Proline and Oxidative Metabolism in Young Pecan Trees Associated with Sulphate Accumulation
PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY(2022)
摘要
Pecan [Carya illinoinensis (Wangenh.) K. Koch.] is a deciduous tree whose fruits (nuts) are of high economic value and offer excellent nutritional benefits. However, soils high in sulphates can limit its growth and development. Working with 5-year-old trees of 'Western Schley' pecan grown in soils high in sulphates, the levels of pro line and oxidative metabolism were recorded in the leaflets. Results showed that different levels of visible leaflet damage ('sufficiency', 'low', 'moderate' or 'severe') were associated with different levels of leaflet sulphates (mg kg(-1)): 'sufficiency' (<= 40), 'low' (41-60), 'moderate' (61-80) and 'severe' (80-100). 'Severe' sulphate damage was associated with significant reductions in chlorophyll (TChl) (17.04 mu g g-1), relative water content (RWC) (50%) and leaf area (LA), and with increases in the concentrations of total carotenoids (TC) and proline (Prl). Increases were also observed in the activities of the oxidative metabolism enzymes: superoxide dismutase (SOD) (1.82 units min(-1) g(-1)), catalase (CAT) (2.86 mu mol H2O2 min(-1) g(-1)) and antioxidant capacity (AC) (87% DPPH inhibition). However, guaiacol peroxidase (GP) showed a reduction (2.97 nmol GSH min(-1) g(-1)). An inverse relationship was found between the sulphate concentration in the leaflets with respect to the evaluated parameters of TChl, TC, RWC, LA, AC, and GP. Proline synthesis and antioxidant enzymatic activity indicate salt stress in pecan leaflets in orchards irrigated with deep-well water high in sulphates.
更多查看译文
关键词
Carya illinoinensis,catalase,guaiacol peroxidase,salt stress,photosynthetic pigments,superoxide dismutase
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要