[Objective] This study aimed to observe the embryonic development process of Leiocassis crassilabris. [Method] Wild L. crassilabris collected from the Nanjing section of the Yangtze River was used as parent fish for i...[Objective] This study aimed to observe the embryonic development process of Leiocassis crassilabris. [Method] Wild L. crassilabris collected from the Nanjing section of the Yangtze River was used as parent fish for intensive breeding and propagation by artificial insemination. The entire embryonic development process of L. crassilabris from insemination to hatching out of larvae fish was observed consecutively. [Result] Fertilized eggs of L. crassilabris are spherical, and the egg diameter is about 2.2-2.4 mm after water absorption; under conditions of water temperature ranging from 27 to 28 ℃, the embryonic development of L. crassilabris from insemination to hatching out of larvae fish lasted 2 496 min, with a total accumulated temperature of 1 123-1 165 h·℃. [Conclusion] This study is advantageous to better understand the characteristics of embryonic development of L. crassilabris and provides basic biological data for protection and utilization of fish resources and other related work.展开更多
Cassava is vulnerable to frost and snow, so it is suitable for planting in tropical and subtropical region. Low temperature is an important environment factor affecting the growth and development and production of cas...Cassava is vulnerable to frost and snow, so it is suitable for planting in tropical and subtropical region. Low temperature is an important environment factor affecting the growth and development and production of cassava, and the region with annual average temperature below 15 ℃ is not conducive to its normal growth and development. The improvement of cold resistance of cassava can increase the planting area and improve the yield and quality of cassava. In this study, morphological,physiological and biochemical and molecular researches on cold resistance of cassava, as well as the latest research progress,were reviewed in this paper. At the same time, some potential difficulties in the research on cold resistance of cassava were put forward, and the future work focus was also discussed.展开更多
基金Supported by Science and Technology Support Program of Science and Technology Department of Jiangsu Province(BE2009335)~~
文摘[Objective] This study aimed to observe the embryonic development process of Leiocassis crassilabris. [Method] Wild L. crassilabris collected from the Nanjing section of the Yangtze River was used as parent fish for intensive breeding and propagation by artificial insemination. The entire embryonic development process of L. crassilabris from insemination to hatching out of larvae fish was observed consecutively. [Result] Fertilized eggs of L. crassilabris are spherical, and the egg diameter is about 2.2-2.4 mm after water absorption; under conditions of water temperature ranging from 27 to 28 ℃, the embryonic development of L. crassilabris from insemination to hatching out of larvae fish lasted 2 496 min, with a total accumulated temperature of 1 123-1 165 h·℃. [Conclusion] This study is advantageous to better understand the characteristics of embryonic development of L. crassilabris and provides basic biological data for protection and utilization of fish resources and other related work.
基金Supported by Earmarked Fund for China Agriculture Research System(CARS-11-cssy)
文摘Cassava is vulnerable to frost and snow, so it is suitable for planting in tropical and subtropical region. Low temperature is an important environment factor affecting the growth and development and production of cassava, and the region with annual average temperature below 15 ℃ is not conducive to its normal growth and development. The improvement of cold resistance of cassava can increase the planting area and improve the yield and quality of cassava. In this study, morphological,physiological and biochemical and molecular researches on cold resistance of cassava, as well as the latest research progress,were reviewed in this paper. At the same time, some potential difficulties in the research on cold resistance of cassava were put forward, and the future work focus was also discussed.
