No evidence of positive feedback between litter deposition and seedling growth rate in Neotropical savannas

2021 ◽  
Author(s):  
André M. D’Angioli ◽  
Vinicius L. Dantas ◽  
Marcio Lambais ◽  
Patrick Meir ◽  
Rafael S. Oliveira
Keyword(s):  
Growth Rate ◽  
Seedling Growth ◽  
Positive Feedback ◽  
Seedling Growth Rate ◽  
Neotropical Savannas ◽  
Litter Deposition

Physiological trade-offs associated with methyl jasmonate - induced resistance in Pinus radiata

2008 ◽  
Vol 38 (4) ◽  
pp. 677-684 ◽  
Author(s):  
Nick Gould ◽  
Tony Reglinski ◽  
Mike Spiers ◽  
Joe T. Taylor
Keyword(s):  
Growth Rate ◽  
Disease Resistance ◽  
Methyl Jasmonate ◽  
Water Potential ◽  
Seedling Growth ◽  
Pinus Radiata ◽  
Transpiration Rate ◽  
Meja Treatment ◽  
Seedling Growth Rate ◽  
The Impact

Methyl jasmonate (MeJA) can induce defence responses in plants to pathogen attack, but it can also have consequences for plant growth. The transient effects of exogenous MeJA treatment on the resistance of Monterey pine ( Pinus radiata D. Don) seedlings to Diplodia pinea (Desm.) Kickx. and some physiological parameters affecting the impact of treatment on seedling growth were investigated. Following foliar application of 4.5 mmol·L–1 MeJA, disease resistance was greatest 1–2 weeks after treatment and declined with time thereafter. Elevated disease resistance was accompanied by a reduction in seedling growth rate the second week following MeJA treatment. Thereafter, seedling growth rate recovered and exceeded that of the control seedlings 4–5 weeks after MeJA treatment. Within hours of MeJA treatment, reductions in both the capacity of photosystem II and transpiration rate were observed, resulting in a concomitant reduction in net CO2 uptake rate. The slight reduction in transpiration rate was also associated with an increase in needle water potential. Longer term measurements showed no effect of MeJA on photosynthetic rate, transpiration rate, chlorophyll content, or shoot water potential and thus could not account for the elevated growth rate observed 4–5 weeks after treatment.

scholarly journals Vigour evaluation of cocksfoot (Dactylis glomerata) seeds of different age

2013 ◽  
Vol 42 (1-2) ◽  
pp. 23-33
Author(s):  
Ryszard J. Górecki ◽  
Dorota Mierzejewska ◽  
Jan Kaszuba ◽  
Stanisław Grzesiuk ◽  
Andrzej Rejowski
Keyword(s):  
Growth Rate ◽  
Osmotic Stress ◽  
Seedling Growth ◽  
Dactylis Glomerata ◽  
Natural Ageing ◽  
Stress Tests ◽  
Seed Vigour ◽  
Seedling Growth Rate ◽  
Field Emergence

Cocksfoot seeds cv. Baza and Bepro, harvested in 1986, 1985, 1984, and 1983 and stored in a store-house were studied. Seed lots did not differ greatly in their viability. However, significant reduction in seed vigour due to natural ageing as measured by soil emergence, seedling growth rate, and ethanol and osmotic stress tests was noted. A conductivity test did not indicate vigour changes of ageing seeds, and its correlation with field emergence was poor. The methodical aspects of vigour evaluation of cocksfoot seeds are discussed.

scholarly journals The vigour of timothy (Phleum pratense L.) seeds stored up to 5 years

2014 ◽  
Vol 58 (2) ◽  
pp. 263-272 ◽  
Author(s):  
Ryszard J. Górecki ◽  
Dorota Mierzejewska
Keyword(s):  
Growth Rate ◽  
Osmotic Stress ◽  
Seedling Growth ◽  
Stress Test ◽  
Seed Viability ◽  
Phleum Pratense ◽  
Accelerated Ageing ◽  
Ambient Conditions ◽  
Rate Analysis ◽  
Seedling Growth Rate

The viability and vigour of timothy seeds from the 1982, 1983, 1984, 1985 and 1986 harvests, stored in a store-house under ambient conditions were studied. During five years of storage, seed viability dropped from 90-95% to below 15%. The greatest fall in viability occurred between the 4th and 5th year of storage. Seed viability loss was accompanied by rapid vigour degradation as indicated by soil emergence, seedling growth rate analysis, osmotic stress, ethanol, and accelerated ageing (AA-test) tests. The conductivity test was not useful in timothy vigour examination. The highest correlation coefficients between vigour tests and field emergence were obtained for the seedling growth rate analysis and osmotic stress test.

scholarly journals Seedling Growth Rate of 3 Subspecies of Big Sagebrush

1990 ◽  
Vol 43 (5) ◽  
pp. 432 ◽  
Author(s):  
Gordon D. Booth ◽  
Bruce L. Welch ◽  
Tracy L. C. Jacobson
Keyword(s):  
Growth Rate ◽  
Seedling Growth ◽  
Big Sagebrush ◽  
Seedling Growth Rate

Seedling growth rate and survival do not predict invasiveness in naturalized woody plants in New Zealand

Oikos ◽  
2004 ◽  
Vol 106 (2) ◽  
pp. 308-316 ◽  
Author(s):  
P. J. Bellingham ◽  
R. P. Duncan ◽  
W. G. Lee ◽  
R. P. Buxton
Keyword(s):  
Growth Rate ◽  
New Zealand ◽  
Seedling Growth ◽  
Woody Plants ◽  
Seedling Growth Rate

scholarly journals The effect of strong microwave electric field radiation on: (1) vegetable seed germination and seedling growth rate

2013 ◽  
Vol 100 (2) ◽  
pp. 179-184 ◽  
Author(s):  
Audrius Radzevičius ◽  
Sandra Sakalauskienė ◽  
Mindaugas Dagys ◽  
Rimantas Simniškis ◽  
Rasa Karklelienė ◽  
...  
Keyword(s):  
Growth Rate ◽  
Seed Germination ◽  
Electric Field ◽  
Seedling Growth ◽  
Vegetable Seed ◽  
Seedling Growth Rate ◽  
Field Radiation

Collection Age and Seed Mass Influence Germination and Seedling Growth in Midwestern White Spruce Accessions

2021 ◽  
Author(s):  
Brian M Connolly
Keyword(s):  
Growth Rate ◽  
Seedling Growth ◽  
Seed Mass ◽  
Seed Viability ◽  
Germplasm Conservation ◽  
White Spruce ◽  
Seedling Vigor ◽  
Nursery Production ◽  
Seedling Growth Rate ◽  
Unites States

Abstract Stored tree seed collections are essential resources for seedling production and conserving unique germplasm. As stored seeds age, however, seed viability and seedling vigor can decline. This study tests how age and seed mass correspond to germination dynamics and seedling vigor in four white spruce collections from the upper midwestern Unites States. Using two seedling growth experiments, this study demonstrates that white spruce seeds stored for >30 years have low seed viability and slower seedling growth rates compared with seeds from more recent (≤10 years) white spruce collections. Seed mass also predicted seedling growth rate regardless of collection age, suggesting larger seeds from older collections generate faster growing seedlings. Study Implications: Efficient use of stored tree seeds saves nursery managers time and resources. White spruce is a collection priority, but management needs to know how seed viability and seedling vigor decline during storage. Diminished germination and seedling growth after >30 years in storage suggests older collections are most appropriate for germplasm conservation and underscore the importance of testing stored seed prior to nursery production. For collections stored <10 years, larger seeds germinate more readily than smaller seeds and produce faster growing seedlings. For older collections, seed mass does not correspond with germination, but seedling growth rate positively correlated with seed mass.

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