Root - plant growth substances, Biology

Assignment Help:

Root - Plant Growth Substances

Induction of roots by auxins in stem cuttings is a well known phenomenon. The concentrations needed are much lower as compared to that which promotes shoot growth. Auxins also induce lateral root growth at lower concentrations. High concentrations of auxins are inhibitory to root growth. The auxin transport is basipetal in nature. Produced in shoot apex and lateral active shoot buds-auxins percolate towards roots. Obviously, the concentrations that reach roots are low.

The presence of cytokinins is a must for promotion of cell division in root tips. Cytokinins also interact with auxins in the cellular differentiation to produce roots and shoots. Gibberellins do not seem to be having much role in root growth. Ethylene plays vital role in affecting the nastic responses and geotropism. It also promotes dormancy in buds.


Related Discussions:- Root - plant growth substances

Helobial type - endosperm, Helobial Type - Endosperm This type of endo...

Helobial Type - Endosperm This type of endosperm is intermediate between the nuclear and the cellular types. The division of the primary endosperm nucleus is followed by the f

Explain about natural pigments, Explain about natural pigments There ha...

Explain about natural pigments There has been an extensive search of the microbial, plant and animal kingdoms for pigments that possess both high tinctorial power/strength (a m

Define protein concentrates, Define Protein Concentrates, Isolates and Hydr...

Define Protein Concentrates, Isolates and Hydrolysates? The first question that may come to your mind is why do we need to concentrate or isolate a protein from a product? The

Explain the genetically-modified brinjal developed for, The genetically-mod...

The genetically-modified (GM) brinjal in India has been developed for: 1. Insect-resistance 2. Enhancing shelf life 3. Enhancing mineral content 4. Drought-resistance

Define effect of nutrition on the immune system, Define Effect of Nutrition...

Define Effect of Nutrition on the Immune System? Nutrition has a strong influence on the immune system of the elderly. Ageing induces dysregulation of the immune system, mainly

Express rate of mutation of a given species, Select all of the correct/true...

Select all of the correct/true answers. The rate of mutation of a given species can be predicted. Mutations are a source of new alleles and contribute to the biodiversity present o

Impact of user charges or fees, Normal 0 false false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Indications for surgery-mixed tricuspid stenosi , Indications for Surgery: ...

Indications for Surgery:  In a mixed lesion, either regurgitation or stenosis may be dominant and decision of surgery depends on the haemodynarnics. At the time of surgery on othe

Explain about the glycemia or insulinemia, Explain about the Glycemia or In...

Explain about the Glycemia or Insulinemia? Preliminary research evidence indicates that there may be beneficial effects in terms of decreased fasting blood glucose/hepatic gluc

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd