玉米种子理化性状与种子活力的关系

发布时间：2018-06-28 15:45

本文选题：玉米种子 + 物理性状　；参考：《沈阳农业大学》2017年硕士论文

【摘要】：选取2015年于市场上购买的62种不同类型的玉米品种种子用来进行试验。田间出苗率是种子活力的一种体现,主要表现在种子在田间的成苗率上。现在种业也普遍应用抗冷发芽率来作为标准,对种子活力大小进行分析。因此,本试验以田间出苗率和抗冷发芽率为标准,与玉米种子物理性状和化学成分进行相关分析,明确种子理化性状与种子活力的关系,为玉米育种、种子加工的清选等生产实践提供参考依据。主要结论如下:1.标准发芽试验是用来测定种子批的最大发芽潜力,我国要求的生产用种的标准发芽率在85%,本试验中有60种玉米品种种子达到合格标准,达到标准的玉米品种种子在97%以上,说明本试验中所选供试玉米材料具有良好的代表性。2.玉米种子的千粒重,比重,容重与田间出苗率和抗冷发芽率的相关关系不显著,说明不能依靠千粒重,比重,容重来直接进行种子活力大小的判断。扫描特性中宽度和投影面积与田间出苗率和抗冷发芽率在0.05水平上存在显著负相关关系,与宽度的相关系数值为-0.425,与投影面积的相关系数值为-0.512,说明在一定范围内,随着宽度和投影面积的减小,种子活力会有所升高。玉米种子的淀粉含量和脂肪含量与田间出苗率和抗冷发芽率相关关系不显著,不能通过淀粉含量和脂肪含量来直接进行判断种子活力的大小。玉米种子的蛋白质含量与田间出苗率和抗冷发芽率存在显著正相关关系,相关系数值为0.533,表明在一定条件下随蛋白质含量增加,种子活力会逐渐升高。物理性状中随着扫描特性的宽度和投影面积减小,化学成分中随着蛋白质含量增加,种子活力会随之升高,可以作为高活力种子选择的依据。
[Abstract]:Sixty-two different types of maize seeds purchased in the market in 2015 were selected for the experiment. Field emergence rate is a kind of embodiment of seed vigor, which is mainly reflected in seed seedling rate in field. At present, cold-resistant germination rate is widely used in seed industry to analyze seed vigor. Therefore, based on the standard of field emergence rate and cold tolerance germination rate, the correlation analysis was carried out with the physical characters and chemical components of maize seeds, and the relationship between seed physical and chemical properties and seed vigor was clarified, which was used for maize breeding. The production practice of seed processing and so on provides the reference basis. The main conclusions are as follows: 1. The standard germination test is used to determine the maximum germination potential of seed batches. The standard germination rate of the production seeds required in China is 85%. In this experiment, 60 maize varieties have reached the standard of seed germination, and the seed of maize varieties that have reached the standard is more than 97%. It shows that the maize materials selected in this experiment have good representativeness. 2. The correlation between seed weight, specific weight, bulk density and field emergence rate and cold resistance germination rate was not significant, which indicated that the seed vigor could not be judged directly by 1000-grain weight, specific weight and bulk weight. There was a significant negative correlation between width and projection area and field emergence rate and cold resistance germination rate at 0.05 level, the correlation coefficient with width was -0.425, and the correlation coefficient with projected area was -0.512, which indicated that the correlation coefficient was within a certain range. With the decrease of width and projection area, seed vigor will increase. There was no significant correlation between starch content and fat content in maize seeds, and there was no significant correlation between seed emergence rate and cold tolerance germination rate, so the seed vigor could not be judged directly by starch content and fat content. There was a significant positive correlation between the protein content of maize seeds and field emergence rate and cold tolerance germination rate, the correlation coefficient was 0.533, which indicated that the seed vigor would increase gradually with the increase of protein content under certain conditions. With the decrease of the width and projection area of the physical properties and the increase of protein content in the chemical components, the seed vigor will increase, which can be used as the basis for the selection of high vigor seeds.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S513

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