Temperature - seed dormancy, Biology

Assignment Help:

Temperature - Seed Dormancy

Low temperature treatment is an essential prelude to germination in many seeds, and high temperature may be inhibitory at the time of germination. The low temperature chilling requirement is frequently met artificially by the process of stratification. The seeds are layered in trays in cold moist air for a period of several weeks or months. Temperatures between 0 and 10?C are most effective. The chilling requirement is variously located in the embryo or the seed coat, sometimes in both. The chilling requirement of apple seeds, for example, is much longer for intact seeds than for seeds with the coats removed, or for isolated embryos. Red light and GA have a synergistic effect, that is, the combination of both factors stimulates germination more than the sum of the two separately.


Related Discussions:- Temperature - seed dormancy

Cultured plant cells, Cultured plant cells: Cultured plant cells are re...

Cultured plant cells: Cultured plant cells are recognized to give biochemicals of interest since  1950's , but starting the yields were very low. Refined culture structures hav

What''s the difference between heterozygosity & homozygosity, What is the d...

What is the difference between heterozygosity and homozygosity? The Homozygosity occurs when an individual has two identical alleles of a gene, for instance, AA or aa. The Het

Annelids - regeneration in invertebrates, Annelids - Regeneration in Invert...

Annelids - Regeneration in Invertebrates Between the segmented worms both the polychaetes and oligochaetes have remarkable powers of regeneration. Leeches totally lack this ca

What are passive and active immunization, What are passive and active immun...

What are passive and active immunization? According to the duration of the protection how do these types of immunization differ? Active immunization is that in which an antigen

Evaluating the degree of urinary obstruction, Evaluating the degree of urin...

Evaluating the degree of urinary obstruction: D.P. is a 63-year-old man who has been experiencing progressive difficulty with initiating the urinary stream and frequently needs to

Exon, Exon are those parts of a genomic DNA sequence which will be represe...

Exon are those parts of a genomic DNA sequence which will be represented in final, mature mRNA t A contiguous segment of the genomic DNA which codes for a polypeptide in the gene.

Anti-malarial drugs kill the parasites in the blood, (a) Anti-malarial drug...

(a) Anti-malarial drugs kill the parasites in the blood but they do not cure the disease.Why is this? (b) Why was the use of DDT insecticide not successful in eradicating mal

Why in the preparation of a karyotype analysis, Why in the preparation of a...

Why in the preparation of a karyotype analysis is the use of a substance like colchicine interesting? The Colchicine is a substance that disallows the formation of microtubules

Describe pharmacologic agents in amyl nitrite, Describe Pharmacologic Agent...

Describe Pharmacologic Agents in amyl nitrite ? Amyl Nitrite : It produces vasodilatation which initially results in marked fall in BP and in the next 30-60 seconds there is

Define age as a determinants of nutrient requirements, Define Age as a dete...

Define Age as a determinants of nutrient requirements? Age: Requirements change with increasing age between birth and maturity. Nutrient requirements per unit body weight are h

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