Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed

Dissanayake, P., George, D. L. and Gupta, M. L. (2010) Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed. Industrial Crops and Products, 32 2: 111-117. doi:10.1016/j.indcrop.2010.03.012


Author Dissanayake, P.
George, D. L.
Gupta, M. L.
Title Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed
Formatted title
Effect of light, gibberellic acid and abscisic acid on germination of guayule (Parthenium argentatum Gray) seed
Journal name Industrial Crops and Products   Check publisher's open access policy
ISSN 0926-6690
1872-633X
Publication date 2010-09
Sub-type Article (original research)
DOI 10.1016/j.indcrop.2010.03.012
Volume 32
Issue 2
Start page 111
End page 117
Total pages 7
Place of publication Washington D C, United States
Publisher Elsevier
Collection year 2011
Language eng
Formatted abstract
Guayule (Parthenium argentatum Gray) produces high quality, low-allergenic rubber which has commercial potential. The species has small seeds with a high level of dormancy which was investigated in a series of germination experiments. Many researchers have investigated the effect of gibberellic acid and light on guayule seed dormancy but there have been no reports on light quality. In this study, increased germination was found for yellow (82.0%) and red (65.3%) light compared to green (55.3%) and blue (25.3%) light. Effect of light quality indicates evidence of phytochrome-mediated germination and dormancy in guayule. A higher ratio of red to far-red radiation in yellow and red light activates phytochrome that stimulates production of endogenous gibberellins to promote germination. The highest level of far-red radiation found in blue light had similar inhibitory effects as complete darkness (21.3%). An intermediate level of red to far-red radiation for green light produced intermediate germination. Seed coat and light also affected germination of freshly harvested guayule seed. Embryos responded to light compared with darkness (68.0% vs. 34.7%) albeit to a much lower level than intact seed (57.3% vs. 8.6%) indicating the possible presence of inhibitors in the seed coat. Light and GA3 strongly interact to overcome dormancy in guayule and appear to act on the same pathway. The optimum concentration of GA3 for seed used in this experiment ranged from 250 to 500ppm. © 2010 Elsevier B.V.
Keyword Guayule
Dormancy
Light quality
Gibberellic acid
Abscisic acid
Seed coat
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Sun, 11 Jul 2010, 00:05:23 EST