Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2022, Vol. 43 ›› Issue (12): 2597-2605.DOI: 10.3969/j.issn.1000-2561.2022.12.022

• Agricultural Ecology & Environmental Protection • Previous Articles     Next Articles

Effects of Precipitation Pattern Change on the Growth Carbon and Nitrogen Metabolism of Alpinia oxyphylla During Dry Season

HU Wen1,2,3, ZHOU Xiaohui2,3, LI Qinfen2,3, CHENG Hanting2,3,*()   

  1. 1. College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China
    2. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences / Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Haikou, Hainan 571101, China
    3. Key Laboratory of Low Carbon Green Agriculture in Tropical China, Ministry of Agriculture and Rural Affairs, Haikou, Hainan 571101, China
  • Received:2022-02-16 Revised:2022-04-25 Online:2022-12-25 Published:2023-01-12
  • Contact: CHENG Hanting


Alpinia oxyphylla is one of the four southern medicines in China, and its cultivation under rubber forest has become the most important agroforestry mode in rubber plantation. The study previously found that insufficient precipitation is the main limiting factor for the growth and photosynthesis of A. oxyphylla during the dry season. However, our knowledge is still limited in understanding the response of A. oxyphylla to precipitation pattern change during the dry season. Three precipitation gradients including decreased precipitation (W-)10 mm/ month, natural precipitation (W) 25 mm/ month and increased precipitation (W+) 40 mm/ month, and set 5 days (5 d) and 10 days (10 d) of interval between precipitation were simulated in the study. The leaf water content in W- plant of 10 d was significantly increased by 3.63% compared with 5 d. In addition, we analyzed plant growth parameters, carbohydrate and N compound levels and the activity of key enzymes related to C and N metabolism through two factors experiment of precipitation and precipitation interval. The aboveground biomass and underground biomass of A. oxyphylla decreased with the decrease of precipitation. The total biomass of 5 d was significantly higher than that of 10 d at all precipitation levels (P<0.05). The plant growth was further inhibited by precipitation and extended precipitation interval. The decreased precipitation changed the activity of carbon metabolism enzymes, inhibited the AMY and INV activity, and promoted the SPS activity. However, this promoting effect became trivial with extended precipitation interval. The accumulation of non-structural carbohydrates (soluble sugar and starch) was promoted by decreased precipitation and activity change of C metabolic enzymes. The decreased precipitation lowered the total N content of A. oxyphylla leaves, and the total N content of W+ and W- in 5 d was significantly increased by 8.33% and 9.81% compared with that of 10 d. The N metabolic components changed in plant leaves with decreased precipitation. Meanwhile, the GS/GOGAT, NR and NiR activity increased with the decreased precipitation, which accelerated nitrate nitrogen (NO3-) reduction and ammonium (NH4+) assimilation. The NO3- and NH4+ in W plant in 5 d were significantly decreased by 57.54% and 152.98 compared with that of 10 d. Therefore, the change of precipitation pattern could affect the change of biomass carbon and nitrogen compounds and metabolic enzymes of the plant during the dry season. In summary, drought stress was adapted to ensure normal growth of A. oxyphylla through biomass allocation and C and N metabolism regulation.

Key words: carbohydrate, ammonium assimilation, ammonium assimilation, Alpinia oxyphylla, precipitation patterns

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