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Evaluation of Physiochemical Changes of Asian Pear Cultivars During Winter Season
Sherzod Rajametov,Sam-Seok Kang,Yoon-Kyeong Kim,Hyung-Jin Baek 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.4
이 연구는 2012년과 2013년 동절기에 아시아 배 품종인 신고와 추황배를 공시하여 생리화학적인 상태의 변화를 평가하기 위해 실시하였다. 추황배는 줄기에서 높은 수분부족과 수분함량을 보여 신고와 구별되었다. 겨울동안 줄기와 눈에서 화학성분이 다양하게 변화하였으며, 미네랄 성분은 줄기보다 눈에서 높게 나타났다. 두 품종 모두 겨울동안 줄기에서 포도당, 과당, 갈락토오스가 증가하였기 때문에 기관 발달과정에서의 식물의 생장반응과 온도의 변화에 따른 신진대사의 수준이 일정하게 유지되었다. 신진대사의 모든 과정은 상호 연관되며 그들 사이에 접합이 방해하는 이유는 시스템 전체의 안정성을 저하시키는 대사산물을 축적하기 때문으로 판단된다. This study was conducted to evaluate the physicochemical changes of Asian pear cultivars ‘Niitaka’ and ‘Chuwhangbae’ during the winter of 2012 and 2013. Cultivar ‘Chuwhangbae’ distinguished with high water deficit and water content in shoots as compared with cv. ‘Niitaka’. However, water content of ‘Chuwhangbae’ was higher in buds than ‘Niitaka’. Chemical content in shoots and buds were varied during the winter season. Mineral compositions were higher in buds than in shoots, also values insignificantly varied and showed stable compared to shoots in both cultivars. During cold period in shoots of both cultivars significantly increased of glucose and fructose. Therefore, response of plants and the transition into the new level under action of the minus celsius degrees should be held equally at the all levels of the metabolism depending on the phase of development. All processes are interrelated and the backlog of any of them is the reason that leads to violation of conjugation between them, the accumulation of the metabolic products that reduce the stability of the entire system.
Rajametov Sherzod,양은영,조명철,채수영,채원병 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5
Plants are very sensitive to environmental stresses, particularly to high temperature (HT) which is predicted to increase. Thisstudy was conducted to investigate the response to HT for identifying physiological traits associated with HT tolerance intomato. Thirty-eight tomato accessions with three fruit sizes (cherry, medium and large) were grown in greenhouses wheretemperature set-point for ventilation was 25 °C and 40 °C for normal temperature (NT) and HT, respectively. HT increasesplant height and stem diameter but little eff ect on leaf length and width. For reproductive traits, HT has positive eff ect onthe number of fl owers (NFL) but negative on the number of fruits (NFR), fruit set (FS), weight (FW) and yield (FY), andpollen germination (PG) and tube length. In the correlation analysis, except for accession T37 with extreme value causingspurious results, PG did not show signifi cant correlation with FS, FW and FY, but with NFL and NFR in HT condition. NFR(HT), FS (HT) and FY (NT) are identifi ed as physiological traits associated with HT tolerance based on correlation with FY(HT). However, their association to HT tolerance diff er by fruit sizes. NFR (HT) was signifi cantly correlated with FY (HT)in sub-population of cherry (r = 0.859**, n = 14), medium (r = 0.848**, n = 7) and large fruit types (r = 0.769**, n = 16) butnot in total population (r = 0.302NS, n = 37). FS (HT) and, interestingly, FY (NT) were signifi cantly correlated with fruityield (HT) in total population and a cherry fruit sub-population but not in medium and large fruit sub-population. Resultssuggest that physiological traits associated with HT tolerance diff er by fruit size and breeding programs should considerdiff erent selection criteria for diff erent fruit types when develop cultivars with HT tolerance.
( Sherzod Rajametov ),( Sam Seok Kang ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.1
The purpose of this study was to investigate responses of pear cultivars ‘Niitaka’ and ‘Chuwhangbae’ under short period heating on cold resistance level of flower buds. Experiment was conducted using annual shoots flower bud which were artificially heated (AH) during 72 hour at room condition (18-20℃). To assay for cold resistance, the cultivars were treated and observed under negative temperatures -10, -15, -20 and -25℃ during the winter period in 2012 and 2013. Our findings revealed that ‘Chuwhangbae’ which was treated under control and artificial heating treatments was more resistant to low temperature than ‘Niitaka’ showing decreasing level of flower buds damages by mid-January although in early March an increasing level of damages was observed again. Cold resistant cultivar ‘Chuwhangbae’ responded more sensitively to external environments. This means that ‘Chuwhangbae’ restructures the plant protoplasts and process the transition to the new metabolic energy level in an efficient manner when triggered by effective negative temperatures thereby resulting in hardening process. We assume that this might be closely related with dormancy period, concentration of the mineral elements, water potential and transition processes of metabolism to the new energetic level. With a rise in temperature, cold tolerance in pear cultivars significantly decreased and this is related to intensive development of the floral organs. The chilling requirements for blossoming of ‘Niitaka’ was higher than ‘Chuwhangbae’.