人工养殖状态下牛蛙的生物学习性

牛蛙生长的最适温度为25-32℃,繁殖的最适温度为20-30℃.牛蛙以动物性食物为主,在不同的发育阶段,食性也不尽相同.当水温升到18℃以上时,牛蛙开始发情.牛蛙的产卵量与年龄、个体大小、营养条件及生态条件等有很大关系,一般情况下,产卵量自1万至5万粒不等.卵孵化的最适水温为25-28℃.蝌蚪完成变态发育需要77d.每年11月下旬至翌年3月份为牛蛙的越冬期.     

不对称体细胞杂交与作物育种

本文讨论不对称体细胞杂交技术的建立及其在作物育种中的应用前景．     

基于线性自抗扰控制的工件台单扫描轴应用研究

随着新一代人工智能技术的发展,其在智慧教育领域的应用日趋深入。对幼儿园信息管理、家园互通、幼儿成长记录、幼儿成长分析进行研究,阐述人工智能技术应用于幼儿成长记录分析和家园共育中的重要性,并根据“互联网+”学前教育变革相关政策,提出基于人工智能技术的新型幼儿成长记录系统构建方案,以更好地记录幼儿成长过程相关信息,为幼儿成长及教育教学提供数据支持。     

章鱼在人工养殖环境中生活习性的探讨

章鱼人工养殖前人做得很少，通过探讨人工养殖环境中章鱼的生活习性等，为科学养殖章鱼提供参考．     

绿臭蛙的繁殖生态

采用野外定期定点观测与室内观测相结合的方法,对绿臭蛙(Odorrana margaretae)的繁殖生态进行了初步的研究,结果表明:绿臭蛙繁殖期在7月上旬-8月下旬;怀卵量为1269.8枚;产卵量为1169枚.     

短翅树莺的繁殖和生态适应性研究

本文全面地观察记述了短翅树莺在皇甫山自然保护区的种群分布、数量、栖息环境,并详细观察研究了其繁殖习性和食性与本地自然生态的适应性.     

红叶石楠非试管快繁效果的研究

红叶石楠(photinia glabra)是一种具有较高开发价值的彩叶树种。通过快繁宝1号处理,运用植物非试管快繁技术进行种苗繁殖,具生根快、生根率高、移苗成活率高等优点。不同浓度快繁宝1号处理红叶石楠枝段生根效果不同,以200 mg/L处理枝段2h生根效果最好。用200mg/L快繁宝1号处理顶芽、带叶枝段,结果证明带叶枝段生根效果较顶芽好。     

遗传改良在水产养殖上的应用

遗传改良在水产养殖中具有重要的作用。在各种改良方法中,选择育种是目前应用最广泛的方法,而基因工程育种将会在水产物种改良中起重要的作用。但对水产物种的遗传改良不应降低种群的遗传多样性,以致危害人类健康和社会伦理。     

中国水牛分子育种的研究进展

概述了中国水牛分子育种的研究进展,包括水牛遗传的多样性和起源研究,产奶性状、免疫功能、繁殖性状基因的研究,功能基因的克隆与分析以及生产性能的微卫星标记等方面的内容.指出目前中国水牛分子育种研究中存在的问题,并展望了水牛分子育种的前景.     

Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

Objective

Heavy ion beam, which has emerged as a new mutagen in the mutation breeding of crops and ornamental plants, is expected to result in the induction of novel mutations. This study investigates the morphological and biochemical responses of Oryza sativa toward different doses of carbon ion beam irradiation.

Methods

In this study, the dry seeds of O. sativa were irradiated at 0, 20, 40, 60, 80, 100, and 120 Gy, followed by in-vitro germination under controlled conditions. Morphological and biochemical studies were conducted to investigate the morphological and physiological responses of O. sativa towards ion beam irradiation.

Results

The study demonstrated that low doses (10 Gy) of ion beam have a stimulating effect on the height, root length, and fresh weight of the plantlets but not on the number of leaves. Meanwhile, doses higher than 10 Gy caused reductions in all the morphological parameters studied as compared to the control samples. The highest total soluble protein content [(2.11±0.47) mg/g FW] was observed in plantlets irradiated at 20 Gy. All irradiated plantlets were found to have 0.85% to 58.32% higher specific activity of peroxidase as compared to the control samples. The present study also revealed that low doses of ion beam (10 and 20 Gy) had negligible effect on the total chlorophyll content of O. sativa plantlets while 40 Gy had a stimulating effect on the chlorophyll content. Plantlets irradiated between 40 to 120 Gy were shown to be 0.38% to 9.98% higher in total soluble nitrogen content which, however, was not significantly different from the control samples.

Conclusions

Carbon ion beam irradiation administered at low to moderate doses of 10 to 40 Gy may induce O. sativa mutants with superior characteristics.