查询词典 sexual reproduction

Spinulosa decreased significantly when the water depth was more than 2 meters, as well as the sexual reproduction strategy of V.

随着水位的变化，有性繁殖体的投资比率发生变化，从水深1.4 m的2.77% 0.96%到水深2 m的0.13% 0.22%；而无性分株繁殖方式水深2 m以下没有显著差异。

In order to investigate the effects of different shading levels (Shading levels were: control 0, 50%, 80%, 90%) on the trade-off relations between sexual reproduction and clonal multiplication of Vallisneria spinulosa, a natural greenhouse experiment was carried out by winter tuber of Vallisneria spinulosa being collected from Poyang Lake in the Jiangxi Province.

以采自江西鄱阳湖的刺苦草冬芽为实验材料，在自然温室中经历了全不遮阳、部分遮阳等4种处理，研究不同遮阳处理产生的光线差异对刺苦草的有性繁殖和无性繁殖方式的资源配制的影响。

Coevolution, freshwater snails, maintenance of sexual reproduction, Red Queen hypothesis, Trematoda, parthenogenesis.

&研究表明，在寄生虫丰富的环境中，有性生殖可以赋予物种进化优势，&约凯拉表示。

However, the growth of rotifer fed on high-density Chlorella pyrenoidosa was inhibited notably, and there was no effect on its fecundity. Sexual reproduction of Brachionus urceus was not promoted by improving the density of diet.

结论］低食物浓度下，轮虫生命周期缩短、繁殖力降低；食物浓度过高，能抑制轮虫生长，但对繁殖力影响不大；提高食物浓度，对壶状臂尾轮虫的有性生殖没有明显的促进作用。

Sexual reproduction can bring about genetic commingling.

有性繁殖可取得杂交遗传。

In order to explain clearly the variation status of embryo from tetrapoid Robinia pseudoacacia and fully use the variation resource initiated in the sexual reproduction of TRP in the further improvement of TRP, the classification and vitalities of seed embryos from tetraploid Robinia pseudoacacia were studied. The main results are as follow. According to the cotyledon number, color and plumpness, the seed embryos of TRP could be divided into 5 types: YVT (yellow, very replete,2 cotyledons), YMT( yellow, more replete,3 cotyledons ), YRF ( yellow, replete,4 cotyledons ), GNT ( green, no-replete, 2 cotyledons ) and WNT ( white, no-replete, 2 cotyledons ).

为了阐明刺槐同源四倍体种子胚变异状况及充分利用刺槐同源四倍体有性过程创造的变异资源对四倍体刺槐进行遗传改良，研究了刺槐同源四倍体种子胚类型及其生活力特征，主要结论如下：刺槐同源四倍体种子胚按照子叶数量、颜色及饱满程度，可以划分出5个类型：黄二、黄三、黄四、绿二及白二，所有类型种子胚混合平均单胚重量接近二倍体的1/2。

Fungi Anamorphici (Deuteromycota; Fungi Imperfecti; mitosporic fungi) A phylum of so-called ' imperfect ' fungi in which sexual reproduction is unknown or has been lost during evolution.

半知菌类：这是号称&不完全&真菌的一个门。

Generally, local clonal diversity is determined by the dynamic balance between loss of established genets and recruitment of new genotypes via sexual reproduction or colonization, as described by Eriksson's recruitment mechanism.

通常情况下，局域克隆多样性取决于Eriksson种苗补充机制，即已有基因型丧失和新基因型补充之间的平衡。

Lingyun Baihao variety of tea is a sexual reproduction system, a small tree-based, large-leaved type, in the species.

凌云白毫的茶树品种属有性繁殖系，属小乔木型、大叶类、中生种。

They produce no offspring of their own, one consequence of which is that populations of plants and animals capable of self-fertilisation, or "selfing", grow at twice the rate of populations that depend on sexual reproduction.

他们不会繁衍自己的后代，一个后果就是，能够自体受精的动植物数量的增长率，是依赖有性生殖的两倍。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。