查询词典 tetraploid

It is very difficult to breed a new variety, because the traditional breeding methods have been limited by resources quantity. Tetraploid Chinese cabbage has double germ plasms and high resistance, it can produce abundant resources that benefits breeding new varieties.

大白菜传统育种方法受到资源数量所限，品种选育难度持续增大，四倍体大白菜因基因型丰富、剂量高、抗性强、资源范围广，利于新优品种选育。

If, however, the root cell is one of the rare tetraploid cells (a cell having four sets of chromosomes that arise spontaneously in the root), it may develop into a nodule.

如果这个根细胞是罕见的四倍体细胞（一种在根部自然拥有四套染色体的细胞），它就可能生长成为根瘤。

Effects of different concentrations of exogenous SOD on antioxidant enzyme activities and sugar contents in leaf and fruit were studied, taking tetraploid plant in Vitis vinifera cv 'Muscat humburg' as materials and water treatment as the CK.

以四倍体玫瑰香葡萄为试材，以喷清水为对照，探讨了不同浓度外源SOD对叶片、果实抗氧化酶活性和含糖量的影响。

In grain-filling stage, the qP values of evolutionary wheats decreased under water stress, while Shan253 and Changwu134 hadn't decreased, indicated that the effect of water stress on the re-oxidation in Q-A of modern wheat was slight, while before this stage, the electron transport from PSⅡto QA restrained by water stress was main factor of photosynthesis non-stomata limitation to modern wheat; The qNP values of hexaploid were higher than diploid and tetraploid wheat, indicated that the ability of using light energy

随小麦由二倍体向四倍体、六倍体及现代小麦进化，表观电子传递速率有增大趋势，其受水分胁迫影响的程度在花前期有加剧趋势，花前期栽培一粒、栽培二粒、普通小麦、陕253和长武134这五种小麦在水分胁迫下表观量子产额的降幅分别为5%、7.47%、14.29%、33.3%和53.49%，光饱和Pn的降幅分别为8.8%、26.14%、23.25%、44.22%和51.29%，光饱和点整体上也是下降的，且这三个指标的降幅随进化程度提高有增大趋势，表明小麦在进化过程中能量转换系统受水分胁迫影响的程度加剧；而在水分胁迫下，小麦的羧化效率和RuBP再生速率也均下降，下降的程

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。