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Rayhan Ahmed Shawon,강동현,류찬석,김동억,이시영,배종향,김연옥,구양규 경상대학교 농업생명과학연구원 2017 농업생명과학연구 Vol.51 No.6
Physiological responses and activities of antioxidative enzymes were investigated inpepper(Capsicum annuum) seedlings subjected to low temperature stress. The seedlings wereexposed to 7℃, 11℃, or 15℃ for 4 h during the early seedling stage of pepper plants. Theresults showed that plant height and chlorophyll content were unaffected by the treatments. Polyphenol content in seedlings exposed to 7℃ was higher than that at 11℃ and 15℃ for 2 h. After 3 h of treatment, the flavonoid content was higher in pepper seedlings exposed to 7℃than 11℃ and 15℃, which was slightly higher than that detected in the control. The H2O2content increased remarkably with increasing exposure time to low temperature(i.e., 7℃) ascompared to that at 11℃ and 15℃. The levels of antioxidant enzymes superoxidedismutase(SOD), catalase(CAT), ascorbate peroxidase(APX), and peroxidase(POD) fluctuated. These results provide basic information that can be utilized to maintain efficient temperaturein greenhouses for sustainable growth of pepper under severe low temperature conditions.
Rayhan Ahmed Shawon,Seo Yeon Ha,Tae Heon Lee,Thi Luyen Cao,Ho Cheol Kim,Jong Hyang Bae,Yang Gyu Ku 한국원예학회 2021 원예과학기술지 Vol.39 No.1
The objective of this study was to investigate the influence of a shade treatment on plant growth characteristics, bud break, and spear number of five asparagus (Asparagus officinalis L.) cultivars (Apollo, Atlas, Grande, UC157, and Walker Deluxe) and determine the most appropriate cultivar for cultivation in a shaded rain-shelter house. For the experiment, two-month-old seedlings were grown in the rain-shelter house with 30% shade using polyethylene film on the roof of the rain-shelter house, whereas the control plants were grown in a rain-shelter house without the additional layer of polyethylene. The shade treatment significantly increased the plant height, shoot number, shoot number per week, and bud number, but did not affect the mean number of days to bud break. The number of spears on asparagus grown in the shade was significantly higher than in the control. Under the shade treatment, Walker Deluxe and UC157 showed significantly higher shoot number and shoot number per week than the other cultivars. Compared to other cultivars, Walker Deluxe produced the highest bud number. In the control condition, Grande produced a higher number of shoots, shoots per week, buds, and roots than in the shade treatment. However, the shade treatment increased the ratio of spear numbers to bud numbers of Grande, resulting in a higher number of spears. Walker Deluxe with shade treatment had higher shoots, shoots per week, buds, roots, and spears than the control. These results suggest that Grande is more suited for growth in a rain-shelter house without shade treatment but that Walker Deluxe is more appropriate for cultivating in a rain-shelter house with 30% shade.
Rayhan Ahmed Shawon,강백송,김호철,이상규,김성겸,이희주,배종향,구양규 한국자원식물학회 2018 한국자원식물학회지 Vol.31 No.6
Chinese cabbage grown during autumn season is confronted with drought conditions for a certain period,especially during the early growth stage. In this study, we investigated the effects of drought stress on plant growthcharacteristics, as well as free amino acid, carotenoid, and proline in Chinese cabbage. Chinese cabbage seeds (Bulam Plus)were germinated, and all the seedlings were transplanted into plastic containers (28 ㎝ diameter × 22 ㎝ high) containing acommercial growth medium. The soil water content was measured and maintained at 10% for the drought-stressed plantsand at 30% for the control plants, for three weeks. The results revealed that plant growth parameters were lower in thedrought-stressed plants than in the control plants. The total free amino acid content tended to decrease in bothdrought-stressed and control plants with time. The total free amino acid content was found to be lower in thedrought-stressed plants than in the control plants and the proline content was unaffected. Moreover, at three weeks aftertreatment, carotenoid content in drought stressed plants was significantly higher than that in the untreated plants. We believethat our study makes a significant contribution to the literature because the effects of drought stress on plant growthparameters, free amino acid, carotenoids, and proline accumulation in autumn growing cultivar of Chinese cabbage have notbeen widely studied in Korea, and our study provides valuable information in this regard, as Chinese cabbage is consumedthroughout the year in Korea.