The Effects of Daylength and Treatment with Gibberellic Acid on Spikelet Initiation and Development in Clipper Barley

Cottrell, Joan; Dale, J. E.; Jeffcoat, B.

doi:10.1093/oxfordjournals.aob.a086346

Cited by 29 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The possible involvement of a specific inhibitory effect not involving carbohydrate has been considered elsewhere (Cottrell et al, 1982).…”

Section: Discussionmentioning

confidence: 99%

“…Plants were grown throughout in 8 h photoperiods at 210 jitmol m~^ s~^ but half were treated with GA3 10 days after sowing (Cottrell et al, 1982). The compound was applied as a 20 JLLI aqueous droplet containing 7 jag GA3 placed over two small scratches made at the base of the adaxial surface of the fully expanded first leaf.…”

Section: Methodsmentioning

confidence: 99%

“…The number of spikelet primordia and stage of development of the most advanced spikelet were noted (Cottrell et al, 1982) for a minimum of 10 replicate spikes. The apex was then excised above the uppermost foliar primordium (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Experiments involving extension of the photoperiod with low intensity light have confirmed that these effects are primarily due to length of photoperiod rather than to effects on photosynthesis (Aspinall & Paleg, 1963;Cottrell, 1980;Cottrell, Dale & Jeffcoat, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…Gibberellin-like substances are present in higher concentrations in shoot apices of barley plants grown in long compared with short days (Nicholls & May, 1964) and application of gibberellic acid (GA3) to leaves of plants grown in short days increases the rates of both spikelet initiation and development (Nicholls, 1978;Cottrell et al, 1982). These observations have led to the view that endogenous gibberellins may be involved in mediating the effect of photoperiod (Cottrell etal, 1982).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The Effects of Photoperiod and Treatment With Gibberellic Acid on the Concentration of Soluble Carbohydrates in the Shoot Apex of Spring Barley

Cottrell¹,

Dale²

1986

New Phytologist

Self Cite

View full text Add to dashboard Cite

SUMMARYBarley plants {Hordeum vulgare L. cv. Clipper) were grown in controlled environment rooms for varying periods. The total soluble carbohydrate concentration was determined for stem apices over the period of early ear development using the p-hydroxybenzoic acid hydrazide method.Concentration of soluble carbohydrates rose during the photoperiod and was lower in the apices of plants subjected to shade. It also increased as the ear enlarged, irrespective of photoperiod. In 8 h photoperiods plants initiated many more spikelets, but at a lower rate, compared to those grown in 16 h days. Apices of plants grown in 8 h days showed a lower relative growth rate, but despite this at the end of spikelet initiation concentration of soluble carbohydrates was about 30% higher than for apices from plants in 16 h photoperiods. Where plants were grown in 8 h high intensity light followed by 8 h low intensity light soluble carbohydrate content was slightly more than in the apices of plants kept throughout 16 h in high intensity light. Treatment of plants grown in 8 h photoperiods with gibberellic acid accelerated the rates of initiation and development of spikelets. Treatment caused a substantial but ephemeral increase in soluble carbohydrate content, although by the time that spikelet initiation ceased the concentration was similar in control and treated plants.It is concluded that total soluble carbohydrate concentration in the apex is not related to either rate of initiation or rate of development of spikelets. It is suggested that rate of utilisation of available soluble carbohydrate is subject to photoperiodic control and restricts growth and development of the ear.

show abstract

“…The possible involvement of a specific inhibitory effect not involving carbohydrate has been considered elsewhere (Cottrell et al, 1982).…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effects of Photoperiod and Treatment With Gibberellic Acid on the Concentration of Soluble Carbohydrates in the Shoot Apex of Spring Barley

Cottrell¹,

Dale²

1986

New Phytologist

Self Cite

View full text Add to dashboard Cite

show abstract

The Ecological Role of Plant Growth Substances

Marinos¹

1985

Hormonal Regulation of Development III

View full text Add to dashboard Cite

Genetic insights into morphometric inflorescence traits of wheat

et al. 2019

View full text Add to dashboard Cite

Key message Modifying morphometric inflorescence traits is important for increasing grain yield in wheat . Mapping revealed nine QTL, including new QTL and a new allele for the q locus, controlling wheat spike morphometric traits . Abstract To identify loci controlling spike morphometric traits, namely spike length (SL), internode length (IL), node number per spike (NPS), and node density (ND), we studied 146 Recombinant Inbred Lines of tetraploid wheat ( Triticum turgidum L.) derived from standard spike and spike-branching mutant parents. Phenotypic analyses of spike morphometric traits showed low genetic coefficients of variation, resulting in high heritabilities. The phenotypic correlation between NPS with growing degree days (GDD) suggested the importance of GDD in the determination of node number in wheat. The major effect QTL for GDD or heading date was mapped to chromosome 7BS carrying the flowering time gene, Vrn3 - B1 . Mapping also identified nine QTL controlling spike morphometric traits. Most of these loci controlled more than a single trait, suggesting a close genetic interrelationship among spike morphometric traits. For example, this study identified a new QTL, QND . ipk - 4AL , controlling ND (up to 17.6% of the phenotypic variance), IL (up to 11% of the phenotypic variance), and SL (up to 20.8% of the phenotypic variance). Similarly, the major effect QTL for IL was mapped to the q locus. Sequencing of the Q / q gene further revealed a new q allele, q del - 5A , in spike-branching accessions possessing a six base pair deletion close to the miR172 target site. The identification of q del - 5A suggested that the spike-branching tetraploid wheats are double mutants for the spikelet meristem (SM) identity gene, i.e., branched head t ( TtBH t ), and the q gene, which is believed to be involved in the SM indeterminacy complex in wheat. Electronic supplementary material The online version of this article (10.1007/s00122-019-03305-4) contains supplementary material, which is available to authorized users.

show abstract

The Effects of Daylength and Treatment with Gibberellic Acid on Spikelet Initiation and Development in Clipper Barley

Cited by 29 publications

References 0 publications

The Effects of Photoperiod and Treatment With Gibberellic Acid on the Concentration of Soluble Carbohydrates in the Shoot Apex of Spring Barley

The Effects of Photoperiod and Treatment With Gibberellic Acid on the Concentration of Soluble Carbohydrates in the Shoot Apex of Spring Barley

The Ecological Role of Plant Growth Substances

Genetic insights into morphometric inflorescence traits of wheat

Contact Info

Product

Resources

About