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Acta Horticulturae Sinica ›› 2024, Vol. 51 ›› Issue (11): 2620-2632.doi: 10.16420/j.issn.0513-353x.2023-0413

• Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Carbon Pool Strength on Plant Growth and Potassium Uptake of Tomato Intercropped with Potato-Onion

LU Jianzeng, ZHOU Liyan, HUANG Xinyi, WU Fengzhi, GAO Danmei*()   

  1. College of Horticulture and Landscape Architecture,Northeast Agricultural University,Harbin 150030,China
  • Received:2024-06-21 Revised:2024-09-05 Online:2024-12-12 Published:2024-11-25
  • Contact: GAO Danmei

Abstract:

A pot experiment was conducted using tomato(Solanum lycopersicum L.)and potato-onion (Allium cepa L. var. aggregatum G. Don)in itercropping system to study the effects of shading(25%,50%)defoliation(25%,50%)and adjusting the size of planted tomato seedlings(tomato seedlings with two cotyledons or with two leaves planted with potato-onion)on carbon pool strength of tomato. Shading and defoliation treatments were found to decrease tomato growth while enhancing the growth of potato-onions. Interestingly,reducing the individual differences between tomato and potato-onion plants promoted the growth of both two plants. Reduction of tomato carbon pool strength reduced abundance of the arbuscular and hypha infection rate of tomato and potato-onion,but increased the abundance of vesicular. The potassium concentration in leaves and roots of potato-onion and the potassium concentration in leaves tomato were decreased,but increasing in roots of tomato instead after defoliation and adjusting the size of plant seedlings. Moreover,the rising concentration of potassium in leaves and roots of the tomato and potato-onion were respectively observed in shading 50% and 25% treatment. Shading and transplanting smaller tomato seedlings did not affect the available potassium content in the soil for potato-onions. Conversely,defoliation and transplanting smaller tomato seedlings reduced the available potassium in the soil for tomato,and weakened the tomato carbon pool strength can lead to a decrease in soluble sugar content in both plants. Overall,the reduction of carbon pool strength in tomato decreased to promoting effects of potato-onion on tomato plant growth,and reduced the role of arbuscular mycorrhizal fungi in the intercropping benifits between potato-onion and tomato system.

Key words: tomato, companion, potato-onion, carbon pool strength, arbuscular mycorrhizal fungi