This study was conducted to investigate the growth characteristics of the shoot and roots and to analyse the morphological characteristics of roots of waterlogging resistant and susceptible maize inbred lines. Six maize inbred lines were treated with waterlogging for 10 days at V3, and the degree of leaf senescence was evaluated for waterlogging resistance. As a result of waterlogging resistance evaluation, KS85 was the most damaged inbred line with 3.33 senescence leaves and 5.54 degree, and KS141 was the least damaged inbred line with 1.33 senescence leaves and 3 degree. At 20 days after treatment, the effect of waterlogging stress on the shoot dry matter accumulation of KS85 and KS141 were decreased by 86.1% and 77.0%, respectively, compared to the control. Similarly, root dry matter accumulation of KS85 and KS141 were decreased by 77.6% and 65.0%. As a result of SEM photographs of the nodal roots of the two maize inbred lines, the thickness of cortex of KS141 was thicker than that of KS85, and the distortion of the cortex was observed in KS85 at 20 days after waterlogging. It was concluded that the thickness of cortex was related to maize waterlogging resistance.

2013년 2월, 인천공항으로 수입된 미얀마산 삼채묘(Allium hookery)의 검역 과 정에서 뿌리혹선충(Meloidogyne spp.)이 검출되었다. 삼채묘에 형성된 뿌리혹은 다양한 형태로 나타나 여러 종이 동시에 감염된 복합감염으로 추정되었다. 따라서 뿌리혹의 형태별로 구분하여 표본을 제작하고, 뿌리혹선충 암컷 후부음문표피무 늬를 기준으로 종 동정을 시도하였다. 후부음문표피무늬의 형태에 따라 삼채묘에는 최소 5종의 뿌리혹선충이 감염된 것으로 밝혀졌으며 M. hapla, M. javanica, Meloidogyne sp.1, Meloidogyne sp.2, Meloidogyne sp.3으로 동정하였다. M. hapla와 M. javanica 그룹은 국내 분포종으 로 형태적 분류 형질이 뚜렷하게 나타났다. 나머지 3개 그룹은 국내 기록종과 대조 하여 형태적 형질이 다르게 나타나 국내 미기록종으로 추정되나, 동정을 위한 분류 형질이 복합적으로 나타나 정확한 동정이 이루어지지 않았다. 동정된 선충에 대한 사진 자료를 제공하며, 미동정된 뿌리혹선충의 정확한 동정을 위해 추가적인 연구 가 필요하다.

은행나무 줄기와 뿌리의 해부학적 관찰에서 횡단면의 가도관의 접선직경, 세포면적, 세포벽 두께 및 방사열에서 세포층수는 산성비의 pH가 낮아짐에 따라 감소되었다. 은행나무의 절선면에서 관찰한 줄기와 뿌리의 방추형 시원세포의 길이와 방사조직 시원세포의 길이는 산성비 처리에 의해 짧아지는 경향을 나타내었다. 곰솔의 줄기와 뿌리의 횡단면에서 가도관의 접선직경, 세포면적, 세포벽 두께 및 방사열에서 세포층수 역시 산성비 처리에 의해 pH가 낮아짐에 따라 감소되었

The toxic effects of aluminium (Al) on growth, chlorophyll content, δ-aminolevulinic acid dehydratase (ALAD) activity and anatomy of root and shoot were investigated in 7-day-old azuki bean (Vigna angularis) seedlings. Significant depressions in root elongation was observed in the low concentrations of Al (50, 100 ㎛) and increasing Al concentrations caused a sharp decline of root and shoot growth. The degree of inhibition was dependent upon Al supply. Exposure to 50 ㎛ Al or more inhibited root elongation within 1 day. In the 50 ㎛ Al treatments, a recovery of root growth was seen after 7 days exposure. In contrast, lateral root initials was little affected by Al exposure. Al toxicity symptoms and growth responses were more well developed in the roots than in the shoots. Analysis of Al localization in root cells by hematoxylin staining showed that Al entered root apices and accumulated in the epidermal and cortical cells immeadiately below the epidermis. There was a good positive correlation between the level of chlorophyll and ALAD activity. Increasing Al concentrations caused a decrease in total chlorophyll contents, accompanied by proportional changes in ALAD activity, suggesting a coordinated reduction of a photosynthetic machinery. Al exerted specific influence on the morphology of root and shoot. At higher concentrations of Al the roots induced drastic anatomical changes. The epidermal cells were disorganized or destructed while the cortical cells exhibited distortion of cell shape and/or disintegration. The diameter of root and transectional area of cortical cells decreased considerably with Al treatment. In the shoot Al also enhanced reduction of diameter of shoot and cell size. Gross anatomy of leaves treated with Al did not differ significantly from the controls, except for fewer and smaller chloroplast. Our results indicate that toxic effect of Al appear to be manifested primarily in roots and secondarily on shoots, and changes in root morphology are related to changes in the root growth patterns. Results are further discussed in relation to the findings in other plant species, and it is concluded that Al causes morphological, structural and, presumably, functional damage to the roots of the species investigated.