Stable isotope and photosynthetic response of tea grown under different temperature and light conditions. (30th January 2022)

• Record Type: Journal Article
• Authors: Xia, Wei; Li, Chunlin; Nie, Jing; Shao, Shengzhi; Rogers, Karyne M.; Zhang, Yongzhi; Li, Zuguang; Yuan, Yuwei
• Is Part Of: Food chemistry. Volume 368(2022)
• Publication Date: 2022-01-30
• Subjects: Tea (Camellia sinensis) -- Stable isotopes -- Temperature -- Light intensity -- Photosynthesis; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2021.130771
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Different climate conditions cause predictable stable isotope trends in tea. Isotopes of tea leaves change according to temperature and light intensity. Different correlations exist between isotopes and leaf photosynthetic parameters. Abstract: The stable isotope and photosynthesis response of tea ( Camellia sinensis ) is determined under different light and temperature conditions. The results showed that isotopes of young tea leaves were more enriched with increasing light intensity (31 ~ 411 µmol m −2 ∙s −1 ). However, the value of δ 13 C and δ 15 N seemed depleted, while δ 2 H and δ 18 O became enriched as temperature increasing from 15 to 35 °C. Significant isotope differences were found in tea leaves harvested between early growth (0 ~ 10 days) and later growth (10 ~ 21 days) periods ( p < 0.05). Pearson's correlation showed a negative correlation between isotopes ( δ 13 C, δ 15 N and δ 2 H) and photosynthetic parameters (EVAP and CI) ranging from 0.497 to 0.872, under 25 °C/203 µmol m −2 ∙s −1 . But δ 18 O had a weak correlation with all photosynthetic parameters under the same conditions. These distinctive correlations between isotopes and photosynthetic parameters provide new insights which could be used to predict tea isotope responses arising from subtle seasonal or climate change conditions.