Articles
CHEMICAL TREATMENTS ENHANCE SEED GERMINATION IN PERIDERIDIA GAIRDNERI
Article number
618_56
Pages
477 – 482
Language
English
Abstract
Seeds of Perideridia gairdneri or yampa, exhibit dormancy that inhibits germination.
In 2001 we determined that yampa seeds need 4 to 5 months of moist stratification at 3°C to germinate.
Germination percentages in this stratification treatment though were low.
The objective of this study was to enhance germination of yampa by seed grading and various chemical treatments known to stimulate germination in other species.
In September 2001, yampa seeds were collected from a native population in northern Utah.
Seeds were graded by size and tetrazolium tests were performed on a portion of the seeds to assess viability.
Seeds were stratified in petri dishes on moist filter paper at 3°C for 5 months.
Seed treatments were applied during or after stratification and included controls and various chemicals at different concentrations: KNO3 at 0.01 M and 0.05 M, GA3 at 0.03 mM and 0.30 mM, and Ethephon at 1.0 mM and 2.0 mM. Each treatment consisted of 3 replications of 25 seeds.
After stratification, seeds were placed in a controlled 8°C (day/night) environment and germination was observed daily.
Tetrazolium testing indicated a positive relationship between seed size and viability.
Germination data also showed this correlation with small seeds germinating at a lower percentage than the large and medium seeds.
Chemical and hormonal seed treatments had variable effects on germination.
Hormonal treatments increased germination percentages when compared to KNO3 and controls.
The higher concentrations of KNO3 inhibited germination whether applied before or after stratification.
In 2001 we determined that yampa seeds need 4 to 5 months of moist stratification at 3°C to germinate.
Germination percentages in this stratification treatment though were low.
The objective of this study was to enhance germination of yampa by seed grading and various chemical treatments known to stimulate germination in other species.
In September 2001, yampa seeds were collected from a native population in northern Utah.
Seeds were graded by size and tetrazolium tests were performed on a portion of the seeds to assess viability.
Seeds were stratified in petri dishes on moist filter paper at 3°C for 5 months.
Seed treatments were applied during or after stratification and included controls and various chemicals at different concentrations: KNO3 at 0.01 M and 0.05 M, GA3 at 0.03 mM and 0.30 mM, and Ethephon at 1.0 mM and 2.0 mM. Each treatment consisted of 3 replications of 25 seeds.
After stratification, seeds were placed in a controlled 8°C (day/night) environment and germination was observed daily.
Tetrazolium testing indicated a positive relationship between seed size and viability.
Germination data also showed this correlation with small seeds germinating at a lower percentage than the large and medium seeds.
Chemical and hormonal seed treatments had variable effects on germination.
Hormonal treatments increased germination percentages when compared to KNO3 and controls.
The higher concentrations of KNO3 inhibited germination whether applied before or after stratification.
Authors
N. Phillips, D. Drost, V. Varga
Keywords
gibberellic acid, stratification, yampa, seed viability, ethylene
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