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为提高蓝莓种子萌发率,探究了蓝莓种子催芽方法。以蓝莓种子为材料,采用室温、低温和变温等3种不同温度层积处理,进行发芽试验,比较了蓝莓种子发芽情况。结果表明:不同处理条件下蓝莓种子在萌发率、发芽势、发芽指数等各项指标上差异显著(P<0.01),变温层积处理的各项萌发指标达到最优,萌发时滞11 d、萌发历期30 d、发芽率57%、发芽势48.75%、发芽指数3.49。变温层积处理能使蓝莓种子萌发时期提前,能显著增加种子的萌发率、发芽势,可以显著提高蓝莓种子的发芽指数,采取变温层积催芽方法对蓝莓种子催芽,可有效解除蓝莓种子休眠,提高种子萌发效率。 相似文献
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研究了5、10、15、20、25、30、35、40℃不同温度处理对4种榆属榆树种子发芽的影响,并采用千粒质量、发芽率、发芽指数、活力指数、最初发芽时间、芽长和胚根长等指标对榆树种子发芽效果进行了评价。结果表明:随着温度的升高,榆树种子发芽率、发芽指数、活力指数均上升。此外,随着温度的升高,芽和胚根出现不同的生长趋势,芽生长增加而根生长减少,各榆树种子最初发芽时间随温度的升高而缩短,发芽的最适温度因种和品种而异。 相似文献
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试验在保持温度、光照、基质等适宜的条件下,主要研究了土壤湿度分别为5%、10%、15%、20%的不同处理对沙棘种子萌发的影响,并采用发芽指数和活力指数对沙棘种子发芽效果进行了评价。试验结果表明,在不同的土壤湿度条件下,沙棘种子的萌发指标明显不同,其发芽率、发芽势、发芽指数和活力指数在土壤湿度为5%~20%范围内随土壤湿度的增加呈现出先增加后减小的趋势,10%~15%的处理其值较大。平均发芽时间也表现出明显的差异,在土壤湿度为5%~20%的范围内,随土壤湿度的升高呈现出先减小后增加的趋势,沙棘种子的活力指数先减小后增加,10%~15%的处理其值较小。从而得出,沙棘种子发芽的适宜湿度范围10%~15%。 相似文献
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赤霉素对2个玛咖品种种子萌发的影响 总被引:1,自引:0,他引:1
《西部林业科学》2015,(5)
以黑色玛咖和黄色玛咖的种子为材料,采用不同浓度的赤霉素(0 mg/L、50 mg/L、100 mg/L、200 mg/L、400 mg/L)浸种24 h,测定其种子发芽率、发芽势、根长等指标,比较不同浓度赤霉素对玛咖种子发芽的影响。结果表明,与对照相比,不同浓度赤霉素处理均能提高玛咖种子发芽率、发芽指数、根长等指标,当赤霉素浓度为200 mg/L时,对黄色和黑色玛咖种子发芽效果最佳。不同浓度赤霉素浸种后,黄色玛咖种子萌发的各项指标均大于黑色玛咖种子。 相似文献
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以3个不同产地的胡枝子种子为材料,研究产地和萌发温度条件对种子萌发的影响,结果表明:产地对胡枝子种子的发芽指数无明显影响,但对种子发芽率和平均发芽时间均有极显著影响;其中黑龙江帽儿山产地种子的发芽率最高,发芽时间也最长;内蒙古扎兰屯产地种子发芽率和发芽时间居中;吉林蛟河产地种子发芽率最低,发芽时间却最短.萌发温度条件对胡枝子种子的发芽率、发芽指数和发芽时间均有极显著影响.15℃条件下种子的发芽率最高,20℃条件下种子的发芽指数最高,25℃条件下种子的平均发芽时间最短,30℃条件下种子各项发芽指标最差.产地与萌发温度的交互作用对种子发芽率和发芽指数影响不显著,但对种子发芽时间有极显著影响. 相似文献
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指出了青钱柳种子育苗采用3种不同方式浸种,其一用温水浸种处理,其二用吲哚乙酸200×10-6溶液浸种处理,其三用ABT3号3号生根粉200×10-6溶液浸种处理。分别用于大田育苗试验。实践证明:用ABT3号生根粉溶液浸种的种子发芽率,比用温水浸种、吲哚乙酸溶液的种子发芽率分别提高8.1%、7.8%,出土萌芽率分别提高6.7%、5.5%,苗木生长成活率分别提高8.9%、4.4%。一年生的苗木生长量,用ABT3号生根粉溶液浸种的种子培育的苗木,地径、苗高,比用温水浸种的种子和用吲哚乙酸溶液浸种的种子培育的苗木生长苗高,分别大13.0%、7.1%,地径粗26.4%、10.3%,生长率分别提高30.8%、5.6%。 相似文献
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《林业研究》2017,(5)
Cordia africana is a very important indigenous tree species for timber and other products and services in Ethiopia.Seed traits and seedling vigour of seeds from 12 provenances of the species were compared.Mean seed mass for each provenance was assessed for 1000 seeds in10 replications,and seed length and width were measured for 100 seeds in four replications per provenance.Germination was assessed in a glasshouse taking 400 seeds from each provenance.Root collar diameter and height of 440 seedlings grown in a nursery for 290 days in Addis Ababa were measured.Seed length,seed width,seed mass,and shoot height and root collar diameter of seedlings showed significant differences(P0.001) among provenances.Correlation analysis between seed and seedling traits and environmental variables revealed significant positive correlations between seed width and germination percentage,seed width and altitude,seed width and longitude and seed length and latitude.Negative correlations were obtained between seed width and temperature,seed width and rainfall,seed mass and temperature,and germination and temperature of the seed source.As expected,differences in seed trait did not explain the variability in seedling vigour.Determining quantitative variations in seed traits and seedling vigour among provenances and the patterns along environmental gradients are essential for informing decisions on the tree improvement programme of the species. 相似文献
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Uma Shankar 《New Forests》2006,31(2):305-320
In species with seeds losing viability shortly after dispersal and exhibiting inherently low germination, quick decisions are required with respect to seeds that should be selected to maximize germination success and vigorous growth of seedlings. In ‘hollong’ (Dipterocarpus macrocarpus Vesque), I address the following questions: (a) are seeds that germinate randomly distributed within a seed population, (b) are subpopulations of viable and non-viable seeds separable, (c) does seed size predict which seeds germinate and (d) does seed size predict time required for germination and seedling vigour? Two estimators of seed size, diameter and weight, demonstrated a significant positive linear relationship endorsing assumption that accumulation of mass increases with increase in diameter of seeds. A threshold for selection of potential seeds for germination could not be derived from diameter measurements since seeds in an entire range of diameter did or did not germinate. All seeds <11 g did not germinate, but this threshold lies at the far lower end of the weight range and allows rejection of only a few seeds and acceptance of many seeds that will not germinate. A risk of potential seeds being rejected or non-viable seeds being picked exists if selection was derived from either diameter or weight. However, viable seeds could be better predicted from a scatter-plot of diameter on x-axis and weight on y-axis. Seeds showed a fan-shaped scatter and those developing the lower blade of the fan did not germinate while those following the handle were successful. Hence, two subpopulations segregated, but with a fuzzy edge. Mean diameter and mean weight of germinated seeds were significantly greater than those of ungerminated seeds. Most ungerminated seeds were those that had relatively smaller weight compared to their diameter. Although some large diameter seeds with small weight did germinate, but failed to develop into seedlings. Germination time and seedling vigour parameters (height, leaf number and collar diameter) were correlated both with diameter and weight. However, weight appears to have mattered more than diameter in germination success and early seedling growth. 相似文献
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Cordia africana is a very important indigenous tree species for timber and other products and services in Ethiopia. Seed traits and seedling vigour of seeds from 12 provenances of the species were compared. Mean seed mass for each provenance was assessed for 1000 seeds in 10 replications, and seed length and width were measured for 100 seeds in four replications per provenance. Germination was assessed in a glasshouse taking 400 seeds from each provenance. Root collar diameter and height of 440 seedlings grown in a nursery for 290 days in Addis Ababa were measured. Seed length, seed width, seed mass, and shoot height and root collar diameter of seedlings showed significant differences (P < 0.001) among provenances. Correlation analysis between seed and seedling traits and environmental variables revealed significant positive correlations between seed width and germination percentage, seed width and altitude, seed width and longitude and seed length and latitude. Negative correlations were obtained between seed width and temperature, seed width and rainfall, seed mass and temperature, and germination and temperature of the seed source. As expected, differences in seed trait did not explain the variability in seedling vigour. Determining quantitative variations in seed traits and seedling vigour among provenances and the patterns along environmental gradients are essential for informing decisions on the tree improvement programme of the species. 相似文献
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杉木种子萌发过程中细胞超微结构的变化及其与种子活力的关系 总被引:1,自引:0,他引:1
种子活力研究工作目前已由简单的发芽生理指标深入到细胞器、酶及核酸代谢等研究中。Woodstock及傅家瑞等在论述种子活力及其生理生化基础时,都首先强调了细胞膜和细胞器的完整性及结构上的变化对活力的影响。至今,国内外已在花生、黑麦、意大利伞松,大豆,绿豆等种子的细胞超微结构变化方面作了不同程度的报道。但这些研 相似文献