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광도와 Frankia 질소고정균 및 Alpova diplophloeus 외생균근균의 (外生菌根菌) 접종이 루브라 오리나무 묘목내 (苗木內) 삼자공생관계 발달에 미치는 영향
구창덕(Chang Duck Koo),Randy Molina(Randy Molina),Steven Miller(Steven Miller) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.3
To investigate the effect of low light intensities and the inoculation of Frankia and/or Alpova diplophloeus on the symbioses development and their host growth, red alder(Alnus rubra Bong.) seedlings were grown in an air - filtered walk - in growth chamber with either N₂ - fixing Frankia inoculation or N - fertilization and live or dead spore inoculation of the ectomycorrhizal fungus: A. diplophloeus(Zeller & Dodge) Trappe & Smith. When they were 20 weeks old, the seedlings were grown under three levels of light intensities of 680, 320 and 220μ㏖/㎡/s PPFD(photosynthetic photon flux density) for three weeks. PPFD of 220 significantly decreased the development of A. aiplophloeus mycorrhizae and nodules, the rates of N₂ - fixation and CO₂ exchange, and the growth of tile seedlings. PPFD 320 significantly decreased the CO₂ exchange rate only. Frankia inoculation significantly increased mycorrhiza formation and seedling growth. Alpoaa inoculation significantly increased seedling growth but not nodule development and N₂- fixation. None of the symbionts affected CO₂ exchange rates. Frankia was more critical for seedling growth and mycorrhizal development than the mycorrhizal fungus for seedling growth and nodule development.
외생균근이 수분결핍된 루브라 오리나무 묘목의 생리활동에 미치는 영향
구창덕,Molina, Randy,Miller, Steven L. 한국임학회 2000 한국산림과학회지 Vol.89 No.4
Red alder (Alnus rubra Bong.) seedlings inoculated with Frankia pure cultures were grown in a walk-in growth chamber for sixteen weeks. Half were inoculated with the spores of the ectomycorrhizal fungus Alpova diplophloeus (Zeller & Dodge) Trappe & Smith. The mycorrhizal seedlings were significantly larger than nonmycorrhizal plants in diameter, and nodule and shoot dry weight by 6 to 16% when their heights were very similar. The mycorrhizal effects on water relations of red alder seedlings were explored in a 30 hours water stress. Mycorrhizal and nonmycorrhizal seedlings did not significantly differ in leaf water potentials, CO₂ exchange rates or N₂-fixation rates during the drought. Our results suggests that A. diplophloeus mycorrhizas increased red alder seedling growth under well-watered conditions but do not affect water relations of the plant under water-stress.
Effect of Water Stress on Ectomycorrhizal Development and Growth of Alnus rubra Seedlings
Koo, Chang-Duck,Molina, Randy,Miller, Steven L.,Trappe, James M. 한국토양비료학회 2001 한국토양비료학회지 Vol.34 No.4
수분 스트레스가 루브라오리나무(Alnus rubra) 묘목의 균근(Alpova diplophloeus) 발달과 생장에 미치는 영향을 조사하였다. 5일 주기의 수분 스트레스를 10주 동안 처리한 결과 A. diplophloeus 균근의 형성, 묘목의 생리활동 및 생장이 감소하였다. A. diplophloeus 균근균이 접종된 묘목과 접종되지 않은 묘목은 수분 스트레스에 관계없이 생리활동이나 생장에서 차이가 없었다. 질소고정활동은 탄소동화작용보다 수분스트레스에 덜 민감하였다. 이 결과는 수분스트레스 상태에서 A. diplophloeus 균근은 오리나무의 적응도(fitness)에 기여하지 못함을 의미한다. The effects of water stress on the development of Alpova dipiophloeus ectomycorrhizas and on the growth of nodulated Alnus rubra Bong seedlings were investigated. Five-day cyclic water stress significantly decreased the ectomycorrhizal development and the seedling growth. However, A. diplophloeus inoculated seedlings did not significantly differ from the non-inoculated seedlings in the growth and physiological activities under both well watered and water stressed conditions. $N_2$-fixation was less sensitive than $CO_2$ fixation to water stress. We conclude that under water stress conditions A. diplophloeus mycorrhizas do not contribute to the fitness of red alder seedlings.