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Chinese Journal of Ecology ›› 2025, Vol. 44 ›› Issue (4): 1104-1113.doi: 10.13292/j.1000-4890.202504.027

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The impacts of exogenous IAA and 6-BA on biomass allocation and allometric growth relationships in stumping seedlings of Pinus yunnanensis.#br#

CHENG Sili1,2, GU Xuesha1,2, HU Zhaoliu1,2, TANG Guangpeng1,2, HE Bin3*, CHEN Lin1,2, CHEN Shi1,2, XU Yulan1,2, CAI Nianhui1,2*   

  1. (1Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of Education, Southwest Forestry University, Kunming 650224, China; 2Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China; 3Yunnan Communications Vocational and Technical College, Kunming 650500, China).

  • Online:2025-04-10 Published:2025-04-10

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Abstract: We investigated biomass allocation and allometric growth of Pinus yunnanensis seedlings in response to exogenous indole-3-acetic acid (IAA) and 6-benzylaminopurine (6-BA). Three levels of IAA (0, 150, 300 mg·L-1) and three levels of 6-BA (0, 100, 200 mg·L-1) were combined in pairs and total nine treatments were set up to measure biomass of P. yunnanensis seedlings under different combinations of IAA and 6-BA treatments. The standard major axis (SMA) regression analyses were employed to explore the allometric growth relationships among different organs of P. yunnanensis seedlings under different treatments. The results showed that different treatments did not affect biomass accumulation and allocation among various organs of P. yunnanensis seedlings compared to the control (J1) (P>0.05). High concentration IAA and medium concentration 6-BA (J8) treatment favored biomass accumulation in roots and stems. High concentration IAA and 6-BA treatment (J9) prioritized resource allocation to stems. Medium concentration IAA treatment (J4 and J6) prioritized resource allocation to leaves. The impact of different treatments on root, stem and leaf biomass varied in order: combined IAA and 6-BA treatment > single 6-BA treatment > single IAA treatment. The impact of different treatments on aboveground and total biomass accumulation followed an order: single IAA treatment > combined IAA and 6-BA treatment > single 6-BA treatment. The allometric growth relationships among different organs varied under different treatments. Among them, J6, J7, and J9 treatments generally showed allometric growth, while other treatments mostly exhibited isometric growth. Our results suggested that the combined application of IAA and 6-BA was more effective than the single application. The allometric growth relationships varied under different treatments, exhibiting both isometric and allometric growth, which reflected the different growth strategies of P. yunnanensis seedlings.


Key words: Pinus yunnanensis, exogenous hormone, biomass investment and allocation, surface equation, allometric relationship