Paper Information

Title: 

SEED GERMINATION AND SEEDLING EMERGENCE OF DODDER (CUSCUTA MONOGYNA L.)

Type: PAPER
Author(s): EBRAHIMI ESMAIL,ESLAMI SEYED V.
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

DODDER (CUSCUTA MONOGYNA) IS A PARASITE OF STEM AND LEAF OF TREES SUCH AS GRAPES, POMEGRANATE, ELM AND CITRUS FRUITS. LABORATORY EXPERIMENTS WERE CONDUCTED TO STUDY DODDER SEED DORMANCY, GERMINATION AND SEEDLING EMERGENCE OF DODDER. HOT WATER, SCARIFICATION WITH SANDPAPER AND SULFURIC ACID (96%) SHOWED THE GREATEST EFFECT ON BREAKING DORMANCY OF DODDER SEEDS, WHILE THE LEAST INFLUENCE ON SEED DORMANCY WAS OBTAINED BY APPLYING CHILLING, AND SOAKING IN WATER FOR 36 HOURS. SEEDS OF THIS PARASITE WEED RETAINED THEIR GERMINATION ABILITY UNTIL HIGH SALINITY LEVELS AND EVEN AT 320 MM NACL 66.67% OF SEEDS GERMINATED, HOWEVER, GERMINATION COMPLETELY INHIBITED AT 640_MM_NACL. ALTHOUGH GERMINATION WAS GREATER THAN 80% UNTIL OSMOTIC POTENTIAL OF -0.4 MPA, FURTHER DECREASING OF OSMOTIC POTENTIAL RESULTED IN A SHARP DECLINE OF GERMINATION, SO THAT IT DECREASED TO 20% AT OSMOTIC POTENTIAL OF -0.8 MPA AND NO SEED GERMINATED AT OSMOTIC POTENTIAL OF -1MPA. SEED BURIAL DEPTH GREATLY INFLUENCED SEEDLING EMERGENCE, SO THAT NO SEEDLING EMERGED FROM SEEDS BURIED DEEPER THAN 2 CM AND MAXIMUM EMERGENCE (100%) WAS OBSERVED FROM SEEDS SOWN ON THE SOIL SURFACE WITH TWO LAYERS OF FILTER PAPER, INDICATING THAT NO-TILL PRACTICES OR MINIMUM TILLAGE INCREASES SEEDLING EMERGENCE OF THIS SPECIES.

 
Keyword(s): CUSCUTA MONOGYNA, GERMINATION AND EMERGENCE, SALT AND DROUGHT STRESS, BURIAL DEPTH
 
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