信阳10号茶树芽期对低温胁迫的生理响应

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中图分类号：S571.1 文献标识号：A 文章编号：1001-4942（2025）08-0051-06

AbstractTo investigate the physiological response characteristics of new shoot leaves from diferent tea tree varieties to low-temperature stress during sprouting period，a controlled low-temperature simulation experiment wasconducted using the cultivar Xinyang 1O as test material and Fuding Dabaicha as control. The temperature regime was designed as 25°C （normal temperature）→0 C （low-temperature stress） for 24 hours 25°C （recovery phase） for 48 hours. The changes of the superoxide dismutase （SOD），catalase （CAT） and glutathione peroxidase （GSH-PX）activities，the contents of osmotic adjustment substances including soluble sugar，soluble protein and free proline，and the malondialdehyde （MDA） content in new shoot leaves during low-temperature stress and recovery phase were analyzed.The results revealed that during the temperature regime of recovery for 48 hours after 0% stress for 24 hours， the SOD activity，and the soluble sugar，free proline and MDA contents in new shoot leaves of the two tea tree cultivars increased consistently，while CAT activity initially decreased and subsequently rebounded.The change trend of GSH-PX activity and soluble protein content were different between the two cultivars，among which，those of Fuding Dabaicha declined steadily，while in Xinyang 1O，the GSH-PX activity decreased initiallyand then increased，whereas the soluble protein content exhibited an initial rise follwed by a decline.In conclusion，significant differences were found in SOD activity，soluble protein and soluble sugar contents between the two cultivars after low-temperature stress， and those of Xinyang 1O displayed markedly higher compared with Fuding Dabaicha.These findings indicated that Xinyang 10 possessed superior physiological adaptability and recovery capacity when response to low-temperature stress.

KeywordsTea tree; New shoot leaves； Late-spring cold; Low-temperature stress； Antioxidant en·zymes ； Osmotic adjustment substances

低温胁迫是植物栽培中常遇到的一种自然灾害，植株生长初期即萌发期和幼苗期对低温胁迫最为敏感。（剩余8375字）