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RISS 인기검색어
- 검색키워드
- 저자 : Chandrasekaran Umashankar (검색결과 3 건)
- 무료
- 기관 내 무료
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Influence of severe drought on mineral nutrient status in eastern white pine (Pinus strobus L)
Chandrasekaran Umashankar,변시연,김근효,허우진,한아름,이영상,김현석 한국산림과학회 2023 Forest Science And Technology Vol.19 No.3
The photochemical process of photosynthesis is significantly influenced by the availability of nutrients. The purpose of this research is to ascertain how photosynthetic pigment function is affected by nutrient elemental changes caused by severe drought stress. Using elemental analysis, we looked at the changes in mineral nutrient composition in eastern white pine (Pinus strobus L) seedlings 32 days after drought treatment. According to our findings, severe drought resulted in a significant and non-significant decrease in the contents of Chl “b and a”, respectively. The elemental composition of iron (Fe), zinc (Zn), magnesium (Mg), potas- sium (K), phosphorus (P) and nitrogen (N) was measured. After severe drought treatment, leaf nutrient status showed a significant decline in total N (control-1.57 ± 0.1; drought- 0.65 ± 0.07), P (control-959.4 ± 17; drought-645 ± 46), Mg (control-1030.4 ± 33; drought- 750.7 ± 76), and K (control-3062.5 ± 32; drought-1853.3 ± 198), with a non-significant decrease in leaf Fe (control-120.3 ± 20; drought-98.9 ± 28) and increase in leaf Zn (control-33.49 ± 2; drought-39.05 ± 4). A positive correlation was found between the content of Fe, P, Mg, K, and N in leaf Chl “b”, but only a positive correlation was found between the content of Zn in leaf Chl “a” during severe drought. During severe drought, nutrient reallocation has a sig- nificant impact on leaf chlorophyll levels, as evidenced by this correlation.
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Long-term drought modifies carbon allocation and abscisic acid levels in five forest tree species
Chandrasekaran Umashankar,Kim Kunhyo,Byeon Siyeon,Huh Woojin,Han Ah Reum,Lee Young-Sang,김현석 한국생태학회 2023 Journal of Ecology and Environment Vol.47 No.4
Background: This study analyzed the drought responses of five forest tree species grown in Korean peninsula, Korean fir Abies koreana (Ak), eastern white pine Pinus strobus (Ps), keyaki Zelkova serrata (Zs), tulip tree Liriodendron tulipifera (Lt), and Japanese elm Ulmus japonica (Uj). Physiological (chlorophyll, root collar diameter [RCD]) and biochemical responses (non-structural carbohydrates, proline, lipid peroxidase and abscisic acid [ABA]) of the plants grown under mild (MD) and severe drought (SD) were compared. Results: In this study, three soil moisture regimes: control (100% precipitation), MD (60% reduction in precipitation) and SD (20% reduction in precipitation) were applied. Soil moisture content showed high water content in control site compared to MD and SD. A decline in RCD was found for Korean fir, keyaki, and tulip plants, with eastern white pine and Japanese elm showing no significant decline to the prolonged drought exposure (both MD and SD). Total chlorophyll showed a significant decline in Korean fir and tulip, with the sugar levels indicating a significant increase in Korean fir and keyaki species under SD compared to control plants. Non-significant decline in sugar level was noted for eastern white pine and Japanese elm. High accumulation of ABA, malondealdehyde and proline was noted in Korean fir, tulip, and keyaki under SD compared to control. Signs of tree mortality was only observed in Korean fir under MD (38%) and SD (43%). Conclusions: The observed findings indicate the drought responses of five tree species. The majority of the morpho-physiological (especially mortality) and biochemical variables assessed in our study indicate superior long-term drought resistance of Ps and Uj compared to the highly sensitive Ak, and moderately sensitive Lt and Zs. The results provided will help species selection for afforestation programs and establishment of sustainable forests, especially of drought-tolerant species, under increased frequency and intensity of spring and summer droughts.
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Genome-wide analysis of the Dof transcription factors in castor bean (Ricinus communis L.)
Zhengwei Jin,Aizhong Liu,Umashankar Chandrasekaran 한국유전학회 2014 Genes & Genomics Vol.36 No.4
DNA binding with one finger (Dof) transcriptionfactors are unique in plants, characteristically composedof a Dof domain in structure, functionally involvedin mediating many processes of plant growth and development. In this study, we report a genome-wide analysisfor Dof gene family in castor bean (Ricinus communis L.,Euphorbiaceae) genome. In total, 21 RcDof genes wereidentified and their constructional characterization, classesand phylogenetic relationships were documented. Theexpression profiles of the 21 RcDof genes among differenttissues were inspected using the high throughput RNA-Seqdata. Finally, SqRT-PCR analysis was performed to test thetranscriptional responses of the 21 RcDof genes to abscisicacid (ABA) and/or gibberellic acid (GA) signals, resultingin the identification of 18 RcDof genes responsive to ABAand/or GA signals. Thus, this study would provide basicinformation in understanding the molecular basis of theRcDof family and their potential function in regulating thegrowth and development of castor bean.
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