, and the highest VC and OPC content.

Key words: blueberry, leaf, stress resistance, fruit quality, altitude