[Objective] To study the ecophysiological effects of low temperature stress on Actinidia arguta （Seib.et.Zucc.）, and provide a theoretical basis for the introduc- tion and breeding of cold resistant varieties. [Meth...[Objective] To study the ecophysiological effects of low temperature stress on Actinidia arguta （Seib.et.Zucc.）, and provide a theoretical basis for the introduc- tion and breeding of cold resistant varieties. [Method] A. arguta as the test material was processed at room temperature of 4 ℃ to determine the contents of chloro- phyll, water soluble sugar, water soluble protein, free proline, MDA, and antioxidant enzymes （POD activity, SOD activity, CAT activity） with the treatment at 25℃ as the control. [Results] The results indicated that with the prolonging of stress time, the content of chlorophyll was first increased and then decreased, and the content of MDA was increased; soluble sugar content of seedling leaf decreased gradually, while the soluble protein and proline content of seedling leaves were first increased and then decreased; the activities of SOD and POD were displayed a decline trend, meanwhile the activities of CAT was first increased and then decreased. [Conclu- sion] The various indicators showed that under low temperature stress, the chloro- phyll content decreased accompanied with membrane lipid peroxidation and MDA accumulation, and soluble sugar, soluble protein, free proline and antioxidant en- zymes play a protective role in different degrees.展开更多
China's entry to WTO and China's 2008 Olympic Games have widely opened the door to the outside world.Tal ents with business knowledge and excellent oral English are urgently needed.For students in English majo...China's entry to WTO and China's 2008 Olympic Games have widely opened the door to the outside world.Tal ents with business knowledge and excellent oral English are urgently needed.For students in English major,we give the course of Spoken English for International Business(SEIB) to improve their abilities in SEIB.The author aims to use the methods like classroom observation,interview,questionnaire survey to observe and compare two classes and two teachers to explore the rela tions between students'competence development and teachers'with different levels and teaching practice,and to gain some enlightenment on students'competence developing in SEIB from the study.展开更多
采用石蜡切片和光学显微技术,对生长在白城郊区和长春市不同生态环境下的001号和010号野生大豆(Glycine soja Seib.et Zucc).,进行同步栽培试验、同步结构比较研究。结果发现,生长在白城郊区的野生大豆根演化出比长春市生长的野生大豆...采用石蜡切片和光学显微技术,对生长在白城郊区和长春市不同生态环境下的001号和010号野生大豆(Glycine soja Seib.et Zucc).,进行同步栽培试验、同步结构比较研究。结果发现,生长在白城郊区的野生大豆根演化出比长春市生长的野生大豆较高级的抗盐结构。盐渍环境下白城郊区的野生大豆001号和010号的根变粗、周皮厚度增大、次生木质部导管孔径大、数量多,木质部管孔链多,长春市的野生大豆根较细,单管孔多。试验结果表明,野生大豆植物在盐碱环境胁迫下,根已经演化出颉颃逆境结构,这些变化证明盐胁迫直接影响了野生大豆植物体根形态结构的形成。展开更多
基金Supported by the Special Fund for Agro-scientific Research in the Public Interest (201303093)the Key Project for Agricultural Improved Variety Breeding of Shandong Province (Lunongliang[2016]No.6~~
文摘[Objective] To study the ecophysiological effects of low temperature stress on Actinidia arguta （Seib.et.Zucc.）, and provide a theoretical basis for the introduc- tion and breeding of cold resistant varieties. [Method] A. arguta as the test material was processed at room temperature of 4 ℃ to determine the contents of chloro- phyll, water soluble sugar, water soluble protein, free proline, MDA, and antioxidant enzymes （POD activity, SOD activity, CAT activity） with the treatment at 25℃ as the control. [Results] The results indicated that with the prolonging of stress time, the content of chlorophyll was first increased and then decreased, and the content of MDA was increased; soluble sugar content of seedling leaf decreased gradually, while the soluble protein and proline content of seedling leaves were first increased and then decreased; the activities of SOD and POD were displayed a decline trend, meanwhile the activities of CAT was first increased and then decreased. [Conclu- sion] The various indicators showed that under low temperature stress, the chloro- phyll content decreased accompanied with membrane lipid peroxidation and MDA accumulation, and soluble sugar, soluble protein, free proline and antioxidant en- zymes play a protective role in different degrees.
文摘China's entry to WTO and China's 2008 Olympic Games have widely opened the door to the outside world.Tal ents with business knowledge and excellent oral English are urgently needed.For students in English major,we give the course of Spoken English for International Business(SEIB) to improve their abilities in SEIB.The author aims to use the methods like classroom observation,interview,questionnaire survey to observe and compare two classes and two teachers to explore the rela tions between students'competence development and teachers'with different levels and teaching practice,and to gain some enlightenment on students'competence developing in SEIB from the study.
文摘采用石蜡切片和光学显微技术,对生长在白城郊区和长春市不同生态环境下的001号和010号野生大豆(Glycine soja Seib.et Zucc).,进行同步栽培试验、同步结构比较研究。结果发现,生长在白城郊区的野生大豆根演化出比长春市生长的野生大豆较高级的抗盐结构。盐渍环境下白城郊区的野生大豆001号和010号的根变粗、周皮厚度增大、次生木质部导管孔径大、数量多,木质部管孔链多,长春市的野生大豆根较细,单管孔多。试验结果表明,野生大豆植物在盐碱环境胁迫下,根已经演化出颉颃逆境结构,这些变化证明盐胁迫直接影响了野生大豆植物体根形态结构的形成。
