共查询到20条相似文献，搜索用时 78 毫秒
1.
适贮条件下不同基因型玉米种子活力及生理特性研究 总被引：1，自引：0，他引：1
以5个不同基因型玉米种子为试验材料,设置种子含水量11％、贮藏温度25℃的适贮条件,贮藏一年时间,每月测定比较供试材料的生活力及生理变化。结果表明：各基因型玉米种子在适贮条件下随着贮藏时间的延长,发芽势、发芽率、发芽指数、活力指数、可溶性蛋白及可溶性糖含量、脱氢酶活性均出现了不同程度的下降,种子电导率及丙二醛含量均出现不同程度的升高。贮藏一年后各基因型玉米种子的发芽率仍保持在较高水平,但活力指数下降幅度较大,活力指数可作为反映种子劣变及老化程度的重要指标。同一贮藏条件下,基因型是影响生理特性的决定因素,参试材料京科968种子生活力及生理指标均变化较小,表现出较强的稳定性和耐贮性。 相似文献
2.
莴苣种子在50℃下恒温贮藏,不同含水量的种子老化速度差异很大,高水分种子迅速死亡,贮藏第28天,含水量＞6.7%的种子已死亡,而含水量＜6.7%的种子发芽率在90%以上.随着贮藏时间的延长,种子发芽率、活力下降明显,种子贮藏至第392天时,含水量＞4.1%的种子全部死亡,而含水量为1.6%～4.1%的种子其发芽率≥68%.发芽指数和活力指数的下降要快于发芽率.50℃恒温贮藏392d,含水量为2.0%～3.0%的种子活力下降最慢,含水量2.0%～3.0%是莴苣种子50℃恒温贮藏的最佳含水量. 相似文献
3.
云南松种子发芽对温度和生长调节剂的响应 总被引：2，自引：0，他引：2
为了解温度和GA3、IBA不同水平及其组合对云南松(Pinus yunnanensis)种子发芽的影响,采用L9 (34)正交设计进行外源激素浸种后置于不同温度条件下的发芽实验.结果表明,不同处理组合种子的发芽率、发芽势、平均发芽时间和发芽指数分别为66.0％～86.0％、14.0％～29.3％、7.9～11.7 d和3.3～5.6粒/d,处理组合间此4项指标具有显著(p＜0.05)或极显著(p＜0.01)的差异.温度是影响种子发芽的主导因子,19.6℃提高种子发芽率.温度和GA3的不同水平对云南松种子发芽指标具有显著(p＜0.05)或极显著(p＜0.01)的差异影响,0.10 g/L的GA3溶液浸种促进种子发芽.GA3、IBA和温度的两两交互作用对发芽指标影响较为复杂,特定条件下对发芽指标的交互效应不同. 相似文献
4.
超干燥保存的烟草种子活力变化规律研究 总被引：5，自引：0，他引：5
本文是在烟草种子超干燥保存技术研究取得初步成功的基础上，对1993－1994年采收并经过超干燥处理的4份烟草种子分别在原干燥器内继续保存2年和4年后进行的种子活力跟踪试验。并对种子发芽势、发芽率和发芽指数等指标作方差分析和多重比较。结果为：2年后不同干燥剂间种子的发芽势、发芽率和发芽指数差异显著，其中，各处理的种子活力排列为：硅胶＞硅胶＞生石灰＞生石灰；2：1＞1：1＞3：1＞4：1；牛津3号＞其它品种。4年后，烟草种子的发芽指数硅胶＞硅胶＋生石灰＞生石灰。万良烟＞其它品种，比例间无显著差异。对种子的含水量、发芽势、发芽率、发芽指数和活力指数相关矩阵进行分析，结果为含水量与发芽指数和活力指数之间，发芽势与发芽指数之间，发芽指数与活力指数之间差异显著，种子含水量对种子活力贡献最大，其次为发芽率，发芽势、发芽指数。几项指标间的相互关系可用多元方程表示：Y＝0．496507＋0．136777X1＋0．000567X2－0．007197X3－0．000201X4。方程可信度达93．12％。该试验为长期，安全保存烟草种子和延长超干燥烟草种子保存寿命提供理论依据及配套措施。 相似文献
5.
不同收获时期和贮藏时间对杂交粳稻种子活力的影响 总被引：1，自引：0，他引：1
以杂交粳稻常优3号种子为材料,研究了不同收获时期和贮藏时间的种子发芽势、发芽率和种子活力变化,以及对赤霉素的反应.结果表明:不同收获时期和贮藏时间对杂交粳稻种子的发芽和活力有显著的影响,种子在贮藏12个月后发芽势、发芽率和发芽指数显著下降,达到了显著水平,在种子低温贮藏8个月后的活力指数开始下降,12个月后下降达到了极显著水平,其中35d和50d收获的种子受影响最明显,40d和45d收获的种子表现较稳定,尤其是45d收获的种子.通过赤霉素(GA3)和清水浸种处理比较分析发现,种子发芽势、发芽率、发芽指数和活力指数的F值不显著,说明常优3号种子的休眠性不明显. 相似文献
6.
7.
8.
以江夏扁穗雀麦种子为试验材料,研究了扁穗雀麦种子发芽和休眠特征.结果表明,不同时期新收获的扁穗雀麦种子几乎不发芽,风干种子发芽率最高为4％,存在严重的休眠现象.随着种子干燥贮藏时间的延长,发芽率、发芽势和发芽指数逐渐增加,发芽开始时间提前.贮藏63d种子萌发出现急剧变化,发芽率达51.33％,与前期处理差异显著(p＜0.05);78～81d发芽率超过85％,休眠解除,发芽开始时间提前至第6天.不同成熟期收获的扁穗雀麦种子在解除休眠后发芽特性略有差异,但总的来说,成熟度高的种子在贮藏3个月后发芽率和发芽指数均较高. 相似文献
9.
10.
11.
大豆种子抗劣变性的鉴定方法研究 总被引：3，自引：0，他引：3
以抗种子劣变性不同的５个栽培大豆和５个野生大豆品种为材料，比较了高温湿（相对湿度１００％，温度４０℃）条件下贮藏３天、７天、１０天和１４天及２０％的甲醇浸泡２小时等５种种子加速第化方法鉴定了种子抗劣变性的效果。结果表明，高温高湿老化７－１０天和２０％的甲醇浸泡２小时，可鉴定出大豆种子抗劣变性。 相似文献
12.
13.
s:It is proposed that the research of the structural durability is necessary considering the structural damages under the effect of deterioration of reinforced concrete. The most common reasons, which cause the deterioration of structures in China, are reinforcement corrosion and freeze thaw cycles of concrete. Based on the summarizing of research works of the effect of reinforced concrete deterioration on structures, it is indicated that the structural durability research should be carried out either in view of material science or that of structural science, and should be also considered the interaction of several factors with uncertain nature instead of the determined individual factor analysis. The structural durability of serviceable should be paid much more attention while researching the durability of structural capacity. The effect of reinforced concrete deterioration on structural capacity, rigidity and durability should be researched henceforth. 相似文献
14.
大豆种子劣变与提高种子发芽率方法研究 总被引：1，自引：1，他引：0
1990-1992年间分别选用不同地理来源,在熟期、百粒重等方面有一定差异的春大豆品种共18个在长沙春、秋两季播种研究种子劣变及其影响因素,采用不同贮存条件和方法及渗调技术研究,贮藏效果和寻求提高大豆种子发芽率的方法。结果表明:大豆种子劣变品种间、不同播季间存在显著差异,收获前种子劣变在整个种子劣变中起主导作用,高温高湿气候是主要原因。收获后种子劣变主要为高温高湿加速生理生化变化所致,低温干燥贮藏能延缓种子劣变,改进贮存方法也可减轻劣变。种子自然回潮、聚乙二醇处理及固体渗调处理均显著提高大豆种子发芽率,其中,回潮6—7天和固体渗调技术可大面积生产应用。 相似文献
15.
甘肃民勤生态状况调查与分析 总被引：3，自引：2，他引：1
通过对石羊河流域生态状况的科学考察,特别是民勤绿洲荒漠化历史过程及其生态环境恶化成因的调查研究,客观分析了民勤生态环境治理中存在的水资源、生态植被、风沙危害、经济发展与生态保护的矛盾、生态移民、资金投入等方面存在的主要问题,并对民勤生态环境综合治理提出了对策和建议。 相似文献
16.
According to the analysis of existing test data, the stress influence coefficient and water-cement ratio influence coefficient in the existing concrete carbonation depth forecasting models are modified and improved. Based on the reliability analysis, the rule of deterioration life is presented. The analysis shows that the rate of carbonation of concrete is accelerated or restricted at the status of tensile or compressive stress, respectively. Especially with the increase of the level of tensile stress, the carbonation rate of concrete will become faster and faster. According to the results of reliability analysis, the relation between probability and reliability of the concrete deterioration is one-to-one corresponsive, meanwhile, the concrete cover thicknesses and stress levels have great influences on the durability life of concrete structures. And with the same reliability, the time of deterioration of concrete decreases with a higher stress levels and a less cover thickness. 相似文献
17.
18.
萌发过程中种子贮藏物质的动员和变化规律概述 总被引：2，自引：0，他引：2
种子萌发是植物生命的开端,此过程需要多种贮藏物质的动员来提供营养及能量,贮藏物质对种子萌发至关重要.本文概述了种子萌发所需主要贮藏物质(糖类、蛋白质、脂肪、磷)在种子萌发中的作用、动员情况和代谢变化规律,并与经劣变(老化)后的种子进行比较,从贮藏物质角度解析劣变对种子萌发和活力的影响,并对该领域未来的研究方向进行了展望... 相似文献
19.
U. R. Sangakkara 《Journal of Agronomy and Crop Science》1994,172(5):327-332
A field study was conducted with the objective of determining the effects of soil moisture on seed yield and quality of mungbean ( Vigna radiata L. Wilczek) when grown under rainfed and irrigated conditions in a dry season. Seed quality was determined in terms of germination and production of normal seedlings after controlled deterioration. The presence of adequate soil moisture increased growth and yields of mungbean significantly. The seeds from irrigated plots had a greater weight, owing to heavier cotyledons. Although germination of seeds from the irrigated plots was higher before and after controlled deterioration for 72 h, the number of abnormal seedlings was also greater. Controlled deterioration reduced germination of both categories of seed in the same manner. These factors indicate the low potential of using seeds produced under irrigation in dry seasons as planting material, especially after storage. 相似文献
20.
Summary Deterioration of cotton, Gossypium hirsutum L., seed can adversely affect stands, seedling vigor, and subsequent performance of plants, but deterioration can be lessened by improved genetic resistance. This study was conducted to evaluate the relationship of physical and germination characteristics of cotton seed and to determine the inheritance of resistance to seed deterioration. Physical (weight, volume, density, and imbibition rate) and germination (germination of non-deteriorated seed and deteriorated seed) characteristics were determined for eight cotton genotypes. In addition, imbibition rate and the germination characteristics were determined for all possible F1, including reciprocals, combinations of the eight genotypes. Variation among the parents for germination of deteriorated seed and imbibition rate were significantly, highly correlated (r=–0.97) and intrinsically related. Resistance to seed deterioration tended to increase as seed weight and volume decreased. Significant genetic effects were found for imbibition rate and germination of both non-deteriorated and deteriorated seed. However, general combining ability (GCA) accounted for only 21% of the variation in crosses sums of squares for germination of non-deteriorated seed. In contrast, GCA accounted for 90% of the variation for germination of deteriorated seed and imbibition rate. A breeding approach involving selection of early generation seed for ability to survive hot water treatment, then evaluating later generations for imbibition rate is suggested as a means to improve resistance to seed deterioration in cotton. 相似文献