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Paper Information

Title: 

A TRADE-OFF BETWEEN LIGHT INTENSITY AND EXPOSURE DURATION IN SEED GERMINATION OF POA ANNUA AND PHALARIS MINOR

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: 

THE EFFECT OF LIGHT QUALITY ON WEED SEEDS GERMINATION HAS BEEN STUDIED WELL; HOWEVER, LITTLE IS KNOW ABOUT THE QUANTITATIVE CHARACTERISTICS OF LIGHT (E.G. INTENSITY AND DURATION) IN THIS REGARD. THUS, EXPERIMENTS WERE CONDUCTED TO DETERMINE THE EFFECT OF LIGHT INTENSITY AND EXPOSURE DURATION ON SEED GERMINATION OF LITTLE CANARY GRASS (PHALARIS MINOR) AND ANNUAL BLUE GRASS (POA ANNUA). SEEDS OF BOTH SPECIES WERE INITIALLY PHOTOSENSITIZED BY TWO MONTHS BURIAL IN THE SOIL. IMBIBED SEEDS WERE THEN EXPOSED TO LIGHT INTENSITIES OF 130, 250, 500 AND 1000 MMOLM-2S-1 EACH AT EXPOSURE DURATIONS OF 0.1, 1, 10, 100, 1000 AND 10000 S. SEEDS WERE COUNTED 14 D AFTER INCUBATION. THE EFFECTS OF LIGHT INTENSITY AND DURATION AND THEIR INTERACTION ON SEED GERMINATION OF BOTH WEEDS WERE SIGNIFICANT. INCREASING EXPOSURE DURATION UP TO 100 S INCREASED THE GERMINATION OF BOTH WEEDS TO THE HIGHEST PERCENTAGE WHILE LIGHT INTENSITIES GREATER THAN 1000 S RESULTED IN GERMINATION DECLINATION FOR EITHER OF SPECIES. RESULTS REVEALED A TRADE-OFF BETWEEN LIGHT INTENSITY AND DURATION WHERE A HIGH LIGHT INTENSITY IRRADIATED AT SHORT TIME EXPOSURE MAY RESULT IN THE SAME PERCENT GERMINATION AS THE ONE WITH A LOW LIGHT INTENSITY BUT AT LONGER EXPOSURE DURATION.

 
Keyword(s): SEED GERMINATION, PHOTOSENSITIVITY, TRADE-OFF
 
 
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