Integration of Environment, Physiology and Fruit Abscission via Carbon Balance Modeling - Implications for Understanding Growth Regulator Responses

Lakso, Alan N.; Robinson, Terence L.; Greene, Duane W.

doi:10.17660/actahortic.2006.727.38

Cited by 40 publications

(42 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the current hypotheses explaining at least part of the abscission of young fruits is deWcit in the supply of assimilate to young developing fruits, resulting in abscission of weaker fruit (Bangerth 2000). This is supported by the high correlation of model estimates of carbohydrate balance and the sensitivity to chemical thinners (Lakso et al 2006) during a time in which carbon deWcits in the tree are the greatest (Lakso et al 1999). Also, we have found in preliminary unpublished studies that shade eVects on fruit drop can be reversed with trunk injections of sorbitol, the primary translocated photosynthate in apple (Loescher et al 1982).…”

Section: Discussionmentioning

confidence: 53%

See 1 more Smart Citation

Isolation and characterization of genes associated with shade-induced apple abscission

et al. 2008

View full text Add to dashboard Cite

Apple trees generally produce excessive number of flowers and young fruitlets, which negatively affects commercial value. Thus, thinning is an important practice by which excessive flowers and fruitlets abort. Fruit abscission is difficult to predict or control, as many factors including shading can cause fruitlets to abort. In order to understand the molecular basis of shade-induced fruit abscission, two cDNA libraries were constructed using the suppression-subtractive hybridization (SSH) method and 347 expressed sequence tags (ESTs) were obtained. 168 ESTs represent transcripts that are preferentially expressed after 24 h of shading, and the other 179 are derived from RNAs of small apple fruits that were shaded for 72 h. Sequence analyses revealed that these clones represent 68 (24 h) and 44 (72 h) unique genes; these genes belong in eight functional categories. The largest set of genes is related to carbohydrate metabolism including the sorbitol 6-phosphate dehydrogenase (S6PDH) gene that was generally believed not to be expressed in young fruits, while the second largest group contains unclassified or unknown genes. RNA gel blot analysis confirmed that at least 26 genes are up-regulated after shade treatment. Some of these known genes may serve as molecular markers for apple monitoring the induction of fruitlet abscission. Improved genetic understanding is critical to the development of targeted abscission agents to better control apple crop loads and optimize apple production.

show abstract

Section: Discussionmentioning

confidence: 53%

“…The model demonstrated that particularly good carbon supply status correlated with less-than-average response to a chemical thinner and vice versa (Lakso et al 2006), further suggesting that carbon metabolism may be a key aspect, and possibly an integrator, of fruit abscission.…”

Section: Introductionmentioning

confidence: 90%

Isolation and characterization of genes associated with shade-induced apple abscission

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Differences in soil water availability among GMSs can influence fruit tree growth and yields Hogue and Neilsen, 1987;. Trees subjected to water stress may have reduced photosynthetic capacity and restricted carbohydrate supply for growth (Lakso et al, 2005). In our study, irrigation was provided whenever there were extended dry periods, and root-zone soil water content was monitored continuously with time-domain reflectrometry probes, which showed few consistent trends or differences in soil water availability among GMS treatments from 1997 to 2007 (data not shown).…”

Section: Discussionmentioning

confidence: 74%

Long-term Effects of Four Groundcover Management Systems in an Apple Orchard

Atucha¹,

Merwin²,

Brown³

2011

horts

View full text Add to dashboard Cite

Groundcover management systems (GMSs) are essential for fruit production, but very few long-term studies have evaluated orchard GMS sustainability. We evaluated four GMSs—pre-emergence soil-active herbicides (PreHerb), post-emergence herbicide (PostHerb), a turfgrass cover crop (Sod), and hardwood bark mulch (Mulch)—in an apple (Malus domestica Borkh.) orchard over 16 years of continuous observation. There were no consistent long-term trends in fruit yields among GMSs, although during the first 5 years, yields were lower in trees on Sod. Tree growth was greater in PostHerb and Mulch than in Sod during the first 5 years, and during the next decade, trees in Mulch plots were consistently larger than in other GMSs. Total soil nitrogen (N) and carbon (C) content, C-to-N ratios, and essential plant nutrients were much greater in the Mulch soil after 16 years of treatments. Long-term responses of trees to groundcover vegetation indicated that apple trees respond adaptively to compensate for weed and grass competition. Year-round elimination of surface vegetation with residual soil active herbicides may be unnecessary or even detrimental for orchard productivity and soil fertility in established orchards. Post-emergence herbicides that reduce weed competition primarily during the summer months may offer an optimal combination of weed suppression and soil conservation.

show abstract

“…This might be due to favourable climatic conditions (Fig. 2) after thinning which enabled good carbohydrate supply of fruits and more resistance of fruits to NAA (Lakso and Robinson, 2015;Lakso et al, 2006;Robinson et al, 2016;Schröder and Bangerth, 2006).…”

Section: Resultsmentioning

confidence: 99%

Timing and rates of application of NAA as blossom and fruitlet chemical thinner on apple cv. and #712;Braeburn and #712;

Fruk

Vukovi

Jatoi

et al. 2017

Emir. J. Food Agric

View full text Add to dashboard Cite

Integration of Environment, Physiology and Fruit Abscission via Carbon Balance Modeling - Implications for Understanding Growth Regulator Responses

Cited by 40 publications

References 0 publications

Isolation and characterization of genes associated with shade-induced apple abscission

Isolation and characterization of genes associated with shade-induced apple abscission

Long-term Effects of Four Groundcover Management Systems in an Apple Orchard

Timing and rates of application of NAA as blossom and fruitlet chemical thinner on apple cv. and #712;Braeburn and #712;

Contact Info

Product

Resources

About