scholarly journals Rapid temperature responses of photosystem II efficiency forecast genotypic variation in rice vegetative heat tolerance

2020 ◽  
Vol 104 (3) ◽  
pp. 839-855
Author(s):  
John N. Ferguson ◽  
Lorna McAusland ◽  
Kellie E. Smith ◽  
Adam H. Price ◽  
Zoe A. Wilson ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Heat Tolerance ◽  
Genotypic Variation ◽  
Photosystem Ii Efficiency ◽  
Rapid Temperature ◽  
Temperature Responses

scholarly journals Wheat photosystem II heat tolerance responds dynamically to short and long-term warming

2021 ◽  
Author(s):  
Bradley C Posch ◽  
Julia Hammer ◽  
Owen K Atkin ◽  
Helen Bramley ◽  
Yong-Ling Ruan ◽  
...  
Keyword(s):  
Heat Stress ◽  
Photosystem Ii ◽  
Heat Tolerance ◽  
Genotypic Variation ◽  
Tolerance Analysis ◽  
Grain Filling ◽  
Intraspecies Variation ◽  
Interspecies Variation ◽  
Key Factor ◽  
High Throughput Phenotyping

Heat-induced inhibition of photosynthesis is a key factor in declining wheat performance and yield. Variation in wheat heat tolerance can be characterised using the critical temperature (Tcrit) above which incipient damage to the photosynthetic machinery occurs. We investigated intraspecies variation and plasticity of wheat Tcrit under elevated temperature in field and controlled environment experiments. We also assessed whether intraspecies variation in wheat Tcrit mirrors patterns of global interspecies variation in heat tolerance reported for mostly wild, woody plants. In the field, wheat Tcrit varied through the course of a day, peaking at noon and lowest at sunrise, and increased as plants developed from heading to anthesis and grain filling. Under controlled temperature conditions, heat stress (36°C) was associated with a rapid rise in wheat Tcrit (i.e. within two hours of heat stress) that peaked after 3—4 days. These peaks in Tcrit indicate a physiological limitation to photosystem II heat tolerance. Analysis of a global dataset (comprising 183 Triticum and wild wheat (Aegilops) species) generated from the current study and a systematic literature review showed that wheat leaf Tcrit varied by up to 20°C (about two-thirds of reported global plant interspecies variation). However, unlike global patterns of interspecies Tcrit variation which has been linked to latitude of genotype origin, intraspecific variation in wheat Tcrit was unrelated to that. Yet, the observed genotypic variation and plasticity of wheat Tcrit suggests that this trait could be a useful tool for high-throughput phenotyping of wheat photosynthetic heat tolerance.

scholarly journals Exploring high temperature responses of photosynthesis and respiration to improve heat tolerance in wheat

2019 ◽  
Vol 70 (19) ◽  
pp. 5051-5069 ◽  
Author(s):  
Bradley C Posch ◽  
Buddhima C Kariyawasam ◽  
Helen Bramley ◽  
Onoriode Coast ◽  
Richard A Richards ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Tolerance ◽  
Yield Losses ◽  
Warming Climate ◽  
Temperature Responses ◽  
Photosynthesis And Respiration

The high temperature responses of photosynthesis and respiration in wheat are an underexamined, yet potential avenue to improving heat tolerance and avoiding yield losses in a warming climate.

Involvement of sulfoquinovosyl diacylglycerol in the structural integrity and heat-tolerance of photosystem II

Planta ◽  
2003 ◽  
Vol 217 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Norihiro Sato ◽  
Motohide Aoki ◽  
Yukihiro Maru ◽  
Kintake Sonoike ◽  
Ayumi Minoda ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Heat Tolerance ◽  
Structural Integrity ◽  
Sulfoquinovosyl Diacylglycerol

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

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.

An experimental study of heat tolerance of cattle

1956 ◽  
Vol 7 (5) ◽  
pp. 469 ◽  
Author(s):  
DF Dowling
Keyword(s):  
Experimental Study ◽  
Heat Stress ◽  
Heat Tolerance ◽  
Rectal Temperature ◽  
Tolerance Test ◽  
The Body ◽  
Normal Body Temperature ◽  
Factors Influencing ◽  
Major Factors ◽  
Temperature Responses

The ability of cattle to maintain a normal body temperature in a dry, hot, inland Australian environment is associated with their ability to dissipate excess heat from the body. A heat tolerance test, based on rectal temperature responses after exercise, is reported. This test indicates the animal's capacity to lose heat. Forty animals, classified on their coat covering, were included in the experiments described. The differences in coat covering are described and associated with differences in rectal temperature under various forms of heat stress. The results serve to illustrate the basic weaknesses of any field test (or hot-room test) which cannot be carried out under conditions where major factors influencing the "adaptability" and type of coat can be kept uniform for all animals tested.

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