규산염 종류와 적용방법에 따른 분화장미 ‘Apollo’와 ‘Remata’의 생육과 흰가루병 발생억제 효과

국문 초록 (Abstract)

규소는 식물의 필수원소에는 포함되지 않지만 곤충, 병원균, 건조, 중금속에 대한 저항성을 향상시켜 작물의 품질과 수량을 증가시킨다. 본 연구는 저면관수, 엽면살포, 저면관수+ 엽면살포 법으로 두 가지 규산염(K2SiO3, Na2SiO3) 처리가 분화장미 저 항성인 ‘Apollo’와 민감성인 ‘Remata’의 생장과 흰가루병 발생 에 미치는 영향을 조사하였다. 식물 재료는 장미 농가에서 재배 한 것으로 1차 적심이 완료된 분화 장미를 사용하였다. 정식 후 두 가지 규산염(K2SiO3, Na2SiO3)을 0, 50, 100mg·L-1 Si 의 농도로 엽면살포 또는 저면관수로 처리하였다. 재배 중의 EC는 1.6-1.8mS •cm-1로, pH는 5.8의 범위를 유지하도록 공 급양액과 공급량을 조절하였다. 환경제어가 가능한 온실에서 식물 을 재배하였고 흰가루병의 감염은 자연발생적으로 이루어졌다. 엽 면살포와 저면관수로 규소를 공급시 식물의 초장이 감소하였다. ‘Remata’ 품종에서 K2SiO3 100mg·L-1를 엽면살포로 공급한 처리에서 대조구(K2SiO3 0mg·L-1)에 비해 흰가루병의 발생이 감소하였다. 전반적으로 규소를 처리한 것에서 대조구에 비해 흰 가루병에 대한 내성이 향상되었다. 이러한 결과로 엽면살포법으로 K2SiO3를 공급하면 흰가루병에 대한 저항성을 가장 효과적으로 향상시킬 수 있을 것이라 판단된다.

다국어 초록 (Multilingual Abstract)

Silicon (Si) is still deemed to be a non-essential nutrient for the majority of plant species, although its uptake has been found to be beneficial for improving the resistance to insects, pathogens, drought and heavymetals, and for crop quality and yield. The effect of silicon from different sources (K2SiO3 and Na2SiO3) and their application methods (foliar application, subirrigation, and foliar application+ subirrigation) on the growth and development, and incidence of powdery mildew of potted Rosa hybrida ‘Apollo’(resistant) and ‘Remata’ (sensitive) was assessed. Plant materials, grown in a commercial rose farm in pots containing a commercial growing medium, consisted of rooted terminal cuttings of Rosa hybrida L. after first pinching. Silicon was mixed in a nutrient solution, at 0, 50, or 100 mg·L-1 Si as K2SiO3 or Na2SiO3, with EC of 1.6-1.8 mS·cm-1 and pH of 5.8, and was supplied through a subirrigation system or applied by a foliar application. Natural infestation of Sphaerotheca fuliginea on the plants grown in an environment controlled glasshouse was investigated. Both subirrigational supply and foliar application of Si decreased the plant height. Incidence of powdery mildew in Rosa hybrida ‘Remata’ by infection of Sphaerotheca fuliginea significantly decreased by 100 mg·L-1 K2SiO3 applied as foliar sprays as compared to that in the control (0 mg·L-1 K2SiO3). Overall the silicon-treated plant had more tolerance to powdery mildew than the control plant, and K2SiO3 applied as foliar sprays was the most effective.

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