Afforestation of Mongolian steppe: patterns of biomass partitioning in Populus sibirica and Ulmus pumila trees in response to management supporting measures

2021 ◽  
pp. 1-13
Author(s):  
Ser-Oddamba Byambadorj ◽  
Batkhuu Nyam-Osor ◽  
Byung Bae Park ◽  
Tseepil Avirmed ◽  
Gabriella Stefania Scippa ◽  
...  
Keyword(s):  
Biomass Partitioning ◽  
Ulmus Pumila

The Microscopy of Compatibility and Incompatibility in Ulmus

1985 ◽  
Vol 43 ◽  
pp. 504-505
Author(s):  
B. L. Redmond ◽  
Christopher F. Bob
Keyword(s):  
Dutch Elm Disease ◽  
Economic Losses ◽  
Hybrid Progeny ◽  
Ulmus Pumila ◽  
Ulmus Americana ◽  
American Elm ◽  
Asian Species ◽  
Ulmus Parvifolia ◽  
Initial Appearance ◽  
Chinese Elm

The American Elm (Ulmus americana L.) has been plagued by Dutch Elm Disease (DED), a lethal disease caused by the fungus Ceratocystis ulmi (Buisman) c. Moreau. Since its initial appearance in North America around 1930, DED has wrought inexorable devastation on the American elm population, triggering both environmental and economic losses. In response to the havoc caused by the disease, many attempts have been made to hybridize U. americana with a few ornamentally less desirable, though highly DED resistant, Asian species (mainly the Siberian elm, Ulmus pumila L., and the Chinese elm Ulmus parvifolia Jacq.). The goal is to develop, through breeding efforts, hybrid progeny that display the ornamentally desirable characteristics of U. americana with the disease resistance of the Asian species. Unfortunately, however, all attempts to hybridize U. americana have been prevented by incompatibility. Only through a firm understanding of both compatibility and incompatibility will it be possible to circumvent the incompatibility and hence achieve hybridization.

scholarly journals Potassium Application Positively Modulates Physiological Responses of Cocoa Seedlings to Drought Stress

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 563
Author(s):  
Esther Anokye ◽  
Samuel T. Lowor ◽  
Jerome A. Dogbatse ◽  
Francis K. Padi
Keyword(s):  
Water Stress ◽  
Soil Water ◽  
Chlorophyll Content ◽  
Electrolyte Leakage ◽  
Seedling Survival ◽  
Biomass Accumulation ◽  
Biomass Partitioning ◽  
Chlorophyll Content And Fluorescence ◽  
Physiological Functions ◽  
Soil Water Stress

With increasing frequency and intensity of dry spells in the cocoa production zones of West Africa, strategies for mitigating impact of water stress on cocoa seedling survival are urgently required. We investigated the effects of applied potassium on biomass accumulation, physiological processes and survival of cocoa varieties subjected to water stress in pot experiments in a gauzehouse facility. Four levels of potassium (0, 1, 2, or 3 g/plant as muriate of potash) were used. Soil water stress reduced plant biomass accumulation (shoot and roots), relative water content (RWC), chlorophyll content and fluorescence. Leaf phenol and proline contents were increased under water stress. Additionally, compared to the well-watered conditions, soils under water stress treatments had higher contents of exchangeable potassium and available phosphorus at the end of the experimental period. Potassium applied under well-watered conditions reduced leaf chlorophyll content and fluorescence and increased leaf electrolyte leakage, but improved the growth and integrity of physiological functions under soil water stress. Potassium addition increased biomass partitioning to roots, improved RWC and leaf membrane stability, and significantly improved cocoa seedling survival under water stress. Under water stress, the variety with the highest seedling mortality accumulated the highest contents of phenol and proline. A significant effect of variety on plant physiological functions was observed. Generally, varieties with PA 7 parentage had higher biomass partitioning to roots and better seedling survival under soil moisture stress. Proportion of biomass partitioned to roots, RWC, chlorophyll fluorescence and leaf electrolyte leakage appear to be the most reliable indicators of cocoa seedling tolerance to drought.

scholarly journals Coupled whole‐tree optimality and xylem‐hydraulics explain dynamic biomass partitioning

2021 ◽  
Author(s):  
Aaron Potkay ◽  
Anna T. Trugman ◽  
Yujie Wang ◽  
Martin D. Venturas ◽  
William R.L. Anderegg ◽  
...  
Keyword(s):  
Biomass Partitioning ◽  
Whole Tree

Sand Abrasion Injury and Biomass Partitioning in Cotton Seedlings

2009 ◽  
Vol 101 (6) ◽  
pp. 1297-1303 ◽  
Author(s):  
Jeffrey T. Baker ◽  
Bobbie McMichael ◽  
John J. Burke ◽  
Dennis C. Gitz ◽  
Robert J. Lascano ◽  
...  
Keyword(s):  
Biomass Partitioning ◽  
Sand Abrasion

scholarly journals Biomass Partitioning and Its Relationship with the Environmental Factors at the Alpine Steppe in Northern Tibet

PLoS ONE ◽  
2013 ◽  
Vol 8 (12) ◽  
pp. e81986 ◽  
Author(s):  
Jianbo Wu ◽  
Jiangtao Hong ◽  
Xiaodan Wang ◽  
Jian Sun ◽  
Xuyang Lu ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Biomass Partitioning ◽  
Northern Tibet ◽  
Alpine Steppe

PHYSIOLOGICAL BASIS OF YIELD VARIATION OF TEA (CAMELLIA SINENSIS) DURING DIFFERENT YEARS OF THE PRUNING CYCLE IN THE CENTRAL HIGHLANDS OF SRI LANKA

2009 ◽  
Vol 45 (4) ◽  
pp. 429-450 ◽  
Author(s):  
W. A. J. M. DE COSTA ◽  
D. M. S. NAVARATNE ◽  
A. ANANDACOOMARASWAMY
Keyword(s):  
Harvest Index ◽  
Biomass Partitioning ◽  
Sink Strength ◽  
Down Regulation ◽  
Physiological Basis ◽  
Area Index ◽  
Yield Decline ◽  
Yield Variation ◽  
Shoot Number ◽  
Significant Yield

SUMMARYThe objective of this study was to elucidate the physiological basis of the significant yield decline that occurs during the fourth year of the pruning cycle of tea. Biomass partitioning, which was hypothesized to be a major factor in causing this yield decline, was measured by destructive harvests of entire tea bushes, in two contrasting, mature, field-grown tea cultivars (TRI 2025 and DT1) at the end of different years of the pruning cycle. In both cultivars, yield showed continuous increases from year 1 to 3, followed by reductions of 44% and 35% in TRI2025 and DT1 respectively in the fourth year. Patterns of biomass partitioning to roots, stems or branches did not correlate with the above yield variation whereas harvest index, canopy leaf area index and mature leaf dry weight showed variations which paralleled the yield variation. The fourth-year decline in harvest index was brought about by reductions in both shoot number per m2 and mean individual shoot weight, which indicate a reduction in sink strength. Both cultivars showed reductions in light-saturated photosynthetic rate of maintenance foliage during the second half of the pruning cycle, indicating reduced source capacity. Hence, a combined reduction of both sink strength and source capacity during the fourth year could have brought about the significant yield reduction in tea. A significant increase of root starch in the fourth year indicated a down-regulation of physiological activities of the bush towards the end of the pruning cycle. Mechanisms responsible for this down-regulation need to be elucidated by further research.

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