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- Ratio of pollen and ovule 花粉-胚珠比
- The nutritive reserves in angiosperm pollen grains and the pollen and ovule numbers of single flowers are considered to be correlated with the pollinating vectors. 摘要植物花粉中营养物质的储存形式以及单花的花粉数与胚珠数被认为与其传粉系统有一定的联系。
- Pollen-ovule ratio (P/O) of the angiosperms, the ratio of pollen grains to ovules, can reflect more indications than floral morphology for the breeding systems. 摘要花粉-胚珠比系指开花植物之花粉数与胚珠数的比值,对植物之繁殖系统较花之形态更具有指标作用。
- A brownish substance consisting of a mixture of pollen and honey and used by bees as food. 蜜蜂的花粉食料蜜蜂用作食物的花粉与蜂蜜所混合的棕色物质
- Title: Ultrastructural Studies on the Developmental Process of Pollen and Anther in Rice (Oryza sativa L. 关键词:水稻;小孢子发生;花粉发育;绒毡层发育;超微结构
- According to the characteristics of pollen and spore assemblages, lithology and nanofossils, the climate in the middle Holocene was warm and humid. 根据第三阶段的孢粉组合特征、岩性特征以及微体化石可知,全新世中期的气候比较适宜,气候温暖湿润。
- Most of the taxa which are very important in the vegetation are reflected reasonably faithfully by the combination of pollen and macrofossil. 利用植物残体与孢粉分析相结合的方法能更准确地重建植被历史。
- The ratios of 1 to 5 and 20 to 100 are the same. 1与5之比和20与100之比相同。
- The best ratio of performance and price. 最优的性能价格比。
- Genetic affininity among 3 Asian rice ecotypcs(bulu, aus and upland)was studied on the basis of pollen and spikelet fertility in 146 F_1 hybrids involving 13 parents. 根据13个亲本146个F_1的花粉育性和小穗育性,研究了亚洲栽培稻三个生态型(布鲁、奥斯及陆稻)的遗传亲和性。
- The co-infection ratio of ALV and CLV was 6.24%. ALV的阳性率13.;49%25,二者共感染的阳性率是6
- Mix pure alcohol and naphtha in a ratio of 3:7. 可以把纯酒精和挥发油以三比七的比例混合.
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- The effects of pollen and plant growth stages on the populations of western flower thrips,Frankliniella occidentalis,were studied on two cultivars Impulse Orange and Cajun Carmine of impatiens. 在凤仙花的Impulse Orange和Cajun Carmine品种上开展了花粉和植物不同生长阶段对西花蓟马种群的影响。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- Abstract: Aims:The aim of this study was to reveal the structure of pollen grain and demonstrated nuclei in the pollen and the artificially germinated pollen tube of Cedrus deodara. 摘 要:目的:为了更直观地观察和显示花粉和花粉管中细胞结构及其细胞核的状态与行为。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- The results of cytological observation showed that the abnormal feature of pollen development appeared at binucleate stage.The starch was failed to accumulated in pollen and lead to mature sterile. 细胞学观察T0代转化植株花粉从单核到成熟发育过程,结果表明花粉育性下降的原因主要是由于二核期花粉发育淀粉粒累积受阻所致。
- For the branches with seeds, the height of branch was positively correlative to the numbers of fertilized ovules, and developed and aborted seeds, indicating the important effect of pollen and light. 而对不同结实枝条,其高度与受精胚珠数、败育种子数和发育种子数均呈极显著的线性关系,表明传粉或光照可能起到重要作用。
- The mean vitality of pollen reaches 92%. 花粉生活力平均为92%25。