scholarly journals Frost tolerance, regeneration capacity after frost exposure and high photosystem II efficiency during winter and early spring support high winter survival in Juncus spp.

Weed Research ◽  
2017 ◽  
Vol 58 (1) ◽  
pp. 25-34 ◽  
Author(s):  
L Østrem ◽  
J Folkestad ◽  
K A Solhaug ◽  
L O Brandsaeter
Keyword(s):  
Photosystem Ii ◽  
Frost Tolerance ◽  
Early Spring ◽  
Winter Survival ◽  
Regeneration Capacity ◽  
Photosystem Ii Efficiency ◽  
Spring Support

Light response of D1 turnover and photosystem II efficiency in the seagrassZostera capricorni

Planta ◽  
1996 ◽  
Vol 198 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Yvette S. Flanigan ◽  
Christa Critchley
Keyword(s):  
Photosystem Ii ◽  
Light Response ◽  
Photosystem Ii Efficiency ◽  
D1 Turnover

Winter Survival and Territory Acquisition in a Northern Population of Black-Capped Chickadees

The Auk ◽  
1988 ◽  
Vol 105 (4) ◽  
pp. 727-736 ◽  
Author(s):  
André Desrochers ◽  
Susan J. Hannon ◽  
Kelly E. Nordin
Keyword(s):  
Survival Rates ◽  
Early Spring ◽  
Control Area ◽  
Winter Survival ◽  
Food Supplementation ◽  
First Year ◽  
Differential Survival ◽  
Northern Population ◽  
Parus Atricapillus ◽  
Lower Ranking

Abstract We assessed the effects of winter food supplementation on differential survival between sex, age and dominance classes, and the effects of feeding and territorial defense on breeding density in a northern population of Black-capped Chickadees (Parus atricapillus). Survival rates were higher in a food-supplemented area than in a control area, which suggests that food abundance limited winter survival. Survival was greater among males than lower-ranking females in 1 of 2 years, and greater in dominants than in subordinates, within sex and age classes. Survival of adults and first-year birds, however, did not differ significantly. In the 2 years of this study, a sharp decline of population size occurred at the onset of territoriality in spring. Birds that disappeared in spring were mainly subordinates of each sex. Breeding densities in control and feeder areas were similar in the two years. Eight of 14 territorial birds removed in 2 years were replaced, implying that a nonbreeding surplus was present in early spring.

Reduction in photosystem II efficiency during a virus-controlled Emiliania huxleyi bloom

2014 ◽  
Vol 495 ◽  
pp. 65-76 ◽  
Author(s):  
SA Kimmance ◽  
MJ Allen ◽  
A Pagarete ◽  
J Martínez Martínez ◽  
WH Wilson
Keyword(s):  
Photosystem Ii ◽  
Emiliania Huxleyi ◽  
Photosystem Ii Efficiency

Photosynthesis, quenching of chlorophyll fluorescence and thermal energy dissipation in iron-deficient sugar beet leaves

1998 ◽  
Vol 25 (4) ◽  
pp. 403 ◽  
Author(s):  
Fermín Morales ◽  
Anunciación Abadía ◽  
Javier Abadía
Keyword(s):  
Energy Dissipation ◽  
Iron Deficiency ◽  
Photosystem Ii ◽  
Sugar Beet ◽  
Electron Flow ◽  
Reaction Centers ◽  
O2 Evolution ◽  
Photosystem Ii Efficiency ◽  
Iron Deficient ◽  
Additional Support

In sugar beet (Beta vulgaris L.) iron deficiency decreased not only the photosynthetic rate but also the actual photosystem II efficiency at steady-state photosynthesis. In moderate iron deficiency, the decrease in actual photosystem II efficiency under illumination was related to closure of photosystem II reaction centers, whereas in severe iron deficiency it was associated to decreases of intrinsic photosystem II efficiency. The O2 evolution, on an absorbed light basis, decreased more than the actual photosystem II efficiency, suggesting the presence of a significant fraction of electron transport to molecular oxygen or the existence of some form of cyclic electron flow. Iron-deficient leaves reduced the excess of light absorbed that cannot be used in photosynthesis not only by decreasing absorptance, but also by dissipating a large part of the light absorbed by the photosystem II antenna. This mechanism, that protects the photosystem II reaction centers through the enhancement of energy dissipation, was related to the de-epoxidation of violaxanthin (V) to antheraxanthin (A) and zeaxanthin (Z) in iron-deficient leaves. These data provide additional support for a role of Z+A in photoprotection under conditions of excess photosynthetic light absorption.

Heat stress and recovery of photosystem II efficiency in wheat (Triticum aestivum L.) cultivars acclimated to different growth temperatures

2014 ◽  
Vol 99 ◽  
pp. 1-8 ◽  
Author(s):  
Mohammad Sabibul Haque ◽  
Katrine Heinsvig Kjaer ◽  
Eva Rosenqvist ◽  
Dew Kumari Sharma ◽  
Carl-Otto Ottosen
Keyword(s):  
Triticum Aestivum ◽  
Heat Stress ◽  
Photosystem Ii ◽  
Triticum Aestivum L ◽  
Photosystem Ii Efficiency

scholarly journals Light spectra trigger divergent gene expression in barley cultivars

2021 ◽  
Author(s):  
Arantxa Monteagudo ◽  
Álvaro Rodríguez del Río ◽  
Bruno Contreras-Moreira ◽  
Tibor Kiss ◽  
Marianna Mayer ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Light Quality ◽  
Frost Tolerance ◽  
Early Spring ◽  
Plant Responses ◽  
Genotypic Differences ◽  
Light Sources ◽  
Diverse Range ◽  
Barley Cultivars ◽  
Light Spectra

AbstractLight spectra influence barley development, causing a diverse range of responses among cultivars that are poorly understood. Here, we exposed three barley genotypes with different light sensitivities to two light sources: fluorescent bulbs, over-representing green and red wavebands, and metal halide lamps, with a more balanced spectrum. We used RNA sequencing to identify the main genes and pathways involved in the different responses, and RT-qPCR to validate the expression values. Different grades of sensitivity to light spectra were associated with transcriptional reprogramming, plastid signals, and photosynthesis. The genotypes were especially divergent in the expression of genes regulated by transcription factors from MADS-box, WRKY, and NAC families, and in specific photoreceptors such as phytochromes and cryptochromes. Variations in light spectra also affected the expression of circadian clock, flowering time, and frost tolerance genes, among others, resembling plant responses to temperature. The relation between PPD-H1, HvVRN1, and HvFT1 expression might explain genotypic differences. Light-sensitive genotypes experienced a partial reversion of the vernalization process and senescence-related stress under the less favorable light quality conditions. The observed light-quality sensitivities reveal a complex mechanism of adaptation to regions with specific light quality features and/or possible regulation of light spectra in plant development during early spring.HighlightDevelopment genes were affected by light quality in the barley varieties tested. Different grades of sensitivity were related to the expression of transcription factors, senescence, light signaling and cold-regulated genes.

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