Paper Information

Title: 

THE EFFECT OF LIGHT ON GERMINATION OF ENCAPSULATED AND INTACT SEEDS OF RAPISRTUM RUGOSUM

Type: PAPER
Author(s): OHADI SARA,R.MASHHADI HAMID,BEHESHTIAN MESGARAN MOHSEN
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

LIGHT IS ONE OF THE IMPORTANT FACTORS FOR WEED SEEDS GERMINATION. IT IS ALSO CONSIDERED AS A DORMANCY BREAKING FACTOR. TO EVALUATE THE EFFECT OF LIGHT ON GERMINATION OF RAPISTRUM RUGOSUM SEEDS, AN EXPERIMENT WAS CONDUCTED AT THE LABORATORY OF DEPARTMENT OF AGRONOMY AND PLANT BREEDING, UNIVERSITY OF TEHRAN IN 2006. SEEDS OF R. RUGOSUM (WITH AND WITHOUT SILLIQUES) WERE KEPT IN DIFFERENT STORAGE CONDITIONS INCLUDING ROOM TEMPERATURE (25±3 0C), COLD (30C), AND THREE DEPTHS IN SOIL (10, 20, 40 CM UNDER IRRIGATED AND NON IRRIGATED CONDITIONS) FOR ONE YEAR. SEEDS WERE EXHUMED EVERY 2 MONTHS AND TESTED FOR THEIR GERMINATION RESPONSES TO LIGHT. SEEDS VIABILITY WAS ALSO EXAMINED BY TETRAZOLIUM CHLORIDE. RESULTS SHOWED THAT BOTH STORAGE CONDITIONS AND LIGHT AFFECTED THE GERMINATION OF SEEDS. SEEDS OF R. RUGOSUM HAD A DUAL RESPONSE TO LIGHT DEPENDING TO THE STORAGE CONDITIONS. WHEN KEPT UNDER INDOOR CONDITIONS, SEEDS GERMINATED MORE IN DARKNESS THAN LIGHT. HOWEVER, SEEDS WITH SILLIQUES THAT WERE BURIED IN THE SOIL SHOWED A POSITIVE RESPONSE TO LIGHT AND THOSE WITHOUT SILLIQUES GERMINATED INDIFFERENTLY IN LIGHT OR DARKNESS. GERMINATION OF SEEDS WITHOUT SILLIQUES WAS MORE THAN 80% IN MOST TREATMENTS; HOWEVER PERCENT GERMINATION WAS LESS THAN 20% FOR SEED WITH SILLIQUES. SEEDS SEPARATED FROM SILLIQUES HAD LOWER VIABILITY THAN INTACT SILLIQUES IN MOST STORAGE CONDITIONS INDICATING THE ROLE OF FRUIT PROTECTION TISSUES AGAINST NATURAL HAZARDS.

 
Keyword(s): SILLIQUE, LIGHT, STORAGE CONDITIONS, GERMINATION
 
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