| 1. | It is concluded that eth perform its action on gravitropism through the regulation of both iaa contents and iaa polar transportation
上述两方面结果揭示：在向重力性反应中， eth是通过调节iaa的水平和iaa极性运输两种机制起作用的。 |
| 2. | Recent advance in molecular biology , associated with the adoption of the mutants have allowed major breakthroughs in our understanding of both root and shoot gravitropism
随着突变体和分子生物学技术的应用，生长素( auxin )在向重力性反应中的中心作用已被确认。 |
| 3. | Gravitropism is very important for plant to take up the water , mineral ions and to harvest light , which are necessary for growth and development
植物向重力性反应对其生长发育有着重要的生理作用，直接影响到植物体从外界获得水分、矿物质及光能等生长必需物质。 |
| 4. | So extremely probably , eth affects the gravitropism via auxin . in this case , such mutants might be used as the ideal model plants for the study of the closs - talk between eth and auxin
因此， eth有可能通过调控auxin这个中心因素来影响向重力性反应，这些乙烯突变体极可能成为研究eth对auxin作用的理想模式材料。 |
| 5. | Now , it is confident that auxin plays the central role in regulating the gravitropism in plants . it has been discovered that the gravitropism had changed in some mutants on eth biosynthesis or signaling
我们和其他学者在对乙烯( eth )的一系列突变体的研究中发现，某些乙烯合成或响应的突变体其向重力性反应也发生改变。 |
| 6. | Insensitivity to eth ( in eir1 - 1 root and etr1 - 3 ) led to the impossibility of iaa transportion from shoot tip to shoot bottom or root , so that result in the diminishment of root gravitropism
这种表型上的差异表明：高水平的eth加强了根的正向重力性反应； eth信号转导的阻断引起根的正向重力性及茎的负向重力性减弱或消失。 |
| 7. | In our experiments , however , the inhibition of flavonoid on root system development is related to high nitrate , and quercetin , one kind of flavonoid , does not inhibit but promotes the gravitropism instead
但我们在实验中发现，类黄酮对根系发生的抑制是与高n相联系的。对于向地性，类黄酮中的一种? ? quercetin不但不抑制，反而促进向地性? ?诱导超向地性。 |
| 8. | On the one hand , quercetin promotes hypocqtyls phototropic growth , on the other hand , it promotes gravitropism of root tips . when the seedlings are placed tilted at 80 , quercetin induces root tips getting into medium , while on control case , it grows along the surface
一方面q促进了下胚轴的向光生长，另一方面，促进了根尖的向地性，在80培养时， q诱导根尖钻入培养基中。 |
| 9. | The iaa contents in shoots and roots of 12 - d - old seedlings of arabidopsis wt and mutants were assayed . high eth level ( in eto1 - 1 ) showed the promotion of iaa synthesis or inhibition of the iaa catabolism , thus improves the root gravitropism
从12d龄拟南芥幼苗的形态学表现上看， etol - 1根的向重力性与wt相比明显增强了，而eirl - 1和etrl - 3的向重力性则明显减弱，黄化的etrl - 3茎的负向重力性也减弱。 |
| 10. | Lateral root development and gravitropism are regulated by polar auxin transport ( pat ) , and auxin efflux inhibitors ( aei ) inhibit lr growth and tropism . because of > the structural similarity to pat inhibitor npa , flavonoid has long been regarded as endogenous polar auxin transport inhibitor
生长素极性运输( polarauxintransport , pat )对侧根发生和根尖向地性起着重要的调节作用，添加外源生长素极性运输抑制剂不仅抑制了侧根发生，同时还使根尖丧失了向地性。 |
